ASTM A193 / A194 High-temperature bolting (B7, B8) and nuts (2H)

Is ASTM A193 / A194 still current?

Yes. A193/A193M-26; A194/A194M-26 is the latest edition MechAtlas found (MechAtlas review: 23 October 2026). Check the publisher for amendments before you specify it.

What it covers

High-temperature bolting (B7, B8) and nuts (2H)

Equivalent and related standards

“Similar” never means interchangeable without an engineering check.

Parts that use ASTM A193 / A194

• Hex nut (USA (ASME / ASTM), material)
  Six-sided internally threaded nut used with bolts and studs to make a clamped joint.
  Grades: A194 2H, 7 etc.
  A194 nuts for high pressure / high temperature bolting.
• Stud bolt / threaded rod (USA (ASME / ASTM), material)
  Rod threaded at both ends or full length, used with two nuts for flanges, housings and long clamps.
  A193 B7 stud with A194 2H nuts
  Grades: B7, B16, B8 etc.; nuts 2H
  Studs and nuts for pressure / high-temperature bolting.

Official source

MechAtlas does not reproduce standards. Check the official edition at the publisher's page for ASTM A193 / A194 or the ASTM 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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