AMS2241S

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AEROSPACE
MATERIAL SPECIFICATION AMS2241™
REV. S
Issued 1945-05
Reaffirmed 2012-10
Revised 2016-01
Superseding AMS2241R
Tolerances, Corrosion and Heat-Resistant Steel, Iron Alloy,
Titanium, and Titanium Alloy Bars and Wire
RATIONALE
AMS2241S revises tolerances for machined bars (2.1.4, Table 3), clarifies the intent of precision ground or precision polished rounds (2.1.6, Table 5), and is a Five Year Review and update of this specification.
1. SCOPE
This specification covers established manufacturing tolerances applicable to corrosion and heat-resistant steel, iron alloy, titanium, and titanium alloy bars and wire. These tolerances apply to all conditions, unless otherwise noted. The term “excl” is used to apply only to the higher figure of the specified range.
2. DIAMETER, THICKNESS, AND WIDTH
Specified dimensions apply to diameter of rounds, to distance between parallel sides of hexagons and squares, and separately to width and thickness of rectangles.
2.1 Cold Finished
2.1.1 Cold Drawn Rounds, Squares, Hexagons, and Octagons (see 2.1.3)
Shall be as shown in Table 1.
Table 1A - Tolerances, diameter or thickness, inch/pound units
Specified Diameter or Thickness
Inches Tolerance, Inch
Plus and Minus
(see 2.1.1.1)
Rounds
Tolerance, Inch
Minus Only
Squares, Hexagons,
and Octagons
(see 2.1.1.2)
Over 0.500 to 1.000, excl 0.002 0.004
1.000 0.0025 0.004 Over 1.000 to 1.500, excl 0.0025 0.006
1.500 to
2.000, incl 0.003 0.006 Over 2.000 to
3.000, incl 0.003 0.008 Over 3.000 to
4.000, incl 0.003 0.010 Table 1B - Tolerances, diameter or thickness, SI units
Specified Diameter or Thickness
Millimeters Tolerance, Millimeter
Plus and Minus
(see 2.1.1.1)
Rounds
Tolerance, Millimeter
Minus Only
Squares, Hexagons,
and Octagons
(see 2.1.1.2)
Over 12.50 to 25.00, excl 0.05 0.10
25.00 0.062 0.10
Over 25.00 to 37.50, excl 0.062 0.15
37.50 to 50.00, incl 0.08 0.15
Over 50.00 to 75.00, incl 0.08 0.20
Over 75.00 to 100.00, incl 0.08 0.25
2.1.1.1 Size tolerances for round bars are plus and minus as shown in Table 1. When required, however, they may be
specified all plus and nothing minus, or all minus and nothing plus, or any combination of plus and minus, if the total spread in size tolerance for a specified size is not less than the total spread shown in Table 1.
2.1.1.2 For titanium and titanium alloys, the difference among the three measurements of the distance between opposite
faces of hexagons shall be not greater than one-half the size tolerance and the difference between the measurements of the distance between opposite faces of octagons shall be not greater than the size tolerance.
2.1.2 Cold Drawn Flats (see 2.1.3)
Shall be as shown in Table 2.
Table 2A - Tolerances, thickness and width, inch/pound units
Specified Width
Inches
Thickness
Tolerance, Inch
Plus and Minus
Width
Tolerance, Inch
Plus and Minus
0.125 to 0.250, incl 0.002 0.004 Over 0.250 to 1.000, incl 0.002 0.002 Over 1.000 to 2.000, incl 0.003 0.003 Over 2.000 to 3.000, incl 0.004 0.004 Over 3.000 to 4.500, incl 0.005 0.005
Table 2B - Tolerances, thickness and width, SI units
Specified Width Millimeters
Thickness
Tolerance, Millimeter
Plus and Minus
Width
Tolerance, Millimeter
Plus and Minus
3.00 to 6.00, incl 0.05 0.10
Over 6.00 to 25.00, incl 0.05 0.05
Over 25.00 to 50.00, incl 0.08 0.08
Over 50.00 to 75.00, incl 0.10 0.10
Over 75.00 to 115.00, incl 0.12 0.12
If cold drawn bars are ordered heat treated or heat treated and pickled after cold finishing, tolerances shall be double those of Table 1 and Table 2.
2.1.3 Machined or Turned Bars
2.1.
3.1 Rounds
Tolerances for machined or turned round bars 0.375 inch (9.53 mm) and over in specified diameter or thickness are shown in Table 3. Bars up to 0.375 inch (9.53 mm), exclusive, in specified diameter or thickness are commonly supplied centerless ground.
Table 3A - Tolerances, machined or turned bars, inch/pound units
Specified Diameter or Thickness
Inches Tolerance
plus only
Inch
Out of Round
Inch
0.375 to 2.000, incl 0.016 0.008 Over 2.000 to 4.000, incl 0.031 0.016
Over 4.000 to 4.500, incl Over 4.500 to 5.500, incl Over 5.500 to 6.500, incl Over 6.500 to 8.000, incl Over 8.000 to 12.000, incl Over 12.000 to 15.000, incl Over 15.000 to 25.000, incl 0.062
0.078
0.125
0.156
0.187
0.219
0.250
0.046
0.058
0.070
0.085
0.094
0.109
0.125
Table 3B - Tolerances, machined or turned bars, SI units
Specified Diameter or Thickness
Millimeters Tolerance
plus only
Millimeter
Out of Round
Millimeter
9.525 to 50.80, incl 0.406 0.203 Over 50.80 to 101.6, incl 0.787 0.406
Over 101.6 to 115.0, incl Over 115.0 to 140.0, incl Over 140.0 to 165.0, incl Over 165.0 to 200.0, incl Over 200.0 to 300.0, incl Over 300.0 to 400.0, incl Over 400.0 to 625.0, incl 1.600
2.000
3.000
4.000
4.800
5.500
6.500
1.200
1.500
1.800
2.200
2.400
2.800
3.200
2.1.
3.2
Flats
Tolerances for machined flat bars shall be as agreed upon by purchaser and producer. 2.1.4
Centerless Ground or Polished Round Bars
Tolerances for centerless ground or polished bars 0.125 to 4.062 inches (3.18 to 103.17 mm), inclusive, in specified diameter are shown in Table 4. Bars over 4.062 inches (103.17 mm) specified diameter are commonly supplied machined.
Table 4A - Tolerances, centerless-ground or polished bars, inch/pound units
Specified Diameter Inches
Tolerance plus or minus
Inch Out of Round
Inch 0.125 to 0.3125, excl 0.001 0.001 0.3125 to 0.500, excl 0.0015 0.0015 0.500 to 1.000, excl 0.002 0.002 1.000 to 1.500, incl 0.0025 0.0025 Over 1.500 to 3.250, incl 0.003 0.003 Over 3.250 to 4.062
0.005
0.005
Table 4B - Tolerances, centerless-ground or polished bars, SI units Specified Diameter Millimeters Tolerance plus or minus Millimeter Out of Round Millimeter 3.175 t o 7.938 , excl 0.025 0.025 7.938 t o 12.70, excl 0.038 0.038 12.70 to 25.40, excl 0.051 0.051 25.40 to 38.10, incl 0.064 0.064 Over 38.10 to 82.55, incl 0.076 0.076 Over 82.55 to 103.2
0.127
0.127
2.1.5
Precision Ground or Precision Polished Round Bars
Shall be as shown in Table 5.
Table 5A - Tolerances, precision ground or precision polished rounds, inch/pound units
Specified Diameter
Inches
Tolerance Inch Minus only Up to 1.500, incl
0.001 Over 1.500 to 2.500, excl 0.0015 Over 2.500 to 3.000, incl 0.002 Over 3.000 to 4.000, incl
0.003
Table 5B - Tolerances, precision ground or precision polished rounds, SI units
Specified Diameter
Millimeters
Tolerance Millimeter Minus only Up to 38.1, incl
0.03 Over 38.1 to 63.5, excl
0.04 63.5 to 76.2, incl 0.05 Over 76.2 to 101.6, incl
0.08
2.2 Cold Drawn Wire
2.2.1 Rounds, Squares, Hexagons, and Octagons (see 2.2.1.1)
Shall be as shown in Table 6.
Table 6A - Tolerances, diameter or thickness, inch/pound units
Specified Diameter or Thickness
Inch
Tolerance, Inch
Plus and Minus
Rounds and Squares
Tolerance, Inch
Minus Only
Hexagons and Octagons
(see 2.2.1.3)
0.003 to 0.0048, excl 0.0001 -- 0.0048 to 0.008, excl 0.0002 -- 0.008 to 0.012, excl 0.0003 -- 0.012 to 0.024, excl 0.0004 (see 2.2.1.2) -- 0.024 to 0.033, excl 0.0005 (see 2.2.1.2) -- 0.033 to 0.044, excl 0.0008 -- 0.044 to 0.125, excl 0.001 -- 0.125 to 0.3125, excl 0.001 0.002 0.3125 to 0.500, excl 0.0015 0.003 0.500 0.002 0.004
Table 6B - Tolerances, diameter or thickness, SI units
Specified Diameter or Thickness
Millimeters Tolerance, Millimeter
Plus and Minus
Rounds and Squares
Tolerance, Millimeter
Minus Only
Hexagons and Octagons
(see 2.2.1.3)
0.08 to 0.12, excl 0.002 --
0.12 to 0.20, excl 0.005 --
0.20 to 0.30, excl 0.008 --
0.30 to 0.60, excl 0.010 (see 2.2.1.2) --
0.60 to 0.85, excl 0.012 (see 2.2.1.2) --
0.85 to 1.10, excl 0.020 --
1.10 to 3.15, excl 0.02 --
3.15 to 7.80, excl 0.02 0.05
7.80 to 12.50, excl 0.038 0.08
12.50 0.05 0.10
2.2.1.1 If cold drawn wire is ordered heat treated or heat treated and pickled after cold finishing, tolerances shall be
double those of Table 6 for nominal sizes 0.024 inch (0.60 mm) and over.
2.2.1.2 For titanium and titanium alloys, tolerances for these sizes are ±0.00075 inch (0.019 mm).
2.2.1.3 For titanium and titanium alloys, the difference among the three measurements of the distance between opposite
faces of hexagons shall be not greater than one-half the size tolerance, and the difference among the four measurements of the distance between opposite faces of octagons shall be not greater than one-half the size tolerance.
2.2.1.4 Out-of-Round
Round wire shall not be out-of-round by more than one-half of the total tolerance shown in Table 6.
2.2.2 Flats
Shall be as shown in Table 7.
Table 7A - Tolerances, thickness, inch/pound units
Specified Thickness
Inch Tolerance, Inch Plus and Minus
Up to 0.029, excl 0.001 0.029 to 0.035, excl 0.0015 0.035 to 0.1875, excl 0.002 Table 7B - Tolerances, thickness, SI units
Specified Thickness Millimeters Tolerance, Millimeter Plus and Minus
Up to 0.70, excl 0.02
0.70 to 0.90, excl 0.038
0.90 to 4.75, excl 0.04
2.2.2.1 Width tolerances shall be ± 0.005 inch (0.12 mm) for nominal widths 0.0625 to 0.375 inch (1.59 to 9.53 mm),
exclusive.
2.3 Hot Finished Bars
2.3.1 Hot Rolled
2.3.1.1 Rounds and Squares
Shall be as shown in Table 8. Out-of-round is the difference between the maximum and minimum diameters of the bar, measured at the same cross section. Out-of-square is the difference in the two dimensions at the same cross section of a square bar, each dimension being the distance between opposite faces.
Table 8A - Tolerances, diameter or thickness, inch/pound units
Specified
Diameter or Thickness
Inches Tolerance, Inch
Plus
Tolerance, Inch
Minus
Out-of-Round
or Out-or-Square
Inch
0.250 to 0.3125, incl 0.005 0.005 0.008 Over 0.3125 to 0.4375, incl 0.006 0.006 0.009 Over 0.4375 to 0.625, incl 0.007 0.007 0.010 Over 0.625 to 0.875, incl 0.008 0.008 0.012 Over 0.875 to 1.000, incl 0.009 0.009 0.013 Over 1.000 to 1.125, incl 0.010 0.010 0.015 Over 1.125 to 1.250, incl 0.011 0.011 0.016 Over 1.250 to 1.375, incl 0.012 0.012 0.018 Over 1.375 to 1.500, incl 0.014 0.014 0.021 Over 1.500 to 2.000, incl 1/64 1/64 0.023 Over 2.000 to 2.500, incl 1/32 0 0.023 Over 2.500 to 3.500, incl 3/64 0 0.035 Over 3.500 to 4.500, incl 1/16 0 0.046 Over 4.500 to 5.500, incl 5/64 0 0.058 Over 5.500 to 6.500, incl 1/8 0 0.070 Over 6.500 to 8.000, incl 5/32 0 0.085
Table 8B - Tolerances, diameter or thickness, SI units
Specified Diameter or Thickness
Millimeters Tolerance,
Millimeters
Plus
Tolerance, Millimeter
Minus
Out-of-Round
or Out-or-Square
Millimeters
6.25 to
7.80, incl 0.12 0.12 0.20
Over 7.80 to 11.00, incl 0.15 0.15 0.22 Over 11.00 to 15.75, incl 0.18 0.18 0.25 Over 15.75 to 22.00, incl 0.20 0.20 0.30 Over 22.00 to 25.00, incl 0.22 0.22 0.32 Over 25.00 to 28.00, incl 0.25 0.25 0.38 Over 28.00 to 31.00, incl 0.28 0.28 0.40 Over 31.00 to 34.00, incl 0.30 0.30 0.45 Over 34.00 to 37.50, incl 0.35 0.35 0.52 Over 37.50 to 50.00, incl 0.40 0.40 0.58 Over 50.00 to 62.50, incl 0.80 0 0.58 Over 62.50 to 87.50, incl 1.20 0 0.88 Over 87.50 to 115.00 incl 1.60 0 1.15 Over 115.00 to 138.00 incl 2.00 0 1.45 Over 138.00 to 165.00 incl 3.15 0 1.75 Over 165.00 to 200.00, incl 3.90 0 2.12 2.3.1.2 Hexagons and Octagons
Shall be as shown in Table 9.
Table 9A - Tolerances, thickness, inch/pound units
Specified Thickness
Inches Tolerance, Inch
Plus and Minus
Maximum Difference
3 Measurements
Hexagons Only
Inch
0.250 to 0.500, incl 0.007 0.011 Over 0.500 to 1.000, incl 0.010 0.015 Over 1.000 to 1.500, incl 0.021 0.025 Over 1.500 to 2.000, incl 1/32 1/32 Over 2.000 to 2.500, incl 3/64 3/64 Over 2.500 to 3.500, incl 1/16 1/16
Table 9B - Tolerances, thickness, SI units
Specified Thickness Millimeters Tolerance, Millimeters
Plus and Minus
Maximum Difference
3 Measurements
Hexagons Only
Millimeters
6.25 to 12.50, incl 0.18 0.28 Over 12.50 to 25.00, incl 0.25 0.38 Over 25.00 to 3
7.50, incl 0.52 0.62 Over 37.50 to 50.00, incl 0.78 0.78 Over 50.00 to 62.50, incl 1.18 1.18 Over 62.50 to 87.50, incl 1.56 1.56
Shall be as shown in Tables 10 and 11.
Table 10A - Tolerances, thickness, inch; for thickness ranges, inches, inch/pound units
Specified Width,
Inches 0.125 to
0.500,
incl
Plus &
Minus
Over
0.500 to
1.000,
incl
Plus &
Minus
Over
1.000 to
2.000,
incl
Plus &
Minus
Over
2.000 to
4.000,
incl
Plus
Over
2.000 to
4.000,
incl
Minus
Over
4.000 to
6.000,
incl
Plus
Over
4.000 to
6.000,
incl
Minus
Over
6.000 to
8.000,
incl
Plus
Over
6.000 to
8.000,
incl
Minus
Up to 1.000, incl 0.008 0.010 - - - - - - - Over 1.000 to 2.000, incl 0.012 0.015 0.031 - - - - - - Over 2.000 to 4.000, incl 0.015 0.020 0.031 0.062 0.031 - - - - Over 4.000 to 6.000, incl 0.015 0.020 0.031 0.062 0.031 0.093 0.062 - - Over 6.000 to 8.000, incl 0.016 0.025 0.031 0.062 0.031 0.093 0.062 0.125 0.156 Over 8.000 to 10.000, incl 0.021 0.031 0.031 0.062 0.031 0.093 0.062 0.125 0.156 Table 10B - Tolerances, thickness, millimeters; for thickness ranges, millimeters, SI units
Specified Width, Millimeters 3.10 to
12.50,
incl
Plus &
Minus
Over
12.50 to
25.00,
incl
Plus &
Minus
Over
25.00 to
50.00,
incl
Plus &
Minus
Over
50.00 to
100.00,
incl
Plus
Over
50.00 to
100.00,
incl
Minus
Over
100.00 to
150.00,
incl
Plus
Over
100.00 to
150.00,
incl
Minus
Over
150.00 to
200.00,
incl
Plus
Over
150.00 to
200.00,
incl
Minus
Up to 25.00, incl 0.20 0.25 - - - - - - - Over 25.00 to 50.00, incl 0.30 0.38 0.78 - - - - - - Over 50.00 to 100.00, incl 0.38 0.50 0.78 1.55 0.78 - - - - Over 100.00 to 150.00, incl 0.38 0.50 0.78 1.55 0.78 2.32 1.55 - - Over 150.00 to 200.00, incl 0.40 0.62 0.78 1.55 0.78 2.32 1.55 3.12 3.90 Over 200.00 to 250.00, incl 0.52 0.78 0.78 1.55 0.78 2.32 1.55 3.12 3.90
Table 11A - Tolerances, width, inch/pound units
Specified Width,
Inches Tolerance, Inch
Plus
Tolerance, Inch
Minus
Up to 1.000, incl 0.015 0.015 Over 1.000 to 2.000, incl 0.031 0.031 Over 2.000 to 4.000, incl 0.062 0.031 Over 4.000 to 6.000, incl 0.093 0.062 Over 6.000 to 8.000, incl 0.125 0.156 Over 8.000 to 10.000, incl 0.156 0.187 Table 11B - Tolerances, width, SI units
Specified Width, Millimeters Tolerance,
Millimeters
Plus
Tolerance,
Millimeters
Minus
Up to 25.00, incl 0.38 0.38 Over 25.00 to 50.00, incl 0.78 0.78 Over 50.00 to 100.00, incl 1.55 0.78 Over 100.00 to 150.00, incl 2.32 1.55 Over 150.00 to 200.00, incl 3.12 3.90 Over 200.00 to 250.00, incl 3.90 4.68
Tolerances shall be as agreed upon by purchaser and producer.
3. LENGTH
Tolerances in Table 12 and Table 13 shall apply only when exact lengths are ordered.
3.1 Hot or Cold Finished Bars
Shall be as shown in Table 12.
Table 12A - Tolerances, length, inches, plus only;
for length ranges, feet, inch/pound units
Specified
Diameter of Rounds,
Thickness of Squares,
Hexagons, and Octagons, Width of Flats
Inches
Length
Up to 12 feet,
Incl (inches)
Length
Over 12 to 25 feet,
Incl (inches)
Up to 2.000, incl 1/2 3/4 Over 2.000 to 4.000, incl 3/4 1 Over 4.000 to 6.000, incl 1 1-1/4 Over 6.000 to 9.000, incl 1-1/4 1-1/2 Over 9.000 to 12.000, incl 1-1/2 2 Table 12B - Tolerances, length, millimeters, plus only;
for length ranges, millimeters, SI units
Specified
Diameter of Rounds,
Thickness of Squares,
Hexagons, and Octagons, Width of Flats
Millimeters
Length
Up to 3600,
Incl
Length
Over 3600 to 7500,
Incl
Up to 50.00, incl 12.5 19.0
Over 50.00 to 100.00, incl 19.0 25.0
Over 100.00 to 150.00, incl 25.0 31.0
Over 150.00 to 225.00, incl 31.0 37.5
Over 225.00 to 300.00, incl 37.5 50.0 3.2 Wire
3.2.1 Round and Shape, Straightened and Cut, Exact Length Resheared
Shall be as shown in Table 13.
Table 13A - Tolerances, length, inch, plus only;
for length ranges, feet, inch/pound units
Specified
Diameter of Rounds,
Thickness of Squares, Hexagons, and Octagons,
Inches
Length
Up to 3 feet,
Excl (inches)
Length
3 to 12 feet,
Incl (inches)
Length
Over 12 to 25 feet,
Incl (inches)
Up to 0.125, incl 1/16 1/16 1/8 Over 0.125 to 0.500, incl 1/32 (see 3.2.1.1) 1/16 1/8
Table 13B - Tolerances, length, millimeters, plus only;
for length ranges, millimeters, SI units Specified
Diameter of Rounds,
Thickness of Squares, Hexagons, and Octagons,
Millimeters
Length
Up to 900,
Excl
Length
900 to 3600,
Incl
Length
Over 3600 to 7500,
Incl
Up to 3.12, incl 1.6 1.6 3.1
Over 3.12 to 12.50, incl 0.8 (see 3.2.1.1) 1.6 3.1
3.2.1.1 For titanium and titanium alloys, tolerance for these sizes is +1/16 inch, -0 inch (+1.6 mm, -0 mm).
4. STRAIGHTNESS
4.1 Cold Finished
Bars shall be of such straightness that the maximum curvature (depth of arc) shall not exceed 0.0625 inch (1.59 mm) in any 5 feet (1500 mm) of length, but shall not exceed 0.0125 inch (1.04 mm) x length in feet (meters).
4.2 Hot Finished or Heat Treated
Unless otherwise ordered, bars shall be of such straightness that the maximum curvature (depth of arc) shall not exceed 0.125 inch (3.13 mm) in any 5 feet (1500 mm) of length, but shall not exceed 0.025 inch (2.08 mm) x length in feet (meters).
5. SPECIAL TOLERANCES
5.1 Across Corners, Hexagons
The requirements shown in Table 14 apply to cold finished hexagons, when specified.
Table 14A - Minimum distance across corners, inch/pound units
Specified Thickness
Inches Distance Across Corners
Inches
0.1875 0.2188 0.250 0.3125 0.375 0.210 0.245 0.280 0.351 0.423
0.4375 0.500 0.5625 0.5938 0.625 0.492 0.564 0.635 0.670 0.706
0.6875 0.750 0.8125 0.875 0.9375 0.775 0.848 0.919
0.990
1.062
1.000 1.0625 1.133 1.203
SAE INTERNATIONAL AMS2241™S Page 11 of 11
Table 14B - Minimum distance across corners, SI units
Specified Thickness Millimeters Distance Across Corners
Millimeters
4.50
5.50
6.50
8.00
9.50
11.00
12.50
14.00
15.00
16.00
17.50
19.00
20.50 22.00
24.00
25.00 27.00
5.04
6.17
7.31
8.97 10.67 12.37
14.05
15.75
16.88
18.01
19.71 21.41
23.11
24.81
27.08
28.21 30.42
6. NOTES
6.1 Revision Indicator
A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.
6.2 Terms used in AMS are clarified in ARP191
7.
6.3 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and
properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information.
PREPARED BY AMS COMMITTEE “F”。