ASTM F593 Stainless Steel Bolts, Hex Cap Screws, and Studs

ASTM F593 Specifications for Stainless Steel Bolts, Hex Cap Screws, and Studs

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Mechanical Test Requirements for Bolts and Studs A

A Where options are given, all the tests under an option shall be performed. Option A, Option B, and Option C indicates manufacturer may perform all Option A (full-size), all Option B (machined specimen), or all Option C tests whichever is preferred. Option A tests should be made whenever feasible.
B Tests that are not mandatory.
C Special fasteners are those fasteners with special configurations including drilled heads, reduced body, etc., that are weaker than the threaded section. Special fasteners having full-size heads shall be tested as specified for studs and other bolts.


Tensile Stress Areas and Threads per Inch

Nominal Size, in. ( D) Coarse Threads–UNC Fine Threads-UNF Thread Series–8 UN
Threads/in. Stress Area A, in.2 Threads/in. Stress Area A, in.2 Threads/in. Stress Area A,
in.2
1⁄4 (0.250) 20 0.0318 28 0.0364 . . . . . .
5⁄16 (0.3125) 18 0.0524 24 0.0580 . . . . . .
3⁄18 (0.375) 16 0.0775 24 0.0878 . . . . . .
7⁄16 (0.4375) 14 0.1063 20 0.1187 . . . . . .
1⁄2 (0.500) 13 0.1419 20 0.1599 . . . . . .
9⁄16 (0.5625) 12 0.1820 18 0.2030 . . . . . .
5⁄8 (0.625) 11 0.2260 18 0.2560 . . . . . .
3⁄4 (0.750) 10 0.3340 16 0.3730 . . . . . .
7⁄8 (0.875) 9 0.4620 14 0.5090 . . . . . .
1 8 0.6060 12 0.6630 . . . . . .
1-1⁄8 (1.125) 7 0.7630 12 0.8560 8 0.790
1-1⁄4 (1.250) 7 0.9690 12 1.0730 8 1.000
1-3⁄8 (1.375) 6 1.1550 12 1.3150 8 1.233
1-1⁄2 (1.500) 6 1.4050 12 1.5810 8 1.492
A Tensile stress areas are computed using the following formula: As = 0.7854(D - 0.9743/n)2
where:
As = tensile stress area, in.2,
D = nominal size (basic major diameter), in.,
n = number of threads per inch.

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