JIS B 2401-1 O-rings - part 1: O-rings

Is JIS B 2401-1 still current?

Yes. JIS B 2401-1:2012 is the latest edition MechAtlas found (MechAtlas review: 27 October 2026). Check the publisher for amendments before you specify it.

What it covers

Japanese O-ring sizes; parts 2-4 cover housings, quality, back-up rings.

Parts that use JIS B 2401-1

• O-ring (Japan (JIS), main)
  Round-section rubber ring in a groove that seals static or slow-moving joints in hydraulic, pneumatic and pump parts.
  O-rings; part 2 housings, part 4 back-up rings.

Official source

MechAtlas does not reproduce standards. Check the official edition at the publisher's page for JIS B 2401-1 or the JIS store.

Other seals & o-rings standards

• DIN 3771-1 Replaced
  Fluid systems - O-rings - dimensions
• IS 5129 (Part 1) Replaced
  Rotary shaft lip type seals - nominal dimensions and tolerances
• IS 9975 (Part 1) Replaced
  Specification for O-rings - dimensions
• API 682 Current
  Pump shaft sealing systems
• ARPM OS-4 Current
  Application guide for radial lip type shaft seals
• DIN 3760 Current
  Rotary shaft lip seals, types A/AS
• DIN 3761 Current
  Lip seals, automotive/heavy duty types
• DIN ISO 3601-1 Current
  O-rings - part 1 (ISO 3601-1:2012 + Amd 1:2019)
• EN 12756 Current
  Mechanical seal principal dimensions (ex DIN 24960)
• IS 17891 Current
  Fluid power systems - O-rings (parts 1 to 5)
• IS/ISO 6194-1 Current
  Rotary shaft lip seals - nominal dimensions and tolerances
• ISO 21049 Current
  Pump shaft sealing systems

All Seals & O-rings standards →