Fastener Guide / Technical Reference

ASTM A307 Grade A Bolts

A307 Grade A is low-carbon steel bolting for general construction and fabricated assemblies. It is a 60 ksi part, not a high-strength structural bolt.

Last reviewed 2026-09-10 · Governing standard: ASTM A307-21; ASTM A563/A563M-26 · reference FG-889E2E · Report an error on this sheet

Marking307A plus maker ID when marked; much stock carries maker ID only
NutASTM A563 Grade A, hex or heavy hex
WasherUSS or SAE flat

Mechanical properties (ASTM A307)

GradeSizeTensileHardness
A1/4 to 4 in60 ksi minB69 - B100
B1/4 to 4 in60 - 100 ksiB69 - B95

Grade C was withdrawn in 2007; use ASTM F1554 Grade 36 for anchor rods.

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

The printed sheet

ASTM A307 Grade A Bolts

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Text version of this sheet

ASTM A307 · Grade A · carbon steel bolts and studs

What it is

FIELD IDENTIFICATION

A307 Grade A is low-carbon steel bolting for general construction and fabricated assemblies. It is a 60

ksi part, not a high-strength structural bolt.

MFG

307A

Marking

307A plus maker ID when marked; much stock carries maker ID only

Nut

ASTM A563 Grade A, hex or heavy hex

Washer

USS or SAE flat

Marked 307A + manufacturer ID

Mechanical properties (ASTM A307)

Grade

Size

Tensile

Hardness

A

1/4 to 4 in

60 ksi min

B69 - B100

B

1/4 to 4 in

60 - 100 ksi

B69 - B95

Grade C was withdrawn in 2007; use ASTM F1554 Grade 36 for anchor rods.

Key points

A plain head can be A307, Grade 2 or unknown. Buy to the spec and ask for certs when it matters.

What it is not

Not an A325 substitute. A307 is not used in slip-critical or pretensioned structural joints.

Governing standards: ASTM A307-21; ASTM A563/A563M-26. 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-889E2E · thefastenerapp.com/fastener-guide/technical-reference/astm-a307-grade-a-bolts · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

Related sheets

← SAE Grade 2 vs 5 vs 8ASTM A307 Grade B Bolts →

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