AEROSPACE
MATERIAL
SPECIFICATION
AMS 2261G
Issued
Revised
Reaffirmed
MAY 1948
MAR 2002
OCT 2006
Superseding AMS 2261F
Tolerances
Nickel, Nickel Alloy, and Cobalt Alloy Bars, Rods, and Wire
RATIONALE
This document has been reaffirmed to comply with the SAE 5-year Review policy.
1. SCOPE:
This specification covers established manufacturing tolerances applicable to bars, rods, and wire of
nickel, nickel alloy, and cobalt alloys ordered to inch-pound dimensions. These tolerances apply to all
conditions, unless otherwise noted. The term "excl" is used to apply only to the higher figure of a
specified range.
1.1
Where the terms “nickel”, “nickel-copper”, “nickel-chromium”, “nickel-molybdenum”, “nickelmolybdenum-chromium”, and “cobalt” are used without qualification, they refer to both non-heattreatable and heat-treatable alloys as applicable, unless otherwise noted.
1.2
MAM 2261 is the metric version of this AMS.
2. DIAMETER OR 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
2.1.1
Cold Reduced:
Nickel and Nickel-Copper Alloys:
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AMS 2261G
2.1.1.1
SAE
AMS 2261G
Rounds:
TABLE 1
Tolerance,
Inch
Minus Only
Specified Diameters
Inches
Over
Over
Over
Over
Over
2.1.1.2
0.062
0.188
0.500
0.938
1.938
2.500
3.000
3.500
to
to
to
to
to
to
to
to
0.188, excl
0.500, excl
0.938, incl
1.938, incl
2.500, incl
3.000, incl
3.500, incl
4.000, incl
0.002
0.003
0.002
0.003
0.004
0.005
0.006
0.007
Hexagons, Squares, and Rectangles:
TABLE 2
Specified Distance
Between Parallel Sides
Inches
Over
Over
Over
Over
2.1.2
2.1.2.1
0.062
0.188
0.938
1.500
2.500
2.750
to
to
to
to
to
to
Tolerance,
Inch
Minus Only
0.188, excl
0.938, incl
1.500, incl
2.500, incl
2.750, incl
4.000, incl
0.002
0.003
0.004
0.005
0.006
0.007
Nickel-Chromium Alloys: The tolerances of Table 3 and Table 4 do not apply to heat-treatable
nickel-chromium alloys 0.500 inch and over in specified dimensions.
Rounds:
TABLE 3
Specified Diameters
Inches
0.062
0.188
0.500
Over 0.938
Over 1.938
to
to
to
to
to
0.188,
0.500,
0.938,
1.938,
2.500,
Tolerance,
Inch
Plus
Tolerance,
Inch
Minus
0.000
0.000
0.001
0.0015
0.002
0.002
0.003
0.002
0.003
0.004
excl
excl
incl
incl
incl
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AMS 2261G
2.1.2.2
SAE
AMS 2261G
Hexagons, Squares, and Rectangles:
TABLE 4
Specified Distance
Between Parallel Sides
Inch
Tolerance,
Inch
Minus Only
0.062 to 0.188, excl
0.188 to 0.500, incl
2.2
0.002
0.003
Hot Finished:
2.2.1
2.2.1.1
Nickel, Nickel-Copper, and Nickel-Chromium Alloys:
Rounds, Hexagons, Squares, and Rectangles: The tolerances of Table 5 are not applicable to
heat-treatable nickel-chromium alloy rounds and hexagons, hot-rolled sections over 4 inches, or
forged sections of all sizes. See Table 6 for tolerances of heat-treatable nickel-chromium alloy
rounds.
TABLE 5
2.2.1.2
Specified Dimensions
Inches
Tolerance,
Inch
Plus
Tolerance,
Inch
Minus
Up to 1.0, incl
Over 1.0 to 2.0, incl
Over 2.0 to 4.0, incl
Over 4.0
0.016
0.031
0.047
0.125
0.016
0.016
0.031
0.063
Ground or Turned Rounds: Rounds under 1.0 inch in specified diameter are generally ground;
larger diameters are generally turned.
TABLE 6
Specified Diameter
Inches
Tolerance,
Inch
Plus
Tolerance,
Inch
Minus
Up to 1.0, excl
1.0 and over
0.005
0.031
0.005
0.000
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AMS 2261G
2.2.2
2.2.2.1
SAE
AMS 2261G
Nickel-Molybdenum, Nickel-Molybdenum-Chromium, and Cobalt Alloys:
Rounds: Rounds 0.750 to 3.500 inches, inclusive, in specified diameter are ground or turned.
TABLE 7
2.2.2.2
Specified Diameter
Inches
Tolerance,
Inch
Plus
Tolerance,
Inch
Minus
0.312 to 0.438, incl
Over 0.438 to 0.625, incl
Over 0.625 to 0.750, excl
0.750 to 3.500, incl
0.012
0.014
0.016
0.010
0.012
0.014
0.016
0.000
Thickness of Squares and Rectangles: Tolerances shown for lengths over 90 inches apply to all
rectangles having a width greater than 3 times the thickness, regardless of length, and to all
vacuum melted alloys regardless of length.
TABLE 8
Specified Thickness
Inches
Specified Width
Inches
Thickness
Tolerance,
Inch, for
Lengths
of
90 Inches
and
Under
Plus
0.750 to 1.500, incl
Over 1.500 to 3.000, incl
Over 3.000
0.750 to 6.000, incl
Over 1.500 to 6.000, incl
Over 3.000
0.031
0.125
0.250
2.2.2.3
Thickness
Tolerance,
Inch, for
Lengths
of
90 Inches
and
Under
Minus
Thickness
Tolerance,
Inch, for
Lengths
of
Over 90
Inches
Plus
Thickness
Tolerance,
Inch, for
Lengths
of
Over 90
Inches
Minus
0.031
0.063
0.000
0.125
0.125
0.250
0.063
0.063
0.000
Width of Rectangles: Tolerances shown for lengths over 90 inches apply to all rectangles having
a width greater than 3 times the thickness, regardless of length, and to all vacuum melted alloys
regardless of length.
-4-
AMS 2261G
SAE
AMS 2261G
TABLE 9
Specified Width
Inches
Specified Thickness
Inches
Width
Tolerance,
Inch, for
Lengths of
90 Inches
and Under
Plus
0.750 to 3.500, incl
Over 3.500 to 6.000, incl
Over 1.500 to 6.000, incl
Over 3.000
0.750 to 1.500, incl
0.750 to 1.500, incl
Over 1.500 to 3.000, incl
Over 3.000
0.031
0.125
0.125
0.250
Width
Tolerance,
Inch, for
Lengths of
90 Inches
and Under
Minus
Width
Tolerance,
Inch, for
Lengths of
Over
90 Inches
Plus
Width
Tolerance,
Inch, for
Lengths of
Over
90 Inches
Minus
0.031
0.063
0.063
0.000
0.125
0.125
0.125
0.250
0.063
0.063
0.063
0.000
3. LENGTH:
3.1
Nickel, Nickel-Copper, and Nickel-Chromium Alloys:
Definite lengths shall vary not more than +0.125 inch, -0 for sizes 8 inches and under in specified
diameter or distance between parallel sides, and not more than +0.250 inch, -0 for larger sizes.
3.2
Nickel-Molybdenum, Nickel-Molybdenum-Chromium, and Cobalt Alloys:
Definite lengths shall vary not more than +0.063 inch, -0 for rounds 2 inches and under in specified
diameter, and not more than +0.125 inch, -0 for larger rounds and for all sizes of squares and
rectangles.
4. STRAIGHTNESS:
-5-
AMS 2261G
SAE
AMS 2261G
TABLE 10
Alloys
Condition,
Form, and
Size
Maximum Curvature, Inch,
(Depth of Chord)
in Any Foot of Length
COLD REDUCED
Ni, Ni-Cu
Rounds, all sizes
0.006
Ni-Cr (Non-Heat Treatable)
Rounds, all sizes
0.009
Ni-Cr (Heat Treatable)
All Forms, under 1/2 inch
0.009
Ni, Ni-Cu
Hexagons, squares,
rectangles, all sizes
0.025
HOT FINISHED
Ni, Ni-Cu, Ni-Cr
All forms, all sizes
0.050
Ni-Mo, Ni-Mo-Cr, and Co
Rounds, all sizes
Squares and rectangles,
all sizes
0.025
0.50
HOT FINISHED, GROUND OR TURNED
Ni, Ni-Cu, Ni-Cr
Rounds, all sizes
0.025
5. FLATNESS:
No requirement.
6. OTHER TOLERANCES:
6.1
Out-of-Roundness:
Rounds shall not be out-of-round by more than the amounts specified in 6.1.1 and 6.1.2.
6.1.1
Nickel, Nickel-Copper, and Nickel-Chromium Alloys: 50% of the total spread permitted by Tables 1,
2, 3, 4, 5, or 6 as applicable, except for hot finished rounds 0.500 inch and under in specified
diameter (Table 5), for which total spread is permitted.
6.1.2
Nickel-Molybdenum, Nickel-Molybdenum-Chromium, and Cobalt Alloys: 75% of the total spread
permitted by Table 7.
6.2
6.2.1
Hot Finished Bars:
Machining Allowances: For squares and rectangles, and for cast billets of any shape which are to
be machined to size, the machining allowances (including allowances for out-of-straightness)
necessary to clean up the hot finished surfaces shall be as agreed upon by purchaser and vendor.
-6-
AMS 2261G
SAE
AMS 2261G
7. NOTES:
7.1
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 specification.
An (R) symbol to the left of the document title indicates a complete revision of the specification,
including technical revisions. Change bars and (R) are not used in original publications, nor in
specifications that contain editorial changes only.
PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE "F"
-7-