Fastener Guide / Technical Reference

ASTM F594 Stainless Nuts

F594 is the stainless nut specification written to pair with F593 bolts. The nut alloy group and condition should match the bolt.

Last reviewed 2026-09-10 · Governing standard: ASTM F594-24; ASTM F593-24; ISO 3506-2:2020 · reference FG-7AA2D1 · Report an error on this sheet

Pairing

BoltNut
F593 Group 1 (304 family)F594 Group 1
F593 Group 2 (316 family)F594 Group 2
ISO 3506 A2 / A4 boltISO 3506 A2 / A4 nut, same class

These tables carry the same figures as the printed sheet below.

The printed sheet

ASTM F594 Stainless Nuts

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Text version of this sheet

ASTM F594 · stainless steel nuts

FIELD IDENTIFICATION

MFG

What it is

F594 is the stainless nut specification written to pair with F593 bolts. The nut alloy group and condition

should match the bolt.

Stainless hex nut; marking varies by group and

condition

Pairing

Bolt

Nut

F593 Group 1 (304 family)

F594 Group 1

F593 Group 2 (316 family)

F594 Group 2

ISO 3506 A2 / A4 bolt

ISO 3506 A2 / A4 nut, same class

Key points

Stainless on stainless galls easily. Use anti-seize, slower tightening or a different nut alloy/condition as specified.

Governing standards: ASTM F594-24; ASTM F593-24; ISO 3506-2:2020. 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-7AA2D1 · thefastenerapp.com/fastener-guide/technical-reference/astm-f594-stainless-nuts · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

Related sheets

← ASTM F593 Group 2 — 316 Family18-8 Stainless Explained →

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