ASME B18.3 — Socket Cap, Shoulder, Set Screws, and Hex Keys

ASME B18.3 is the dimensional standard for socket head cap screws, shoulder screws, set screws, and the hex keys that drive them.

What It Covers

• Socket head cap screw dimensions
• Button and flat socket heads
• Shoulder screw sizes
• Set screw points and hex keys

Related Fasteners

• Socket Head Cap Screw
• Set Screw
• Shoulder Bolt
• Security Screw