各种螺纹详细参数和钻孔直径对照表
公制螺纹钻底孔用钻头直径尺寸表
公制螺纹钻底孔用钻头直径尺寸表M1:粗扣螺距0.25＝Φ0.75 细扣螺距0.2＝Φ0.8M2:粗扣螺距0.4＝Φ1.6 细扣螺距0.25＝Φ1.8M3:粗扣螺距0.5＝Φ2.5 细扣螺距0.35＝Φ2.7M4:粗扣螺距0.7＝Φ3.3 细扣螺距0.5＝Φ3.5M5:粗扣螺距0.8＝Φ4.2 细扣螺距0.5＝Φ4.5M6:粗扣螺距1.0＝Φ5.0 细扣螺距0.75＝Φ5.2M8:粗扣螺距1.25＝Φ6.7 细扣螺距1.0 , 0.75＝Φ7,Φ7.2M10:粗扣螺距1.5＝Φ8.5 细扣螺距1.25 , 1.0 , 0.75＝Φ8.7,Φ9,Φ9.2M12:粗扣螺距1.75＝Φ10.2 细扣螺距1.5 , 1.25 , 1.0＝Φ10.5,Φ10.7,Φ11 M14:粗扣螺距2.0＝Φ11.9 细扣螺距1.5 , 1.25 , 1.0＝Φ12.5,Φ12.7,Φ13 M16:粗扣螺距2.0＝Φ14 细扣螺距1.5 , 1.0＝Φ14.5,Φ15M18:粗扣螺距2.5＝Φ15.4 细扣螺距2.0 ,1.5 ,1.0＝Φ15.9,Φ16.5,Φ17M20:粗扣螺距2.5＝Φ17.4 细扣螺距2.0 , 1.5 , 1.0＝Φ17.9,Φ18.5,Φ19M22:粗扣螺距2.5＝Φ19.5 细扣螺距2.0 , 1.5 , 1.0＝Φ19.9,Φ20.5,Φ21M24:粗扣螺距3.0＝Φ20.9 细扣螺距2.0 , 1.5 , 1.0＝Φ21.9,Φ22.5,Φ23生产中钻螺纹底孔公式：t＜1mm: Dz=d-tt＞1mm: Dz=d-(1.04~1.06)t式中 t 螺距（毫米）Dz 攻丝前钻头直径（毫米）d 螺纹公称直径（毫米）公制螺纹钻底孔用钻头直径尺寸表公称直径d 螺距t 钻头直径公称直径d 螺距t 公称直径dM1 粗 0.25 =0.75 M2 粗 0.4 =1.6细 0.2 =0.8 细 0.25 =1.75M3 粗 0.5 =2.5 M4 粗 0.7= 3.3细 0.35 =2.65 细 0.5 =3.5M5 粗 0.8 =4.2 M6 粗 1.0 =5.0细 0.5 =4.5 细 0.75 =5.2M8 粗 1.25 =6.7 M10 粗 1.5 =8.5细 1.0 =7.0 细 1.25 =8.7细 0.75 =7.2 细 1.0 =9.0细 0.75 =9.2M12 粗 1.75 =10.2 M14 粗 2.0 =11.9细 1.5 =10.5 细 1.5 =12.5细 1.25 =10.7 细 1.25 =12.7细 1.0 =11.0 细 1.0 =13.0M16 粗 2.0 =13.9 M18 粗 2.5 =15.4 细 1.5 =14.5 细 2.0 =15.9 细 1.0 =15.0 细 1.5 =16.5 细 1.0 =17.0M20 粗 2.5 =17.4 M22 粗 2.5 =19.4 细 2.0 =17.9 细 2.0 =19.9 细 1.5 =18.5 细 1.5 =20.5 细 1.0 =19.0 细 1.0 =21.0M24 粗 3.0 =20.9 M27 粗 3.0 =23.9 细 2.0 =21.9 细 2.0 =24.9 细 1.5 =22.5 细 1.5 =25.5 细 1.0 =23.0 细 1.0 =26.0M30 粗 3.5 =26.3 M33 粗 3.5 =29.3 细 3.0 =26.9 细 3.0 =29.9 细 2.0 =27.9 细 2.0 =30.9 细 1.5 =28.5 细 1.5 =31.5 细 1.0 =29.0M36 粗 4.0 =31.8 M39 粗 4.0 =34.8 细 3.0 =32.9 细 3.0 =35.9 细 2.0 =33.9 细 2.0 =36.9 细 1.5 =34.5 细 1.5 =37.5M42 粗 4.5 =37.3 M45 粗 4.5 =40.3 细 4.0 =37.8 细 4.0 =40.8 细 3.0 =38.9 细 3.0 =41.9 细 2.0 =39.9 细 2.0 =42.9 细 1.5 =40.5 细 1.5 =43.5M48 粗 5.0 =42.7 M52 粗 5.0 =46.7 细 4.0 =43.8 细 4.0 =47.8 细 3.0 =44.9 细 3.0 =48.9 细 2.0 =45.9 细 2.0 =49.9 细 1.5 =46.5 细 1.5 =50.5欢迎您的下载，资料仅供参考！致力为企业和个人提供合同协议，策划案计划书，学习资料等等打造全网一站式需求。
螺纹攻牙-钻孔直径对照表
36.00 36.271 35.814
公制迫牙丝攻钻孔径(挤压丝锥)
规格
精度等级
G1-G6 G7-G8
G9
M1.0*0.25
0.86 0.88 螺孔小径..
M1.1*0.25
0.96 0.98
..
M1.2*0.251.06源自1.08..M1.4*0.3
1.24 1.25
..
M1.6*0.35
1.41 1.43
M27*1.0
26.00 26.153 25.917
M18*2.5 15.50 15.744 15.294
M28*2.0
26.00 26.210 25.835
M20*2.5 17.50 17.744 17.294
M28*1.5
26.50 26.676 26.376
M22*2.5 19.50 19.744 19.294
M33*3.0
30.00 30.252 29.752
M1.1*0.2 0.90 0.921 0.883
M33*2.0
31.00 31.210 30.835
M1.2*0.2 1.00 1.021 0.983
M33*1.5
31.50 31.676 31.376
M1.4*0.2 1.20 1.221 1.183
M5.5*0.5 5.00 5.099 4.959 NO.6-40(3.505) 2.90 3.022 2.820
M6.0*0.75 5.30 5.378 5.188 NO.8-36(4.166) 3.50 3.606 3.404
M6.0*0.5 5.50 5.550 5.400 NO.10-32(4.826) 4.10 4.165 3.963
常用螺丝攻牙前钻孔直径对照表
各种螺纹详细参数和钻孔直径对照表
19/64
15/32
11/4
115/32
131/64
11/2
11/2
11/16
123/32
13/4
2
211/64
23/16
27/32
21/2
239/64
239/64
221/32
上述钻头直径來源於美制管用螺纹ANSI／ASME —1983 Pipe Threads, General Purpose (Inch)標準
7
~ (100~80)
14×2
6
~ (100~90)
10
~ (100~85)
14×
5
~ (100~90)
9
~ (100~85)
16×2
6
~ (100~90)
10
~ (100~85)
16×
5
~ (100~90)
9
~ (100~80)
18×
6
~ (100~90)
11
~ (100~85)
18×
6
~ (100~90)
45 × 4
41
(90%)
45 × 3
42
(85%)
45 × 2
43
(85%)
45 ×
(85%)
48 × 4
44
(90%)
48 × 3
45
(85%)
48 × 2
46
(85%)
48 ×
(85%)
50 × 3
47
(85%)
50 × 2
48
(85%)
50 ×
(85%)
註(1)等級：6H
(2)基於JIS B 0211-1982標準
常用管螺纹底孔及深度对照表
RC 1/8" 1/4" 3/8" 1/2" 3/4" 1" 1+1/4" 1+1/2"
2
NPT 1/8" 1/4" 3/8" 1/2" 3/4" 1" 1+1/4" 1+1/2"
2
锥管螺纹钻底孔直径及检验方法
螺纹深度
检验用具
螺纹深度
检验用具
7
管接头
12
堵头
10
管接头
14
堵头
11
管接头
15
堵头
14
管接头
检验用具 堵头 堵头 堵头 堵头 堵头 堵头 堵头 堵头 堵头
钻孔直径 Φ8.2 Φ11 Φ14.5 Φ18 Φ23 Φ29 Φ38 Φ44 Φ55
钻孔直径 Φ8.5 Φ11 Φ14.5 Φ18 Φ23 Φ29 Φ38 Φ44 Φ56
要求： 堵头孔要求堵头拧紧后端面低于外平面1mm左右； 管接头孔要求管接头拧紧后有2-3牙路在外面；
18
堵头
15
管接头
20
堵头
18
管接头
25
堵头
20
管接头
30
堵头
22
管5
堵头
锥管螺纹钻底孔直径及检验方法
螺纹深度 7 10 11 14 15 18 20 22 25
检验用具 管接头 管接头 管接头 管接头 管接头 管接头 管接头 管接头 管接头
螺纹深度 12 14 15 18 20 25 30 32 35
常用螺纹代号及钻头直径
常用螺纹代号及钻头直径常用螺纹代号及钻头直径1、普通标准公制内螺纹底孔直径计算方法代号：M底孔直径d：D-T*1.0825例：M30d=30-3.5*1.0825=26.21（最小）2、普通细牙螺纹内螺纹底孔直径计算方法代号：M*T底孔直径d：D-T*1.0825例：M30*2d=30-2*1.0825=27.84（最小）3、圆柱管螺纹底孔直径尺寸表代号：G牙型角：55°公称直径（英寸）每寸牙数钻头直径（mm）公称直径（英寸）每寸牙数底孔直径（mm）1/8288.6~8.811130.3~30.51/41911.5~11.711/81135~35.23/81915~15.211/41139~39.21/21418.6~18.913/81141.4~41.65/81420.6~20.811/21144.9~45.13/41424.1~24.313/41150.8~517/81427.9~28.121156.7~57 4、圆锥管螺纹底孔直径尺寸表1)、55°圆锥管螺纹代号：KG、ZG、RC（内）、R（外）牙型角：55°锥度=1:16斜角=1°47′24″公称直径每寸牙数有效长度基面长度基面外径底孔直径1/8289 4.59.7298.2701/41911613.15811.073/81912616.66314.5761/214157.520.95618.163/414179.526.44223.525111191133.25029.6111/411221341.91238.14111/211231447.80543.972211261659.61655.659 2)、60°圆锥管螺纹代号：Z、K、NPT牙型角：60°锥度=1:16斜角=1°47′24″公称直径每寸牙数有效长度基面长度基面外径底孔直径1/1627 6.5 4.0647.895 6.1351/8277 4.57210.2728.4801/4189.5 5.08013.57210.9963/81810.5 6.09617.05514.4161/21413.58.12821.22317.813/414148.61126.56823.128111.517.510.16033.22829.05911/411.51810.66841.95837.78411/211.518.510.66848.05443.853211.51911.07460.09255.866审核：制表：。
螺纹底孔与攻牙后的孔径对照表
塑性材料钻孔直径D=d(螺纹外径)-p（螺距）
除了以上的经验公司外,还要考虑螺纹的公差等级.
普通公制螺纹用外径-螺距。记这个最直观
螺纹外径计算方法(2009/09/06 19:48)
公制螺纹(MM牙)
牙深=0.6495*牙距P
(牙角60度)
内牙孔径=
M24 Φ21
M27 Φ24
M30 Φ26.5
螺纹钻孔底径计算
一般按下列公式：
1.攻公制螺纹：螺距t<1毫米，dz=d-t
t＞1毫米，dz=d-（1.04～1.06)t
式中t——螺距（毫米）
dz——攻丝前钻孔直径（毫米）
d——螺纹公称直径（毫米）
2.攻英制螺纹：
螺纹公称直径铸铁与青铜钢与黄铜
3/16"～5/8" dz＝25（d-1/n) dz＝25（d-1/n)+0.1
(牙角55度)
PT 3/4-14 (锥度管螺纹)锥度管螺纹,锥度比1/16
3/4英吋管用,每英吋14牙
管螺纹
(PS直螺纹)(PF细牙)
牙深=
0.6403*(25.4/每吋牙数)
(牙角55度)
PS 3/4-14 (直形管螺纹)
PF1 1/8-16 (直形管螺纹)
(细牙)
直形管螺纹
3/4英吋管用,每英吋14牙
3/4"～11/2" dz＝25（d-1/n) dz＝25（d-1/n) +0.2
式中dz——攻丝前钻孔直径（毫米）
d——螺纹公称直径（英寸）
n——每英寸牙数
首先，要知道螺纹的外径D,螺距T,螺纹底孔直径d=D-T。
常用粗牙公制螺纹钻底孔尺寸对应表。一般情况等于外径-螺距
以下是常用粗牙公制螺纹钻底孔尺寸对应表。
一般情况等于外径-螺距M1 Φ0.75M2 Φ1.6M3 Φ2.5M4 Φ3.3M5 Φ4.2M6 Φ5M8 Φ6.75M10 Φ8.5M12 Φ10.25M14 Φ12M16 Φ14M18 Φ15.5M20 Φ17.5M22 Φ19.5M24 Φ21M27 Φ24M30 Φ26.5螺纹钻孔底径计算一般按下列公式：1.攻公制螺纹：螺距t<1毫米，dz=d-tt＞1毫米，dz=d-（1.04～1.06)t式中t——螺距（毫米）dz——攻丝前钻孔直径（毫米）d——螺纹公称直径（毫米）2.攻英制螺纹：螺纹公称直径铸铁与青铜钢与黄铜3/16"～5/8" dz＝25（d-1/n) dz＝25（d-1/n)+0.1 3/4"～11/2" dz＝25（d-1/n) dz＝25（d-1/n) +0.2式中dz——攻丝前钻孔直径（毫米）d——螺纹公称直径（英寸）n——每英寸牙数首先，要知道螺纹的外径D,螺距T,螺纹底孔直径d=D-T。
攻螺纹前钻底孔直径和深度的确定以及孔口的倒角（1）底孔直径的确定丝锥在攻螺纹的过程中，切削刃主要是切削金属，但还有挤压金属的作用，因而造成金属凸起并向牙尖流动的现象，所以攻螺纹前，钻削的孔径（即底孔）应大于螺纹内径。
底孔的直径可查手册或按下面的经验公式计算：脆性材料（铸铁、青铜等）：钻孔直径d0=d(螺纹外径)-1.1p（螺距）塑性材料（钢、紫铜等）：钻孔直径d0=d(螺纹外径)-p（螺距）（2）钻孔深度的确定攻盲孔（不通孔）的螺纹时，因丝锥不能攻到底，所以孔的深度要大于螺纹的长度，盲孔的深度可按下面的公式计算：孔的深度=所需螺纹的深度+0.7d普通螺纹底孔直径简单计算可按下式要攻丝的尺寸乘上0.85如：M3--2.4mmM4--3.1mmM5--4.2mM6--5.1mmM8--6.8mm公制螺纹的计算方法：底径=大径-1.0825*螺距英制螺纹的计算方法：底径=大径-1.28*螺距脆性材料钻孔直径D=d(螺纹外径)-1.1p（螺距）塑性材料钻孔直径D=d(螺纹外径)-p（螺距）除了以上的经验公司外,还要考虑螺纹的公差等级.普通公制螺纹用外径-螺距。
各种螺纹详细参数和钻孔直径对照表
螺纹下孔径表公制粗牙螺纹 JIS B 0209-1982(單位：mm)註(1)以下等級：5H、以上等級：6H(2)基於JIS B 0209-1982標準螺纹下孔径表螺纹下孔径表註(1)等級：6H(2)基於JIS B 0211-1982標準螺纹下孔径表美制粗牙螺纹 (單位：mm)螺纹下孔径表美制細牙螺纹 (單位：mm)螺纹下孔径表英制粗牙螺纹(單位：mm)螺纹下孔径表英制管用螺纹 (單位：mm)螺纹下孔径表美制斜行管用螺纹 (NPT‧NPS) (單位：mm)上述钻头直径來源於美制管用螺纹ANSI／ASME —1983 Pipe Threads, General Purpose (Inch)標準。
螺纹下孔径表美制管用耐密斜行螺纹(NPTF‧NPSF) (單位：mm)上述钻头直径來源於美制管用耐密斜行螺纹ANSI —1957 Dryseal Pipe Threads (Inch)標準。
螺纹下孔径表(無屑絲攻用)公制螺纹(NRT) (單位：mm)螺纹下孔径表(無屑絲攻用)美制粗牙螺纹(NRT) (單位：mm)螺纹下孔径表(無屑絲攻用)美制細牙螺纹(NRT) (單位：mm)英制管用平行螺纹(NRT) (單位：mm)螺纹下孔径表(無屑絲攻用)公制螺纹(HRT) (單位：mm)螺纹下孔径表(護套螺纹用)公制粗牙螺纹 HL-NRT (單位：mm)螺纹下孔径表(護套螺纹用)公制粗牙螺纹 (單位：mm)公制細牙螺纹 (單位：mm)螺纹下孔径表(護套螺纹用)美制粗牙螺纹 (單位：mm)各 種 換 算 表山數節距換算表管用螺絲基準寸法(mm)。
超全螺纹攻牙钻孔直径和滚造直径对照表,值得收藏!
M17×1.0
16.00
16.153
15.917
M18×2.0
16.00
16.210
15.835
M18×1.5
16.50
16.670
16.376
M18×1.0
17.00
17.153
16.917
M20×2.0
18.00
18.210
17.835
M20×1.5
18.50
18.676
18.376
39.50
39.827
38.964
2 -4-1/2
45.20
45.593
44.679
英制螺纹
规格
钻孔径
硬材
软材
W1/8 - 40
2.65
2.60
W5/32 - 32
3.25
3.20
W3/16 - 24
3.75
3.70
W1/4 - 20
11.938
11.709
9/16 -28
13.20
13.386
13.132
5/8 -24
14.80
14.986
14.732
3/4 -20
17.80
17.958
17.678
7/8 -20
21.00
21.133
20.853
1 -20
24.00
24.308
24.028
美 制 粗 螺 纹
规格(UNC)
标准径
1.40
1.421
1.383
M1.7×0.2
1.45
1.500
1.460
M1.8×0.2
1.60
螺丝攻牙钻孔径和滚丝径对照表
螺丝攻牙钻孔径和滚丝径对照表螺丝攻牙钻孔径和滚丝径对照表公制粗螺纹美制粗螺纹规格标准径2级牙钻孔径规格（UNC）标准径2级牙钻孔径最大最小最大最小M1.0×0.25 0.75 0.785 0.729NO.1-64(1.854) 1.55 1.582 1.425M1.1×0.25 0.85 0.885 0.829NO.2-56(2.184) 1.80 1.871 1.695M1.2×0.25 0.95 0.985 0.985NO.3-48(2.515) 2.10 2.146 1.941M1.4×0.3 1.10 1.142 1.075NO.4-40(2.845) 2.30 2.385 2.157M1.6×0.35 1.25 1.321 1.221NO.5-40(3.175) 2.60 2.697 2.487M1.7×0.35 1.35 1.421 1.321NO.6-32(3.505) 2.80 2.895 2.642M1.8×0.35 1.45 1.521 1.421NO8-32(4.166) 3.40 3.53 3.302M2.0×0.4 1.60 1.679 1.567NO.10-24(4.826) 3.90 3.962 3.683M2.2×0.45 1.75 1.838 1.713NO.12-24(5.486) 4.50 4.597 4.344M2.3×0.4 1.90 1.979 1.867 1/4-20 5.10 5.257 4.979M2.5×0.45 2.10 2.138 2.013 5/16-18 6.60 6.731 6.401M2.6×0.45 2.20 2.238 2.113 3/8-16 8.00 8.153 7.798M3.0×0.5 2.50 2.599 2.459 7/16-14 9.40 9.55 9.144M3.0×0.6 2.40 2.440 2.280 1/2-13 10.80 11.023 10.592M3.5×0.6 2.90 3.010 2.850 9/16-12 12.20 12.446 11.989M4.0×0.7 3.30 3.422 3.242 5/8-11 13.60 12.868 13.386M4.0×0.75 3.25 3.326 3.106 3/4-10 16.50 18.840 16.307M4.5×0.75 3.80 3.878 3.688 7/8-9 19.50 19.761 19.177M5.0×0.8 4.20 4.334 4.134 1 22.2022.606 21.971M5.0×0.9 4.10 4.170 3.930 1-1/8-7 25.00 25.349 24.638M6.0×1.0 5.00 5.153 4.917 1-1/4-7 28.20 28.524 27.813M7.0×1.0 6.00 6.153 5.917 1-3/8-6 30.80 31.115 30.353M8.0×1.25 6.80 6.912 6.647 1-1/2-6 34.00 34.290 33.528M9.0×1.25 7.80 7.912 7.647 1-3/4-5 39.50 39.827 38.964M10×1.5 8.50 8.676 8.376 2-4-1/2 45.20 45.593 44.679M11×1.5 9.50 9.676 9.376M12×1.75 10.30 10.441 10.106M14×2.0 12.00 12.210 11.835M16×2.0 14.00 14.210 13.835M18×2.5 15.50 15.744 15.294M20×2.5 17.50 17.744 17.294M22×2.5 19.50 19.744 19.294M24×3.0 21.00 21.252 20.752M27×3.0 24.00 24.252 23.752M30×3.5 26.50 26.771 26.211螺丝攻牙钻孔径和滚丝径对照表公制细螺纹美制细螺纹规格标准径2级牙钻孔径规格（UNC）标准径2级牙钻孔径最大最小最大最小M1.0×0.2 0.80 0.821 0.783 NO.0-80(1.524) 1.25 1.305 1.182M1.1×0.2 0.90 0.921 0.883 NO.1-72(1.854) 1.55 1.612 1.474M1.2×0.2 1.00 1.021 0.983 NO.2-64(2.184) 1.85 1.912 1.756M1.4×0.2 1.20 1.221 1.183 NO.3-56(2.515) 2.10 2.197 2.025M1.6×0.2 1.40 1.421 1.383 NO.4-48(2.845) 2.40 2.458 2.271M1.7×0.2 1.45 1.500 1.460NO.5-44(3.175) 2.70 2.740 2.551M1.8×0.2 1.60 1.621 1.583NO.6-40(3.505) 2.90 3.022 2.820M2.0×0.25 1.75 1.785 1.729NO.8-36(4.166) 3.50 3.606 3.404M2.2×0.25 1.95 1.985 1.929NO.10-32(4.826) 4.10 4.165 3.963M2.3×0.25 2.05 2.061 2.001NO.12-28(5.846) 4.60 4.724 4.496M2.5×0.35 2.20 2.221 2.121 1/4-28 5.50 5.588 5.360M2.6×0.35 2.20 2.246 2.186 5/16-24 6.90 7.035 6.782M3.0×0.35 2.70 2.721 2.621 3/8-24 8.50 8.636 8.382M3.5×0.35 3.20 3.221 3.121 7/16-20 9.90 10.033 9.729M4.0×0.5 3.50 3.599 3.459 1/2-20 11.50 11.607 11.329M4.5×0.5 4.00 4.099 3.959 9/16-18 12.90 13.081 12.751M5.0×0.5 4.50 4.599 4.459 5/8-18 14.50 14.681 14.351M5.5×0.5 5.00 5.099 4.959 3/4-16 17.50 17.678 17.323M6.0×0.75 5.30 5.378 5.188 7/8-14 20.50 20.675 20.270M6.0×0.5 5.50 5.550 5.400 1-12 23.20 23.571 23.114M7.0×0.75 6.30 6.378 6.188 1-1/8-12 26.50 26.746 26.289M7.0×0.5 6.50 6.550 6.400 1-1/4-1229.50 29.921 29.464M8.0×1.0 7.00 7.153 6.917 1-3/8-12 32.80 33.096 32.639M8.0×0.75 7.30 7.378 7.188 1-1/2-12 36.00 36.271 35.814M8.0×0.5 7.50 7.520 7.400M9.0×1.0 8.00 8.153 7.917M9.0×0.75 8.30 8.378 8.188M10×1.25 8.80 8.912 8.647M10×1.0 9.00 9.153 8.917M10×0.75 9.30 9.378 9.188M10×0.5 9.50 9.520 9.400M11×1.0 10.00 10.153 9.917M11×0.75 10.30 10.378 10.188M12×1.5 10.50 10.676 10.376M12×1.25 10.80 10.912 10.647M12×0.5 11.50 11.520 11.400 M14×1.5 12.50 12.676 12.376 M14×1.0 13.00 13.153 12.917 M15×1.5 13.50 13.676 13.376 M15×1.0 14.00 14.153 13.917 M16×1.5 14.50 14.676 14.376 M16×1.0 15.00 15.153 14.917 M17×1.5 15.50 15.676 15.376 M17×1.0 16.00 16.153 15.917 M18×2.0 16.00 16.210 15.835 M18×1.5 16.50 16.676 16.376 M18×1.0 17.00 17.153 16.917 M20×2.0 18.00 18.210 17.835 M20×1.5 18.50 18.676 18.376 M20×1.0 19.00 19.153 18.917 M22×2.0 20.00 20.210 19.835 M22×1.5 20.50 20.676 20.376 M22×1.0 21.00 21.153 20.917M24×1.5 22.50 22.676 22.376 M24×1.0 23.00 23.153 22.917 M25×2.0 23.00 23.210 22.835 M25×1.5 23.50 23.676 23.376 M25×1.0 24.00 24.153 23.917 M26×1.5 24.50 24.676 24.376 M27×2.0 25.00 25.210 24.835 M27×1.5 25.50 25.676 25.376 M27×1.0 26.00 26.153 25.917 M28×2.0 26.00 26.210 25.835 M28×1.5 26.50 26.676 26.376 M28×1.0 27.00 27.153 26.917 M30×3.0 27.00 27.252 26.752 M30×2.0 28.00 28.210 27.835 M30×1.5 28.50 28.676 28.376 M30×1.0 29.00 29.153 28.917 M32×2.0 30.00 30.210 29.835 M32×1.5 30.50 30.676 30.376M33×3.0 30.00 30.252 29.752M33×2.0 31.00 31.210 30.835M33×1.5 31.50 31.676 31.376M35×1.5 33.50 33.676 33.376M36×3.0 33.00 33.252 32.752M36×2.0 34.00 34.210 33.835M36×1.5 34.50 34.676 34.376螺丝攻牙钻孔径和滚丝径对照表公制挤压丝攻钻孔径美制挤压丝攻钻孔径规格精度等级规格（UNC）精度等级G4-G6 G7-G8 G9 G4-G6 G7-G8 G9M1.0×0.25 0.86 0.88 －NO.2-56UNC 1.94 －－M1.1×0.25 0.96 0.98 －NO.3-48 2.23 －－M1.2×0.25 1.06 1.08 －NO.4-40 2.50 －－M1.4×0.3 1.24 1.25 －NO.5-40 2.83 －－M1.6×0.35 1.41 1.43 －NO.6-32 3.07 －－－M1.8×0.35 1.61 1.63 －NO.10-24 4.24 4.3 －M2.0×0.4 1.78 1.80 －NO.12-24 4.90 4.96 －M2.2×0.45 1.95 1.98 －1/4-20 －5.72 －M2.3×0.4 2.08 2.10 －5/16-18 －7.24 －M2.5×0.45 2.25 2.28 －3/8-16 －8.74 8.81 M2.6×0.45 2.35 2.38 －7/16-14 －10.20 10.30M3.0×0.5 2.73 2.75 －1/2-13 －11.27 11.82M3.5×0.6 3.17 3.20 －NO.2-64UNF 1.97－－M4.0×0.7 3.62 3.65 3.69 NO.3-56 2.27 －－M5.0×0.8 4.56 4.60 4.64 NO.4-48 2.56 －－－M7.0×1.0 6.45 6.50 6.55 NO.6-40 3.16 －－M8.0×1.25 7.31 7.38 7.44 NO.8-36 3.78 －－M10×1.5 9.18 9.25 9.32 NO.10-32 4.394.43 －M10×1.25 9.31 9.38 9.44 NO.12-28 4.99 5.04 －M12×1.75 11.04 11.12 11.21 1/4-28 5.85 5.90 －M12×1.25 11.31 11.38 11.44 5/16-24 7.36 7.41 －3/8-24 －9.00 －7/16-20 －10.48 10.541/2-20 －12.07 12.13美制特细螺纹英制电器螺纹规格标准径2级牙钻孔径规格钻孔径最大最小NO.12-32 4.70 4.826 4.623 2BA 4.0-4.2 1/4 -32 5.60 5.690 5.486 3BA5/16 -32 7.10 7.264 7.087 4BA 3.0-3.2 3/8 -32 8.70 8.865 8.661 5BA 2.7-2.8 7/16 -28 10.20 10.338 10.135 6BA 2.4-2.51/2 -28 11.80 11.938 11.7099/16 -24 13.20 13.386 13.1325/8 -24 14.80 14.986 14.7323/4 -20 17.80 17.958 17.6787/8 -20 21.00 21.133 20.8531 -20 24.00 24.308 24.028螺丝攻牙钻孔径和滚丝径对照表英制螺纹公制螺纹针车用螺纹规格(UNEF) 钻孔径规格滚丝径规格滚丝径硬材软材W 1/8 - 40 2.65 2.60 M3×0.5 2.63-2.60SM1/8-40 2.735-2.688W 5/32 - 32 3.25 3.20 M3.0×0.6 2.56-2.53 SM1/8-44 2.769-2.722W 3/16 - 24 3.75 3.70 M3.5×0.6 3.06-3.03 SM9/64-40 3.128-3.083W 1/4 - 20 5.10 5.00 M4.0×0.7 3.49-3.45 SM11/64-40 3.855-3.805W 5/16 - 18 6.60 6.50 M4.0×0.75 3.45-3.41 SM3/16-32 4.205-4.155W 3/8 - 16 8.00 7.90 M4.5×0.75 3.96-3.92 SM3/16-28 4.143-4.093W 7/16 - 14 9.40 9.30 M5.0×0.8 4.43-4.38 SM7/32-32 5.003-4.955W 1/2 - 12 10.70 10.50 M5.0×0.9 4.36-4.31 SM15/64-28 5.325-5.570W 9/16 - 12 12.30 12.00 M6.0×1.05.30-5.25 SM1/4-40 5.890-5.735W 5/8 - 11 13.70 13.50 M7.0×1.0 6.30-6.25 SM1/4-28 5.721-5.366W 3/4 - 10 16.70 16.50 M8.0×1.0 7.28-7.23 SM9/32-28 6.508-6.648W 7/8 - 9 19.50 19.30 M8.0×1.25 7.12-7.07 SM11/32-28 8.092-8.432W1 - 8 22.40 22.00 SM3/8-288.880-8.015W 1-1/8 - 7 25.00 24.80 SM7/16-28 10.466-10.401W 1 - 1/4 - 7 28.30 28.00 SM7/16-16 10.037-9.967SM1/2-20 11.819-11.749SM9/26-20 13.400-13.425英制管螺纹英制管螺纹美制管螺纹规格标准径钻孔径规格标准径有交牙部之长度（最小）中之毋螺牙内径标准长度（最小）中之毋螺牙内径规格钻孔径最大最小使用绞刀时不用绞刀时NPT NPS 使用绞刀时不用绞刀时PS 1/16 - 28 6.50 6.632 6.490 PT 1/16 - 28 6.10 6.20 6.244 6.384 1/16 - 27 6.10 6.25 6.35PS 1/8 - 28 8.50 8.637 8.495 PT 1/8 - 28 8.10 8.20 8.249 8.388 1/8 - 27 8.33 8.43 8.74PS 1/4 - 19 11.40 11.549 11.341 PT 1/4 - 19 10.70 11.00 10.962 11.174 1/4 - 18 10.72 11.13 11.13PS 3/8 - 19 15.00 15.054 14.846 PT 3/8 - 19 14.20 14.50 14.448 14.658 3/8 - 18 14.27 14.27 14.68PS 1/2 - 14 18.50 18.773 18.489 PT 1/2 - 14 17.60 18.00 17.979 18.263 1/2 - 14 17.48 17.86 18.26PS 3/4 -14 24.00 24.259 23.975 PT 3/4 - 14 23.00 23.50 23.378 23.663 3/4 - 14 22.63 23.01 23.42PS 1 - 11 30.20 30.471 30.111 PT 1- 11 29.00 29.50 29.459 29.822 1 - 11-1/2 28.58 28.98 29.36PS 1-1/4 - 11 38.80 39.132 38.772 PT 1-1/4 - 11 37.50 38.00 37.976 38.3391-1/4-11-1/2 37.31 37.69 38.10PS 1-1/2 - 11 44.80 45.025 44.665 PT 1-1/2 - 11 43.40 44.00 43.869 44.2321-1/2-11-1/2 43.66 44.04 44.45PS 2 - 11 56.50 56.836 56.476 PT 2 - 11 54.90 55.50 55.412 55.844 2 - 11 - 1/2 55.58 55.96 56.36。
螺纹孔径对照表1
当之处，应视实际状况适当的变更钻头直径。
本表是依据2级牙制订。
注：迫牙丝攻之钻孔径，在上表所列之数
值，由于被加工 材料之材质、硬度、形状
、尺寸等之影响，多少会有所变动，因此
于参考上表之同时，亦请增减若干。
螺纹攻牙钻孔径和滚造径对照表
本表所推选之钻头孔径，是针对攻牙加工时，能够很容易的了解钻孔直径；而依据市售之标准钻头所选定的。
在使用钻头的情况下，由于钻头的形状及尺寸、精度、被钻孔之材质等，对于所钻孔的尺寸、精度有很大的影响，所以使用本表之钻孔径，若有不。
螺纹攻牙-钻孔直径对照表
M4.5*0.5 4.00 4.099 3.959 NO.4-48(2.845) 2.40 2.458 2.271
M5.0*0.5 4.50 4.599 4.459 NO.5-44(3.175) 2.70 2.740 2.551
M5.5*0.5 5.00 5.099 4.959 NO.6-40(3.505) 2.90 3.022 2.820
5/8 - 18
14.50 14.681 14.351
M10*1.0 9.00 9.153 8.917
3/4 - 16
17.50 17.678 17.323
M10*0.75 9.30 9.378 9.188
7/8 - 14
20.50 20.675 20.270
M10*0.5 9.50 8.520 9.400
M7.0*1.0
6.45 6.50
6.55
M8.0*1.25
7.31 7.38
7.44
M10*1.5
9.18 9.25
9.32
M10*1.25
9.31 9.38
9.44
M12*1.75
11.04 11.12 11.21
M12*1.25
11.31 11.38 11.44
美制迫牙丝攻钻孔径
规格 NO. 2-56UNC
7/16 - 20
9.90 10.033 9.729
M9.0*1.0 8.00 8.153 7.917
1/2 - 20
11.50 11.607 11.329
M9.0*0.75 8.30 8.378 8.188
3/16 - 18
12.90 13.081 12.751
M10*1.25 8.80 8.912 8.647
各种螺纹参数和钻孔直径对照表
螺纹下孔径表公制粗牙螺纹JIS B 0209-1982(單位：mm)螺纹尺寸钻头直径崁合度區分：中(注1)2級(注2)下孔径崁合度區分：中(註1)2級(註2)內螺纹小径最小直径最大直径M1× 0.25 0.75 0.78 (80%) 0.729 0.7851.1 × 0.25 0.85 0.88 (80%) 0.829 0.8851.2 × 0.25 0.95 0.98 (80%) 0.929 0.9851.4 × 0.3 1.1 1.14 (80%) 1.075 1.1421.6 × 0.35 1.25 1.32 (75%) 1.221 1.3211.8 × 0.35 1.45 1.52 (75%) 1.421 1.5212× 0.4 1.6 1.65 (80%) 1.567 1.6792.2 × 0.45 1.75 1.83 (75%) 1.713 1.8382.5 × 0.45 2.1 2.13 (75%) 2.013 2.1383× 0.5 2.5 2.59 (75%) 2.459 2.5993.5 × 0.6 2.9 3.01 (75%) 2.850 3.0104× 0.7 3.3 3.39 (80%) 3.242 3.4224.5 × 0.75 3.8 3.85 (80%) 3.688 3.8785× 0.8 4.2 4.31 (80%) 4.134 4.334 6× 1 5 5.13 (80%) 4.917 5.153 7× 1 6 6.13 (80%) 5.917 6.153 8× 1.25 6.8 6.85 (85%) 6.647 6.912 9× 1.25 7.8 7.85 (85%) 7.647 7.912 10× 1.5 8.5 8.62 (85%) 8.376 8.676 11× 1.5 9.5 9.62 (85%) 9.376 9.676 12× 1.75 10.3 10.40 (85%) 10.106 10.441 14× 2 12 12.2 (85%) 11.835 12.210 16× 2 14 14.2 (85%) 13.835 14.210 18× 2.5 15.5 15.7 (85%) 15.294 15.744 20× 2.5 17.5 17.7 (85%) 17.294 17.744 22× 2.5 19.5 19.2 (85%) 19.294 19.744 24× 3 21 21.2 (85%) 20.752 21.252 27× 3 24 24.2 (85%) 23.752 24.252 30× 3.5 26.5 26.6 (90%) 26.211 26.771 33× 3.5 29.5 29.6 (90%) 29.211 29.771 36× 4 32 32.1 (90%) 31.670 32.27039 × 4 35 35.1 (90%) 34.670 35.27042 × 4.5 37.5 37.6 (90%) 37.129 37.79945 × 4.5 40.5 40.6 (90%) 40.129 40.79948 × 5 43 43.1 (90%) 42.587 43.297 註(1)M1.4以下等級：5H、M1.6以上等級：6H(2)基於JIS B 0209-1982標準螺纹下孔径表公制細牙螺纹JIS B 0211-1982(單位：mm)螺纹尺寸钻头直径崁合度區分：中(注1)2級(注2)下孔径崁合度區分：中(註1)2級(註2)內螺纹小径最小直径最大直径M2.5 × 0.35 2.2 2.22 (75%) 2.121 2.221 3× 0.35 2.7 2.72 (75%) 2.621 2.7213.5 × 0.35 3.2 3.22 (75%) 3.121 3.2214× 0.5 3.5 3.59 (75%) 3.459 3.5994.5 × 0.5 4 4.09 (75%) 3.959 4.0995× 0.5 4.5 4.59 (75%) 4.459 4.5995.5 × 0.5 5 5.09 (75%) 4.959 5.0996× 0.75 5.3 5.35 (80%) 5.188 5.378 7× 0.75 6.3 6.35 (80%) 6.188 6.378 8× 1 7 7.13 (80%) 6.917 7.153 8× 0.75 7.3 7.35 (80%) 7.188 7.378 9× 1 8 8.13 (80%) 7.917 8.153 9× 0.75 8.3 8.35 (80%) 8.188 8.378 10× 1.25 8.8 8.85 (85%) 8.647 8.912 10× 1 9 9.13 (80%) 8.917 9.153 10× 0.75 9.3 9.35 (80%) 9.188 9.378 11 × 1 10 10.13 (80%) 9.917 10.15311 × 0.75 10.3 10.35 (80%) 10.188 10.37812 × 1.5 10.5 10.62 (85%) 10.376 10.676 12 × 1.25 10.8 10.85 (85%) 10.647 10.912 12 × 1 11 11.13 (80%) 10.917 11.153 14 × 1.5 12.5 12.62 (85%) 12.376 12.67614 × 1 13 13.13 (80%) 12.917 13.15315 × 1.5 13.5 13.62 (85%) 13.376 13.67615 × 1 14 14.13 (80%) 13.917 14.15316 × 1.5 14.5 14.62 (85%) 14.376 14.67616 × 1 15 15.13 (80%) 14.917 15.15317 × 1.5 15.5 15.62 (85%) 15.376 15.67617 × 1 16 16.13 (80%) 15.917 16.15318 × 2 16 16.2 (85%) 15.835 16.210 18 × 1.5 16.5 16.62 (85%) 16.376 16.676 18 × 1 17 17.13 (80%) 16.917 17.153 20 × 2 18 18.2 (85%) 17.835 18.210 20 × 1.5 18.5 18.62 (85%) 18.376 18.67622 × 2 20 20.2 (85%) 19.835 20.21022 × 1.5 20.5 20.62 (85%) 20.376 20.67622 × 1 21 21.13 (80%) 20.917 21.15324 × 2 22 22.2 (85%) 21.835 22.21024 × 1.5 22.5 22.62 (85%) 22.376 22.67624 × 1 23 23.13 (80%) 22.917 23.15325 × 2 23 23.2 (85%) 22.835 23.21025 × 1.5 23.5 23.62 (85%) 23.376 23.67625 × 1 24 24.13 (80%) 23.917 24.153螺纹下孔径表公制細牙螺纹JIS B 0211-1982(單位：mm)螺纹尺寸钻头直径崁合度區分：中(注1)2級(注2)下孔径崁合度區分：中(註1)2級(註2)內螺纹小径最小直径最大直径M26 × 1.5 24.5 24.62 (85%) 24.376 24.67627 × 2 25 25.2(85%) 24.835 25.21027 × 1.5 25.5 25.62 (85%) 25.376 25.67627 × 1 26 26.13 (80%) 25.917 26.15328 × 2 26 26.2(85%) 25.835 26.21028 × 1.5 26.5 26.62 (85%) 26.376 26.67628 × 1 27 27.13 (80%) 26.917 27.15330 × 3 27 27.2 (85%) 26.752 27.25230 × 2 28 28.2 (85%) 27.835 28.21030 × 1.5 28.5 28.62 (85%) 28.376 28.67630 × 1 29 29.13 (80%) 28.917 29.15332 × 2 30 30.2 (85%) 29.835 30.21032 × 1.5 30.5 30.62 (85%) 30.376 30.67633 × 3 30 30.2 (85%) 29.752 30.25233 × 2 31 31.2 (85%) 30.835 31.21033 × 1.5 31.5 31.62 (85%) 31.376 31.67635 × 1.5 33.5 33.62 (85%) 33.376 33.67636 × 3 33 33.2 (85%) 32.752 33.25236 × 2 34 34.2 (85%) 33.835 34.21036 × 1.5 34.5 34.62 (85%) 34.376 34.67638 × 1.5 36.5 36.62 (85%) 36.376 36.67639 × 3 36 36.2 (85%) 35.752 36.25239 × 2 37 37.2 (85%) 36.835 37.21039 × 1.5 37.5 37.62 (85%) 37.376 37.67640 × 3 37 37.2 (85%) 36.752 37.25240 × 2 38 38.2 (85%) 37.835 38.21040 × 1.5 38.5 38.62 (85%) 38.376 38.67642 × 4 38 38.1 (90%) 37.670 38.27042 × 3 39 39.2 (85%) 38.752 39.25242 × 1.5 40.5 40.62 (85%) 40.376 40.676 45 × 4 41 41.1 (90%) 40.670 41.270 45 × 3 42 42.2 (85%) 41.752 42.252 45 × 2 43 43.2 (85%) 42.835 43.210 45 × 1.5 43.5 43.62 (85%) 43.376 43.676 48 × 4 44 44.1 (90%) 43.670 44.270 48 × 3 45 45.2 (85%) 44.752 45.25248 × 2 46 46.2 (85%)45.835 46.21048 × 1.5 46.5 46.62 (85%) 46.376 46.67650 × 3 47 47.2 (85%) 46.752 47.25250 × 2 48 48.2 (85%) 47.835 48.21050 × 1.5 48.5 48.62 (85%) 48.376 48.676註(1)等級：6H(2)基於JIS B 0211-1982標準螺纹下孔径表美制粗牙螺纹(單位：mm)螺纹尺寸钻头直径2B級螺纹下孔径內螺纹小径最小直径最大直径NO.1 -64UNC 1.55 1.57 (65%) 1.425 1.5822 -56 1.8 1.86 (65%) 1.695 1.8713 -48 2.1 2.14 (65%) 1.941 2.1464 -40 2.3 2.36 (70%) 2.157 2.3855 -40 2.6 2.69 (70%) 2.487 2.6976 -32 2.8 2.86 (75%) 2.642 2.8958 -32 3.4 3.52 (75%) 3.302 3.53010 -24 3.9 3.91 (80%) 3.683 3.96212 -24 4.5 4.57 (80%) 4.344 4.5971/4-20 5.1 5.25 (80%) 4.979 5.257 5/16-18 6.6 6.72 (80%) 6.401 6.731 3/8-16 8 8.15 (80%) 7.798 8.153 7/16 -14 9.4 9.50 (80%) 9.144 9.550 1/2-13 10.8 11.0 (80%) 10.592 11.023 9/16 -12 12.2 12.3 (85%) 11.989 12.446 5/8-11 13.6 13.8 (85%) 13.386 13.868 3/4-10 16.5 16.8 (80%) 16.307 16.840 7/8-9 19.5 19.6 (85%) 19.177 19.7611 -8 22.2 22.5 (85%) 21.971 22.60611/8 -7 25 25.2 (85%) 24.638 25.349 11/4 -7 28.2 28.4 (85%) 27.813 28.524 13/8 -6 30.8 31.0 (85%) 30.353 31.115 11/2 -6 34 34.2 (85%) 33.528 34.290 13/4 -5 39.5 39.8 (85%) 38.964 39.8272 - 4 45.2 45.3 (90%) 44.679 45.593螺纹下孔径表美制細牙螺纹(單位：mm)螺纹尺寸钻头直径2B級螺纹下孔径內螺纹小径最小直径最大直径NO.0-80UNF1.25 1.30 (65%) 1.182 1.3051 -72 1.55 1.61 (65%) 1.474 1.6122 -64 1.85 1.90 (65%) 1.756 1.9123 -56 2.1 2.17 (70%) 2.025 2.1974 -48 2.4 2.44 (70%) 2.271 2.4585 -44 2.7 2.74 (70%) 2.551 2.7406 -40 2.9 3.02 (70%) 2.820 3.0228 -36 3.5 3.59 (75%) 3.404 3.60610 -32 4.1 4.14 (80%) 3.963 4.16512 -28 4.6 4.70 (80%) 4.496 4.7241/4-28 5.5 5.56 (80%) 5.360 5.5885/16-24 6.9 7.02 (80%) 6.782 7.035 3/8-24 8.5 8.61 (80%) 8.382 8.6367/16-20 9.9 10.01 (80%) 9.729 10.033 1/2-20 11.5 11.60 (80%) 11.329 11.6079/16-18 12.9 13.07 (80%) 12.751 13.081 5/8-18 14.5 14.65 (80%) 14.351 14.681 3/4-16 17.5 17.59 (85%) 17.323 17.678 7/8-14 20.5 20.6(85%) 20.270 20.675 1-12 23.2 23.5(85%) 23.114 23.5711 1/8 -12 26.5 26.7(80%) 26.289 26.7461 1/4 -12 29.5 29.9(80%) 29.464 29.9211 3/8 -12 32.8 33.0(85%) 32.639 33.0961 1/2 -12 36 36.2(85%) 35.814 36.271螺纹下孔径表英制粗牙螺纹(單位：mm)螺纹尺寸下孔径嵌合率A列(硬材質) B列(軟材質) A列直径B列直径內螺纹最小径內螺纹最大径W 1/8 2.6 2.5 70.7 83.0 70.0 88.3 3/16 3.7 3.6 78.4 85.8 70.0 88.3 1/4 5.1 5.0 76.9 83.0 70.5 88.3 5/16 6.6 6.5 74.0 99.5 70.1 88.4 3/8 8.0 7.9 75.0 80.0 69.5 88.2 7/16 9.4 9.3 73.7 80.0 69.0 88.81/2 10.7 10.5 73.8 81.2 69.0 88.29/16 12.3 12.0 73.4 84.4 69.0 88.25/8 13.7 13.5 73.5 80.3 69.6 88.53/4 16.7 16.5 72.3 78.4 69.6 88.37/8 19.5 19.3 75.4 80.9 70.1 88.41 22.4 22.0 73.8 83.6 71.0 88.21 1/825.0 24.8 76.9 81.3 72.0 88.41 1/428.3 28.0 74.3 80.7 72.0 88.41 3/830.5 30.3 81.6 85.3 73.8 88.61 1/233.8 33.5 79.3 84.8 73.8 88.61 5/836.0 35.7 81.1 85.7 74.8 88.31 3/439.2 39.0 80.7 83.8 74.8 88.31 7/841.8 41.5 80.6 84.7 74.7 88.42 45.0 44.7 80.2 84.4 74.7 88.4螺纹下孔径表英制管用螺纹(單位：mm)管用螺纹尺寸JIS B 0203 JIS B 2301 錐管內螺纹Rc(PT) 平行內螺纹Rp(PS) 錐管內螺纹計算值下孔径計算值下孔径計算值下孔径1/16 6.230 6.2 6.490 6.5 －－1/8 8.235 8.2 8.495 8.5 8.191 8.2 1/4 10.941 10.9 11.341 11.4 10.945 10.9 3/8 14.428 14.4 14.846 14.9 14.388 14.4 1/2 17.950 18 18.489 18.5 17.943 18 3/4 23.349 23 23.975 24 23.305 23 1 29.423 29 30.111 30 29.353 29 1 1/437.940 38 38.772 39 37.890 381 1/243.833 44 44.565 45 43.720 432 55.412 55 56.476 56 55.406 552 1/270.701 71 72.009 72 70.788 703 83.201 83 84.709 85 83.364 833 1/295.547 96 97.155 97 95.747 954 107.834 108 109.855 110 108.322 1085 133.110 133 135.255 135 133.597 1336 158.510 159 160.655 161 158.810 1587 183.360 183 185.954 1868 208.560 209 211.354 2129 233.960 234 236.754 23710 259.166 259 262.154 26212 309.747 310 312.875 313螺纹下孔径表英制平行管用螺纹PF(G) (單位：mm) 螺纹下孔径內螺纹小径(參考)尺寸大径標準嵌合高度H系列100 95 90 85 80 75 70 65 60 最小直径最大直径G 1/16 7.723 0.5808 6.56 6.62 6.68 6.74 6.79 6.85 6.91 6.97 7.03 6.843 6.561 G(PF)1/8 9.728 〞8.57 8.62 8.68 8.74 8.80 8.86 8.92 8.97 9.03 8.848 8.566 1/4 13.157 0.8560 11.53 11.62 11.70 11.79 11.87 11.96 12.04 12.13 11.890 11.445 3/8 16.662 〞14.95 15.04 15.12 15.21 15.29 15.38 15.46 15.55 15.64 15.395 14.950 1/2 20.955 1.1618 18.8 18.9 19.0 19.1 19.2 19.3 19.4 19.6 19.172 18.631 5/8 22.911 〞20.6 20.7 20.8 20.9 21.0 21.2 21.3 21.4 21.5 21.130 20.589 3/4 26.441 〞24.2 24.4 24.5 24.6 24.7 24.8 24.9 25.0 24.658 24.117 7/8 30.201 〞27.9 28.0 28.1 28.2 28.3 38.5 28.6 28.7 28.8 28.418 27.877 1 33.249 14.786 30.3 30.4 30.6 30.7 30.9 31.0 31.2 31.3 31.5 30.931 30.2911 1/837.897 〞35.1 35.2 35.4 35.5 35.7 35.8 35.9 36.5 35.579 34.939 1 1/441.910 〞39.0 39.1 39.2 39.4 39.6 39.7 39.8 40.0 40.1 39.592 38.952 1 3/844.323 〞41.4 41.5 41.7 41.8 42.0 42.1 42.2 42.4 42.6 42.005 41.3651 1/247.803 〞45.0 45.1 45.3 45.4 45.6 45.7 45.9 46.0 45.485 49.0231 5/851.910 〞49.2 49.3 49.5 49.6 49.8 49.9 50.0 50.2 49.672 50.7881 3/453.746 〞50.8 50.9 51.1 51.2 51.4 51.5 51.7 52.0 52.0 51.428 56.6562 59.614 〞56.8 57.0 57.1 57.2 57.4 57.5 57.8 57.8 57.296使用粗線左側數據作為攻絲前的底孔直径，可加工符合JIS B 0202的A級或B級的內螺纹小径。
国标螺纹底孔直径对照表
国标螺纹底孔直径通常是指螺纹孔底部的孔径，它与螺纹的直径和螺距有关。常见的国家标准包括GB/T5781-2000、GB/T5782-2000等，这些标准规定了不同直径和螺距的螺纹底孔直径。以下是一些常见的国标螺纹底孔直径对照表（仅供参考，具体应以最新的国家标准为准）：
GB/T5781-2000（普通螺栓、螺母）
螺纹直径（mm）
底孔直径（mm）
M3
2.5
M4
3.3
M5
4.2
M6
5.0
M8
6.8
M10
8.5
M12
10.2
M14
12.0
M16
14.8
M18
16.8
M20
18.8
GB/T5782-2000（高强度螺栓、螺母）
螺纹直径（mm）
底孔直径（mm）
M16
14.8
M18
16.8
M20
18.8
M22
21.0
M2423.0Fra bibliotekM2725.6
M30
28.6
M33
31.6
M36
34.6
M39
37.6
M42
40.7
请注意，以上数据仅为示例，具体的螺纹底孔直径应该参照最新版本的国家标准，以确保在工程和制造中使用正确的规格。
螺纹孔径对照表
当之处，应视实际状况适当的变更钻头直径。
本表是依据2级牙制订。
注：迫牙丝攻之钻孔径，在上表所列之数
值，由于被加工 材料之材质、硬度、形状
、尺寸等之影响，多少会有所变动，因此于
参考上表之同时，亦请增减若干。
螺纹攻牙钻孔径和滚造径对照表
本表所推选之钻头孔径，是针对攻牙加工时，能够很容易的了解钻孔直径；而依据市售之标准钻头所选定的。
在使用钻头的情况下，由于钻头的形状及尺寸、精度、被钻孔之材质等，对于所钻孔的尺寸、精度有很大的影响，所以使用本表之钻孔径，若有不。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
各种螺纹详细参数和钻孔直径对照表螺纹下孔径表螺纹尺寸钻头直径崁合度區分：中(注1)2級(注2)下孔径崁合度區分：中(註1)2級(註2)內螺纹小径最小直径最大直径M1× 0.25 0.75 0.78 (80%) 0.729 0.7851.1 × 0.25 0.85 0.88 (80%) 0.829 0.8851.2 × 0.25 0.95 0.98 (80%) 0.929 0.9851.4 × 0.3 1.1 1.14 (80%) 1.075 1.1421.6 × 0.35 1.25 1.32 (75%) 1.221 1.3211.8 × 0.35 1.45 1.52 (75%) 1.421 1.5212× 0.4 1.6 1.65 (80%) 1.567 1.6792.2 × 0.45 1.75 1.83 (75%) 1.713 1.8382.5 × 0.45 2.1 2.13 (75%) 2.013 2.1383× 0.5 2.5 2.59 (75%) 2.459 2.5993.5 × 0.6 2.9 3.01 (75%) 2.850 3.0104× 0.7 3.3 3.39 (80%) 3.242 3.4224.5 × 0.75 3.8 3.85 (80%) 3.688 3.8785× 0.8 4.2 4.31 (80%) 4.134 4.334 6× 1 5 5.13 (80%) 4.917 5.153 7× 1 6 6.13 (80%) 5.917 6.153 8× 1.25 6.8 6.85 (85%) 6.647 6.912 9× 1.25 7.8 7.85 (85%) 7.647 7.912 10× 1.5 8.5 8.62 (85%) 8.376 8.676 11× 1.5 9.5 9.62 (85%) 9.376 9.676 12× 1.75 10.3 10.40 (85%) 10.106 10.441 14× 2 12 12.2 (85%) 11.835 12.210 16× 2 14 14.2 (85%) 13.835 14.210 18× 2.5 15.5 15.7 (85%) 15.294 15.744 20× 2.5 17.5 17.7 (85%) 17.294 17.744 22× 2.5 19.5 19.2 (85%) 19.294 19.744 24× 3 21 21.2 (85%) 20.752 21.252 27× 3 24 24.2 (85%) 23.752 24.252 30× 3.5 26.5 26.6 (90%) 26.211 26.771 33× 3.5 29.5 29.6 (90%) 29.211 29.771 36× 4 32 32.1 (90%) 31.670 32.27039 × 4 35 35.1 (90%) 34.670 35.27042 × 4.5 37.5 37.6 (90%) 37.129 37.79945 × 4.5 40.5 40.6 (90%) 40.129 40.79948 × 5 43 43.1 (90%) 42.587 43.297 註(1)M1.4以下等級：5H、M1.6以上等級：6H(2)基於JIS B 0209-1982標準螺纹下孔径表螺纹尺寸钻头直径崁合度區分：中(注1)2級(注2)下孔径崁合度區分：中(註1)2級(註2)內螺纹小径最小直径最大直径M2.5 × 0.35 2.2 2.22 (75%) 2.121 2.221 3× 0.35 2.7 2.72 (75%) 2.621 2.7213.5 × 0.35 3.2 3.22 (75%) 3.121 3.2214× 0.5 3.5 3.59 (75%) 3.459 3.5994.5 × 0.5 4 4.09 (75%) 3.959 4.0995× 0.5 4.5 4.59 (75%) 4.459 4.5995.5 × 0.5 5 5.09 (75%) 4.959 5.0996× 0.75 5.3 5.35 (80%) 5.188 5.378 7× 0.75 6.3 6.35 (80%) 6.188 6.378 8× 1 7 7.13 (80%) 6.917 7.153 8× 0.75 7.3 7.35 (80%) 7.188 7.378 9× 1 8 8.13 (80%) 7.917 8.153 9× 0.75 8.3 8.35 (80%) 8.188 8.378 10× 1.25 8.8 8.85 (85%) 8.647 8.912 10× 1 9 9.13 (80%) 8.917 9.153 10× 0.75 9.3 9.35 (80%) 9.188 9.37811 × 1 10 10.13 (80%) 9.917 10.15311 × 0.75 10.3 10.35 (80%) 10.188 10.37812 × 1.5 10.5 10.62 (85%) 10.376 10.67612 × 1.25 10.8 10.85 (85%) 10.647 10.91212 × 1 11 11.13 (80%) 10.917 11.15314 × 1.5 12.5 12.62 (85%) 12.376 12.67614 × 1 13 13.13 (80%) 12.917 13.15315 × 1.5 13.5 13.62 (85%) 13.376 13.67615 × 1 14 14.13 (80%) 13.917 14.15316 × 1.5 14.5 14.62 (85%) 14.376 14.67616 × 1 15 15.13 (80%) 14.917 15.15317 × 1.5 15.5 15.62 (85%) 15.376 15.67617 × 1 16 16.13 (80%) 15.917 16.15318 × 2 16 16.2 (85%) 15.835 16.21018 × 1.5 16.5 16.62 (85%) 16.376 16.67618 × 1 17 17.13 (80%) 16.917 17.15320 × 2 18 18.2 (85%) 17.835 18.21020 × 1.5 18.5 18.62 (85%) 18.376 18.67620 × 1 19 19.13 (80%) 18.917 19.15322 × 2 20 20.2 (85%) 19.835 20.21022 × 1.5 20.5 20.62 (85%) 20.376 20.67622 × 1 21 21.13 (80%) 20.917 21.15324 × 2 22 22.2 (85%) 21.835 22.21024 × 1.5 22.5 22.62 (85%) 22.376 22.67624 × 1 23 23.13 (80%) 22.917 23.15325 × 2 23 23.2 (85%) 22.835 23.21025 × 1.5 23.5 23.62 (85%) 23.376 23.67625 × 1 24 24.13 (80%) 23.917 24.153 螺纹下孔径表螺纹尺寸钻头直径崁合度區分：中(注1)2級(注2) 崁合度區分：中(註1)2級(註2)內螺纹小径下孔径最小直径最大直径M26 × 1.5 24.5 24.62 (85%) 24.376 24.67627 × 2 25 25.2(85%) 24.835 25.21027 × 1.5 25.5 25.62 (85%) 25.376 25.67627 × 1 26 26.13 (80%) 25.917 26.15328 × 2 26 26.2(85%) 25.835 26.21028 × 1.5 26.5 26.62 (85%) 26.376 26.67628 × 1 27 27.13 (80%) 26.917 27.15330 × 3 27 27.2 (85%) 26.752 27.25230 × 2 28 28.2 (85%) 27.835 28.21030 × 1.5 28.5 28.62 (85%) 28.376 28.67630 × 1 29 29.13 (80%) 28.917 29.15332 × 2 30 30.2 (85%) 29.835 30.21032 × 1.5 30.5 30.62 (85%) 30.376 30.67633 × 3 30 30.2 (85%) 29.752 30.25233 × 2 31 31.2 (85%) 30.835 31.21033 × 1.5 31.5 31.62 (85%) 31.376 31.67635 × 1.5 33.5 33.62 (85%) 33.376 33.67636 × 3 33 33.2 (85%) 32.752 33.25236 × 2 34 34.2 (85%) 33.835 34.21036 × 1.5 34.5 34.62 (85%) 34.376 34.67638 × 1.5 36.5 36.62 (85%) 36.376 36.67639 × 3 36 36.2 (85%) 35.752 36.25239 × 2 37 37.2 (85%) 36.835 37.21039 × 1.5 37.5 37.62 (85%) 37.376 37.67640 × 3 37 37.2 (85%) 36.752 37.25240 × 2 38 38.2 (85%) 37.835 38.21040 × 1.5 38.5 38.62 (85%) 38.376 38.67642 × 4 38 38.1 (90%) 37.670 38.27042 × 3 39 39.2 (85%) 38.752 39.25242 × 2 40 40.2 (85%) 39.835 40.21042 × 1.5 40.5 40.62 (85%) 40.376 40.67645 × 4 41 41.1 (90%) 40.670 41.27045 × 3 42 42.2 (85%) 41.752 42.25245 × 2 43 43.2 (85%) 42.835 43.21045 × 1.5 43.5 43.62 (85%) 43.376 43.67648 × 4 44 44.1 (90%) 43.670 44.27048 × 3 45 45.2 (85%) 44.752 45.25248 × 2 46 46.2 (85%) 45.835 46.21048 × 1.5 46.5 46.62 (85%) 46.376 46.67650 × 3 47 47.2 (85%) 46.752 47.25250 × 2 48 48.2 (85%) 47.835 48.21050 × 1.5 48.5 48.62 (85%) 48.376 48.676 註(1)等級：6H(2)基於JIS B 0211-1982標準螺纹下孔径表螺纹尺寸钻头直径2B級螺纹內螺纹小径下孔径最小直径最大直径NO.1 -64UNC 1.55 1.57 (65%) 1.425 1.5822 -56 1.8 1.86 (65%) 1.695 1.8713 -48 2.1 2.14 (65%) 1.941 2.1464 -40 2.3 2.36 (70%) 2.157 2.3855 -40 2.6 2.69 (70%) 2.487 2.6976 -32 2.8 2.86 (75%) 2.642 2.8958 -32 3.4 3.52 (75%) 3.302 3.53010 -24 3.9 3.91 (80%) 3.683 3.96212 -24 4.5 4.57 (80%) 4.344 4.5971/4-20 5.1 5.25 (80%) 4.979 5.257 5/16-18 6.6 6.72 (80%) 6.401 6.731 3/8-16 8 8.15 (80%) 7.798 8.153 7/16 -14 9.4 9.50 (80%) 9.144 9.550 1/2-13 10.8 11.0 (80%) 10.592 11.023 9/16 -12 12.2 12.3 (85%) 11.989 12.446 5/8-11 13.6 13.8 (85%) 13.386 13.868 3/4-10 16.5 16.8 (80%) 16.307 16.840 7/8-9 19.5 19.6 (85%) 19.177 19.7611 -8 22.2 22.5 (85%) 21.971 22.60611/8 -7 25 25.2 (85%) 24.638 25.349 11/4 -7 28.2 28.4 (85%) 27.813 28.524 13/8 -6 30.8 31.0 (85%) 30.353 31.115 11/2 -6 34 34.2 (85%) 33.528 34.290 13/4 -5 39.5 39.8 (85%) 38.964 39.8272 - 4 45.2 45.3 (90%) 44.679 45.593 螺纹下孔径表螺纹尺寸钻头直径2B級螺纹下孔径內螺纹小径最小直径最大直径NO.0-80UNF 1.25 1.30 (65%) 1.182 1.3051 -72 1.55 1.61 (65%) 1.474 1.6122 -64 1.85 1.90 (65%) 1.756 1.9123 -56 2.1 2.17 (70%) 2.025 2.1974 -48 2.4 2.44 (70%) 2.271 2.4585 -44 2.7 2.74 (70%) 2.551 2.7406 -40 2.9 3.02 (70%) 2.820 3.0228 -36 3.5 3.59 (75%) 3.404 3.60610 -32 4.1 4.14 (80%) 3.963 4.16512 -28 4.6 4.70 (80%) 4.496 4.7241/4-28 5.5 5.56 (80%) 5.360 5.588 5/16-24 6.9 7.02 (80%) 6.782 7.035 3/8-24 8.5 8.61 (80%) 8.382 8.636 7/16-20 9.9 10.01 (80%) 9.729 10.033 1/2-20 11.5 11.60 (80%) 11.329 11.607 9/16-18 12.9 13.07 (80%) 12.751 13.081 5/8-18 14.5 14.65 (80%) 14.351 14.681 3/4-16 17.5 17.59 (85%) 17.323 17.678 7/8-14 20.5 20.6(85%) 20.270 20.675 1-12 23.2 23.5(85%) 23.114 23.5711 1/8 -12 26.5 26.7(80%) 26.289 26.7461 1/4 -12 29.5 29.9(80%) 29.464 29.9211 3/8 -12 32.8 33.0(85%) 32.639 33.0961 1/2 -12 36 36.2(85%) 35.814 36.271 螺纹下孔径表螺纹尺寸下孔径嵌合率A列(硬材質) B列(軟材質) A列直径B列直径內螺纹最小径內螺纹最大径W 1/8 2.6 2.5 70.7 83.0 70.0 88.3 3/16 3.7 3.6 78.4 85.8 70.0 88.3 1/4 5.1 5.0 76.9 83.0 70.5 88.3 5/16 6.6 6.5 74.0 99.5 70.1 88.4 3/8 8.0 7.9 75.0 80.0 69.5 88.2 7/16 9.4 9.3 73.7 80.0 69.0 88.8 1/2 10.7 10.5 73.8 81.2 69.0 88.2 9/16 12.3 12.0 73.4 84.4 69.0 88.2 5/8 13.7 13.5 73.5 80.3 69.6 88.5 3/4 16.7 16.5 72.3 78.4 69.6 88.3 7/8 19.5 19.3 75.4 80.9 70.1 88.41 22.4 22.0 73.8 83.6 71.0 88.21 1/825.0 24.8 76.9 81.3 72.0 88.41 1/428.3 28.0 74.3 80.7 72.0 88.41 3/830.5 30.3 81.6 85.3 73.8 88.61 1/233.8 33.5 79.3 84.8 73.8 88.61 5/836.0 35.7 81.1 85.7 74.8 88.31 3/439.2 39.0 80.7 83.8 74.8 88.31 7/841.8 41.5 80.6 84.7 74.7 88.42 45.0 44.7 80.2 84.4 74.7 88.4 螺纹下孔径表管用螺纹尺寸JIS B 0203 JIS B 2301 錐管內螺纹Rc(PT) 平行內螺纹Rp(PS) 錐管內螺纹計 算 值 下 孔 径 計 算 值 下 孔 径 計 算 值 下 孔 径 1/166.230 6.2 6.490 6.5 － － 1/8 8.235 8.2 8.495 8.5 8.191 8.2 1/4 10.941 10.9 11.341 11.4 10.945 10.9 3/8 14.428 14.4 14.846 14.9 14.388 14.4 1/2 17.950 18 18.489 18.5 17.943 18 3/4 23.349 23 23.975 24 23.305 23 1 29.423 29 30.111 30 29.353 29 1 1/4 37.940 38 38.772 39 37.890 38 1 1/2 43.833 44 44.565 45 43.720 43 2 55.412 55 56.476 56 55.406 55 2 1/2 70.701 71 72.009 72 70.788 70 3 83.201 83 84.709 85 83.364 83 3 1/2 95.547 96 97.155 97 95.747 95 4 107.834 108 109.855 110 108.322 108 5 133.110 133 135.255 135 133.597 133 6 158.510 159 160.655 161 158.810158 7 183.360 183 185.954 186 8 208.560 209 211.354 212 9 233.960 234 236.754 237 10 259.166 259 262.154 262 12309.747310312.875313螺纹下孔径表螺 纹 下 孔 径 內螺纹小径(參考)尺 寸大 径標準嵌合 高度H系 列10095 90 85 80 75 70 65 60 最小直径 最大直径 G 1/16 7.723 0.5808 6.56 6.62 6.68 6.74 6.79 6.85 6.91 6.97 7.03 6.843 6.561 G(PF)1/8 9.728〞 8.57 8.62 8.68 8.74 8.80 8.86 8.92 8.97 9.03 8.848 8.566 1/4 13.157 0.8560 11.53 11.62 11.70 11.79 11.87 11.96 12.04 12.13 11.890 11.445 3/8 16.662 〞 14.95 15.04 15.12 15.21 15.29 15.38 15.46 15.55 15.64 15.395 14.950 1/2 20.955 1.1618 18.8 18.9 19.0 19.1 19.2 19.3 19.4 19.6 19.172 18.631 5/8 22.911 〞 20.6 20.7 20.8 20.9 21.0 21.2 21.3 21.4 21.5 21.130 20.589 3/4 26.441 〞 24.2 24.4 24.5 24.6 24.7 24.8 24.9 25.0 24.658 24.117 7/8 30.201 〞 27.9 28.0 28.1 28.2 28.3 38.5 28.6 28.7 28.8 28.418 27.877 1 33.249 14.786 30.3 30.4 30.6 30.7 30.9 31.0 31.2 31.3 31.5 30.931 30.291 1 1/8 37.897 〞 35.1 35.2 35.4 35.5 35.7 35.8 35.9 36.5 35.579 34.939 1 1/4 41.910 〞 39.0 39.1 39.2 39.4 39.6 39.7 39.8 40.0 40.1 39.592 38.952 1 3/8 44.323 〞 41.4 41.5 41.7 41.8 42.0 42.1 42.2 42.4 42.6 42.005 41.365 1 1/2 47.803 〞 45.0 45.1 45.3 45.4 45.6 45.7 45.9 46.0 45.485 49.023 1 5/8 51.910 〞 49.2 49.3 49.5 49.6 49.8 49.9 50.0 50.2 49.672 50.788 1 3/4 53.746 〞 50.850.951.151.251.451.551.752.052.051.42856.6562 59.614 〞56.8 57.0 57.1 57.2 57.4 57.5 57.8 57.8 57.296管用螺纹尺寸斜行螺纹(NPT) 平行螺纹(NPS) 钻头直径钻头直径使用鉸刀場合不使用鉸刀場合1/16 －0.234 ( 5.94)0.246( 6.15) 1/4 0.250 ( 6.35)1/8 21/64 0.328 ( 8.33) －0.332( 8.43) 11/32 0.344 ( 8.74)1/4 27/64 0.422 (10.72) 7/16 0.438 (11.13) 7/16 0.438 (11.13)3/8 9/16 0.562 (14.27) 9/16 0.562 (14.27) 37/64 0.578 (14.68) 1/2 11/16 0.688 (17.48) 45/64 0.703 (17.86) 23/32 0.719 (18.26) 3/4 57/64 0.891 (22.63) 29/32 0.906 (23.01) 59/64 0.922 (23.42)1 1 1/8 1.125 (28.58) 19/64 1.141 (28.98) 1 5/32 1.156 (29.36)1 1/4 1 15/32 1.469 (37.31) 1 31/64 1.484 (37.69) 1 1/2 1.500 (38.10)1 1/2 1 1/16 1.703 (43.26) 123/32 1.719 (43.66) 1 3/4 1.750 (44.45)2 2 11/64 2.172 (55.17) 2 3/16 2.188 (55.58) 27/32 2.219 (56.36)2 1/2 2 39/64 2.578 (65.48) 2 39/64 2.609 (66.27) 221/32 2.656 (67.46)上述钻头直径來源於美制管用螺纹ANSI／ASME B—1983 Pipe Threads, General Purpose (Inch)標準。