ASME B18.3 Socket cap, shoulder and set screws, hex keys (inch)

Is ASME B18.3 still current?

Yes. ASME B18.3-2026 is the latest edition MechAtlas found (MechAtlas review: 27 October 2026). Check the publisher for amendments before you specify it.

What it covers

Inch socket head screws, set screws and keys.

Parts that use ASME B18.3

• Socket head cap screw (USA (ASME / ASTM), main)
  Screw with a round head and hexagon socket, used where space is tight or the head must sit in a counterbore.
  Inch socket cap, shoulder and set screws, hex keys.
• Set screw (grub screw) (USA (ASME / ASTM), main)
  Headless screw with a hexagon socket, used to lock a hub, pulley or collar onto a shaft.
  Inch socket set screws are in this standard.
• Countersunk head screw (USA (ASME / ASTM), related)
  Screw with a cone-shaped head that sits flush in a countersunk hole; socket or slotted drive.
  Inch socket screws family; confirm flat-head scope in your edition.

Official source

MechAtlas does not reproduce standards. Check the official edition at the publisher's page for ASME B18.3 or the ASME store.

Other fasteners & threads standards

• DIN 125-1 Replaced
  Washers, product grade A, up to 250 HV
• DIN 1481 Replaced
  Heavy spring pins (old)
• DIN 2999-1 Replaced
  Whitworth pipe threads (old)
• DIN 6325 Replaced
  Hardened parallel pins m6 (old)
• DIN 6914 Replaced
  HV hex bolts for steel structures (old)
• DIN 7 Replaced
  Parallel pins (old)
• DIN 7337 Replaced
  Break mandrel blind rivets (old)
• DIN 7991 Replaced
  Hexagon socket countersunk head screws
• DIN 9021 Replaced
  Washers, outside diameter about 3 x thread
• DIN 912 Replaced
  Hexagon socket head cap screws (ISO 4762 modified)
• DIN 913 Replaced
  Hexagon socket set screws, flat point (ISO 4026 modified)
• DIN 916 Replaced
  Hexagon socket set screws, cup point (ISO 4029 modified)

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