ASTM F593 Specifications

Technical Menu Posted on July 1st, 2015 by vapro

This specification for ASTM F593 covers the requirements for stainless steel bolts, hex cap screws, and studs 0.25 to 1.50 in., inclusive, in nominal diameter in a number of alloys in common use and intended for service applications requiring general corrosion resistance.

Group Alloy Grades Condition Family Type
1 304,305,384,304L,XM1,18-9LW, 302HQD Cold Worked ( CW ) Austenitic
2 316, 316 L Cold Worked ( CW ) Austenitic
3 321, 347 Cold Worked ( CW ) Austenitic
4 430E Cold Worked ( CW ) Ferritic
5 410F Hardened & Tempered ( H ) Martensitic
6 431 Hardened & Tempered ( H ) Martensitic
7 630 Age Hardened ( AH ) Precipitation Hardening

* Unless otherwise specified on the inquiry and order, the choice of an alloy from within a group shall be at the discretion of the fastener manufacturer

* Sizes 0.75 in. and larger may be hot worked and solution annealed.

* When approved by the purchaser, Alloys 303, 303Se, or XM1 may be furnished.

* When approved by the purchaser, Alloy 430F may be furnished.

* When approved by the purchaser, Alloys 416 or 416Se may be furnished.

Chemical Composition

Element Group 1 ( AISI 304 ) Group 2 ( AISI 316 )
Carbon 0.08% 0.08%
Manganese, min 2.00% 2.00%
Phosphorus, max 0.045% 0.045%
Sulfur, max 0.030% 0.030%
Silicon 1.00% 1.00%
Chromium 18.0 to 20.0% 16.0 to 18.0%
Nickel 8.0 to 10.5% 10.0 to 14.0%
Copper 1.00%
Molybdenum 2.00 to 3.00%

Mechanical Requirements

Alloy Group Condition Marking Diameter Range Tensile, ksi Yield, ksi min Rockwell Hardness
1 AF F593A 1/4 to 1-1/2 65 to 85 20 B85 max
A F593B 1/4 to 1-1/2 75 to 100 30 B65 to 95
CW1 F593C 1/4 to 5/8 100 to 150 65 B95 to C32
CW2 F593D 3/4 to 1-1/2 85 to 140 45 B80 to C32
2 AF F593E 1/4 to 1-1/2 65 to 85 20 B85 max
A F593F 1/4 to 1-1/2 75 to 100 30 B65 to 95
CW1 F593G 1/4 to 5/8 100 to 150 65 B95 to C32
CW2 F593H 3/4 to 1-1/2 85 to 140 45 B80 to C32

Recommended Nuts: F594

Recommended Washers: SS304 / SS316

Related: ASTM F593 Specifications on ASTM.org

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