螺纹尺寸公差

作者:日期:

代号（大径） d = D

螺距 P 螺纹中径 d2 = D2 外螺纹小径 d1 内螺纹小径 D1 外螺纹

全齿高 H2 配合齿高 H1 螺纹中径尺寸 （6H 公差带级别） 丝锥螺纹中径 （H2公差带级别为例） min max min max M3

0.5 2.672 2.387 2.459 0.307 0.271 2.675 2.775 2.699 2.714 M3.5

0.6 3.110 2.764 2.850 0.368 0.325 3.110 3.222 3.137 3.155 M4

0.7 3.545 3.141 3.242 0.429 0.379 3.545 3.663 3.574 3.593 M5

0.8 4.480 4.019 4.134 0.491 0.433 4.480 4.605 4.510 5.530 M6

1.0 5.350 4.773 4.937 0.613 0.541 5.350 5.500 5.385 5.408 M7

1.0 6.350 5.773 5.937 0.613 0.541 6.350 6.500 6.385 6.408 M8

1.25 7.188 6.466 6.647 0.767 0.677 7.188 7.348 7.226 7.251 M10

1.5 9.026 8.160 8.376 0.920 0.812 9.026 9.206 9.068 9.096 M12

1.75 10.863 9.853 10.106 1.074 0.947 10.863 11.063 10.911 10.943 M14

2.0 12.701 11.546 11.835 1.227 1.083 12.701 12.913 12.752 12.786 M16

2.0 14.701 1

3.546 13.835 1.227 1.083 1

4.701 14.913 14.752 14.786 M18

2.5 16.373 14.933 15.294 1.534 1.353 16.376 16.600 16.430 16.466 M20

2.5 18.376 16.933 17.294 1.534 1.353 18.376 18.600 18.430 18.466 M22

2.5 20.376 18.933 19.294 1.534 1.353 20.376 20.600 20.430

20.466 M 米制粗牙螺纹基本牙型与尺寸和公差带 H 二琴 P=0.866025F Hi= -|=H = 0.br3F H2= ^H = Q,61343 P d2=D2 = d-0.51952P di = d-2H=d-1.22687P r w 丨=[■.11434- 6

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MF米制细牙螺纹基本牙型与尺寸和公差带

H 二琴卩=0.866C25P

Hi= |-H=0.5^i3F H?=捋HMEi 沁P

d2=l-?=d-C.519b/^ di=d-2H=dl-\226S/P r ::i 告二C144e /八/

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M22 2.0 20.701 19.546 19.835 1.227 1.083 20.701 20.913 20.752 20.786

MF 米制细牙螺纹基本牙型与尺寸和公差带 UNC 统一粗牙螺纹基本牙型与尺寸和公差带

代号 （螺纹直径一

25.4m 内牙数） 螺距 P

螺纹大径 d =D 螺纹中径 d2=D2 内螺纹小径 D1 外螺纹小径 d1 螺纹中径尺寸 丝锥螺纹中径 2B 3B min 2B max 3B max min max NO.5 — 40 0.635

3.175 2.746 2.487 2.395 2.764 2.847 2.827 2.776 2.789 NO.6 — 32 0.794

3.505 2.990 2.647 2.532 2.990 3.084 3.058 3.105 3.028 NO.8 — 32 0.794

4.166 3.650 3.307 3.193 3.650 3.746 3.721 3.675 3.688 NO.10 — 24 1.058

4.826 4.138 3.680 3.528 4.138 4.247 4.219 4.963 4.176 NO.12 — 24 1.058

5.486 4.798 4.341 4.188 4.798 4.910 4.882 4.823 4.836 UNC1/4 " -20 1.270

6.350 5.524 4.976 4.793 5.524 5.646 5.616 5.575 5.588 UNC5/16"-18 1.411

7.938 7.021 6.411 6.205 7.021 7.155 7.120 7.071 7.084 UNC3/8 "-16 1.588

9.525 8.494 7.805 7.577 8.494 8.639 8.603 8.545 8.557 UNC7/16"-14 1.814

11.112 9.934 9.149 8.887 9.934 10.089 10.051 9.985 9.997 UNC1/2 "-13 1.954

12.700 11.430 10.584 10.302 11.430 11.595 11.552 11.481 11.494 UNC9/16"-12 2.117

14.288 12.913 11.996 11.692 12.913 13.086 13.043 12.964 12.977 UNC5/8 "-11 2.309

15.875 14.376 13.376 13.043 14.376 14.559 14.514 14.427 14.440 UNC3/4 "-10 2.540

19.050 17.399 16.229 15.933 17.399 17.595 17.544 17.450 17.463 UNC7/8" -9 2.822

22.225 20.390 19.169 18.763 20.391 20.599 20.546 20.455 20.467 UNC1 " -8 3.175

25.400 23.338 21.963 21.504 23.338 23.561 23.505 23.401 23.414

H 二萼 P=0.866025^

Hi=甘 H = 0.5113P

O -7

He 莎H 二C&別歹

Hd2 = D2=d-0.6d952 P

di=(l-2H=d-b2268/^ r :

=O,H434P

7^^ 77

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