ASTM F593 Stainless Bolts Overview
F593 is the ASTM specification for inch stainless bolts, screws and studs. Alloy group and condition together set the strength.
Alloy groups
| Group | Typical alloys |
|---|---|
| 1 | 303, 304, 304L, 305 (18-8 family) |
| 2 | 316, 316L |
| 3 | 321, 347 |
| 4 | 430 |
| 5 | 410, 416 |
| 6 | 630 (17-4 PH) |
Conditions
| Code | Meaning |
|---|---|
| AF | Annealed and formed (lowest strength) |
| A | Annealed after forming |
| CW | Cold worked (common commercial) |
| SH | Strain hardened (higher strength) |
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 · stainless bolts overview
What it is
FIELD IDENTIFICATION
F593 is the ASTM specification for inch stainless bolts, screws and studs. Alloy group and condition
together set the strength.
MFG
F593*
Marking varies by alloy group and condition
Alloy groups
Group
Typical alloys
1
303, 304, 304L, 305 (18-8 family)
2
316, 316L
3
321, 347
4
430
5
410, 416
6
630 (17-4 PH)
Conditions
Code
Meaning
AF
Annealed and formed (lowest strength)
A
Annealed after forming
CW
Cold worked (common commercial)
SH
Strain hardened (higher strength)
Key points
Strength falls as diameter grows within a condition.
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-B0AB69 · thefastenerapp.com/fastener-guide/technical-reference/astm-f593-stainless-bolts-overview · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.
