Rubber O-ring

TOMBO™ No. 2670

Rubber O-ring

A self-seal type rubber O-ring that is made by putting various rubber elastomers into a mold and machining both ends together into a circular shape.
In addition to a shaft seal (packing), it is also fitted into grooves and used as a gasket. It adapts well even with a small clamping load, and can seal against a vacuum pressure up to a high pressure of 25 MPa.

Product Category

Elastomer ProductsPTFE Covered Elastomer / General Purpose Elastomer


Chemistry & PetrochemistryOil Refining & PetrochemistryChemistryElectronicsSemiconductors & Flat Panel Displays (FPD)Electronic Components


Select the material according to the type of liquid (the material is the same as TOMBO No.1050. )
Gaskets for various equipment

Usage scope and standard dimensions

Usage scope
Usage temperature range: depends on the rubber material
Maximum working pressure: 25 MPa

Standard dimensions
JIS B 2401 AS568B

Material Symbol & Material

Material Symbol Material Working temperature range (°C)
NBR Nitrile rubber (oil resistance) -30 to 120
CR Polychloroprene rubber (weather resistance) -30 to 120
EP Ethylene propylene rubber (weather and steam resistance) -40 to 150
SI Silicone rubber (weather and cold resistance) -50 to 200
PF Perfluoro elastomer (corrosion resistance) 0 to 200
FA Fluoro elastomer (heat resistance) -15 to 200


  • TOMBO is a registered trademark or trademark of NICHIAS Corporation.
  • Name of products with "®" are registered trademarks of NICHIAS Corporation.
  • Name of products with "™" are trademarks of NICHIAS Corporation.
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