ASTM F593 Group 2 — 316 Family
F593 Group 2 is how you buy 316-family stainless bolting as a certified ASTM product rather than a box labeled 316.
Common cold-worked condition marks
| Mark | Alloy group | Condition |
|---|---|---|
| F593C | Group 1 (304 family) | CW1 |
| F593D | Group 1 (304 family) | CW2 |
| F593G | Group 2 (316 family) | CW1 |
| F593H | Group 2 (316 family) | CW2 |
CW1 = 1/4 - 5/8 in (100 ksi min); CW2 = 3/4 - 1-1/2 in (85 ksi min). Verify against the marking table in the current F593.
These tables carry the same figures as the printed sheet below.
The printed sheet
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Text version of this sheet
ASTM F593 · Group 2 · 316-family stainless bolts, screws and studs
What it is
FIELD IDENTIFICATION
F593 Group 2 is how you buy 316-family stainless bolting as a certified ASTM product rather than a
box labeled 316.
MFG
316*
Alloy/condition marking varies; verify F593
designation
Common cold-worked condition marks
Mark
Alloy group
Condition
F593C
Group 1 (304 family)
CW1
F593D
Group 1 (304 family)
CW2
F593G
Group 2 (316 family)
CW1
F593H
Group 2 (316 family)
CW2
CW1 = 1/4 - 5/8 in (100 ksi min); CW2 = 3/4 - 1-1/2 in (85 ksi min). Verify against the marking table in the current F593.
Key points
The mark tells you group and condition, not just the alloy.
Pair with ASTM F594 nuts of the same alloy group.
Governing standards: ASTM F593-24; ASTM F594-24. Editions shown are the latest confirmed as of September 2026. The drawing and the governing standard always take
precedence over this sheet.
torquing any fastener. Verify the current governing standard, project documents, OEM requirements, size, thread, coating and lot certification. To the fullest extent permitted by law, The Fastener App disclaims liability
arising from reliance on this reference.
Fastener Guide reference FG-06AF77 · thefastenerapp.com/fastener-guide/technical-reference/astm-f593-group-2-316-family · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.
