Button Head Socket Screws
Button head socket screws have a low, rounded head with a hex socket. They are chosen for appearance and low profile, not for maximum load.
Button head vs socket head cap
| Button head | Socket head cap | |
|---|---|---|
| Head height | Low dome | Tall cylinder |
| Load rating | Lower | Higher |
| Typical strength | Inch alloy: ASTM F835; metric: commonly 10.9 | Inch A574; metric 12.9 |
| Drive | Smaller hex key | Larger hex key |
These tables carry the same figures as the printed sheet below.
The printed sheet
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Text version of this sheet
ISO 7380 · ASME B18.3 · button head socket screws
What it is
FIELD IDENTIFICATION
Button head socket screws have a low, rounded head with a hex socket. They are chosen for
appearance and low profile, not for maximum load.
Low domed head, hex socket drive
Button head vs socket head cap
Button head
Socket head cap
Head height
Low dome
Tall cylinder
Load rating
Lower
Higher
Typical strength
Inch alloy: ASTM F835; metric: commonly 10.9
Inch A574; metric 12.9
Drive
Smaller hex key
Larger hex key
Key points
Do not substitute a button head where a socket head cap screw was specified for load.
The small socket strips more easily; use the right key and torque.
Governing standards: ISO 7380; ASME B18.3-2012; ASTM F835-23. 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-768382 · thefastenerapp.com/fastener-guide/technical-reference/button-head-socket-screws · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.
