Fastener Guide / Technical Reference

Weathering Steel Type 3 Fasteners

Weathering steel rusts into a stable, protective layer. Type 3 fasteners are made from weathering steel so they match it: bolt, nut and washer are bought as a Type 3 set.

Last reviewed 2026-09-10 · Governing standard: ASTM F3125/F3125M-26; ASTM A563/A563M-26; ASTM F436 · reference FG-F1B004 · Report an error on this sheet

The Type 3 set

ComponentSpecificationMarking
BoltF3125 A325 / A490 Type 3Grade symbol underlined
NutASTM A563 C3 or DH3C3 / DH3
WasherASTM F436 Type 3F436 + 3

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

The printed sheet

Weathering Steel Type 3 Fasteners

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Text version of this sheet

ASTM F3125 Type 3 · weathering steel structural fasteners

What it is

FIELD IDENTIFICATION

Weathering steel rusts into a stable, protective layer. Type 3 fasteners are made from weathering steel

so they match it: bolt, nut and washer are bought as a Type 3 set.

MFG

A325

Type 3 weathering: grade symbol underlined

The Type 3 set

Component

Specification

Marking

Bolt

F3125 A325 / A490 Type 3

Grade symbol underlined

Nut

ASTM A563 C3 or DH3

C3 / DH3

Washer

ASTM F436 Type 3

F436 + 3

Key points

Plain Type 1 bolts in a weathering frame rust through instead of stabilizing.

Galvanized or stainless fasteners in weathering steel create a mismatch unless isolated.

Governing standards: ASTM F3125/F3125M-26; ASTM A563/A563M-26; ASTM F436. 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-F1B004 · thefastenerapp.com/fastener-guide/technical-reference/weathering-steel-type-3-fasteners · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

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