5/8-18 Flat Head Socket Cap Screws

5/8"-18 flat head socket cap screws in SAE fine (UNF) thread, made from heat treated alloy steel with a black oxide finish. We stock 1-1/4", 1-1/2", 1-3/4", 2", 2-1/4", 2-1/2", 3" lengths. They take a 3/8" hex key. Length is measured overall, including the head.

Specifications

Size: 5/8"-18 (SAE fine)
Lengths: 1-1/4", 1-1/2", 1-3/4", 2", 2-1/4", 2-1/2", 3"
Hex key: 3/8"
Tap drill: 37/64"
Material: alloy steel, ASTM F835
Finish: black oxide
Strength: 135,000 psi minimum tensile strength (ASTM F835)
Head: 82° countersunk

Common Uses

Flush mounting
Machine plates and slides
Fixtures

FAQ

What hex key fits a 5/8"-18 flat head socket cap screw?
A 3/8" hex key (Allen wrench).

What tap drill do I use for 5/8"-18?
Use a 37/64" drill for a standard 75% thread.

Are button head socket screws as strong as socket head cap screws?
No. Button and flat head socket cap screws are made to ASTM F835, with a minimum tensile strength of 145,000 psi in 1/2" and smaller and 135,000 psi over 1/2". Their smaller socket also takes less torque, so use a socket head cap screw for high loads.

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