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Page Title:
Table III. Tolerance on diameter |
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|  MIL-T-50777A(OS)
3.2.2.1 Pressure. Each length of round tube shall withstand an air pressure of 250 psi applied
to the inside of the tube for not less than 5 seconds while immersed (see 4.3.4.1).
3.2.2.2 Electromagnetic (eddy current). Each length of tube having a maximum wall thickness
of 0.083 inch shall produce eddy current indications less than those from the 2A holes of the
applicable reference standard of ASTM E 215 or an equivalent secondary standard when tested in
accordance with 4.3.4.2.
3.3 Tolerances.
3.3.1 Diameter. The tolerance on diameter shall be as shown in table III.
TABLE III. Tolerance on diameter.
Allowable deviation of diameter at any
1
point from specified diameter, inches2
Specified diameter, inches
0.501 - 1.000
+ 0.008
1.001 - 2.000
+ 0.010
2.001 - 3.000
+ 0.012
1
When outside diameter, inside diameter, and wall thickness are all specified, standard
tolerances are applicable to any two of these dimensions, but not to all three. When both
outside and inside diameter are specified, tolerances applicable to the outside diameter
dimension shall apply to both the outside and inside diameter.
2
Not applicable to tube having a wall thickness less than 0.020 inch or less than 2.5 percent
of the outside diameter.
3.3.2 Wall thickness. The wall-thickness tolerance (see 6.3.1) for wall thickness of 0.050 to
0.500 inch shall be + 10 percent of the wall thickness. The mean wall thickness shall be the
average of two measurements taken opposite each other.
3.3.3 Straightness. The straightness tolerance for outside diameter of 0.500 inch to 3.000
inches, measured as departure of the tube from the straight edge, shall be 0.010 inch per foot of
length.
3.3.4 Length. The tolerances on length for outside diameter of 0.500 inch to 3.000 inches shall
be: + 1/8 inch for lengths up to 12 feet; + 1/4 inch for lengths over 12 feet and up to 30 feet; + 3/8
inch for lengths over 30 feet and up to 50 feet; and + 1 inch for lengths over 50 feet.
4
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