ASTM A449 Bolts
A449 covers quenched-and-tempered steel bolts and studs for general engineering use, in larger sizes than SAE J429 covers. Strength steps down with diameter.
| Marking | 3 radial lines 120 deg; may also carry A449 and maker ID |
|---|---|
| Matching nut | Per ASTM A563 as specified |
| Typical use | Anchor bolts, studs, equipment and general high-strength work |
Mechanical properties (ASTM A449, Type 1)
| Size | Proof | Yield (min) | Tensile (min) |
|---|---|---|---|
| 1/4 to 1 in | 85 ksi | 92 ksi | 120 ksi |
| over 1 to 1-1/2 in | 74 ksi | 81 ksi | 105 ksi |
| over 1-1/2 to 3 in | 55 ksi | 58 ksi | 90 ksi |
These tables carry the same figures as the printed sheet below.
The printed sheet
See an error on this sheet?
Tell us what is wrong.
Text version of this sheet
ASTM A449 · quenched and tempered steel bolts and studs
What it is
FIELD IDENTIFICATION
A449 covers quenched-and-tempered steel bolts and studs for general engineering use, in larger sizes
than SAE J429 covers. Strength steps down with diameter.
MFG
MFG
3 LINES
A449
OR STAMPED
Marking
3 radial lines 120 deg; may also carry A449 and maker ID
Matching nut
Per ASTM A563 as specified
Typical use
Anchor bolts, studs, equipment and general high-strength work
Either marking may appear - both are A449
Mechanical properties (ASTM A449, Type 1)
Size
Proof
Yield (min)
Tensile (min)
1/4 to 1 in
85 ksi
92 ksi
120 ksi
over 1 to 1-1/2 in
74 ksi
81 ksi
105 ksi
over 1-1/2 to 3 in
55 ksi
58 ksi
90 ksi
Key points
A three-line head can be A449 or SAE Grade 5. Check the maker mark, size and certs.
A449 is not an F3125 structural bolt and is not installed under structural bolting rules.
Governing standards: ASTM A449-14(2020); ASTM A563/A563M-26 (nuts). 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-7C0B2F · thefastenerapp.com/fastener-guide/technical-reference/astm-a449-bolts · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.
