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Material Specifications
Part 2

Japanese Industrial Standard (JIS) B 2401 O-rings

Another general material specification standard is the Japanese Industrial Standard (JIS) B 2401 “O-rings.” The classification system recommended by this standard is twofold, by material and by size and use. The material classification is as follows:

Class
Remarks
Duro
Tensile
Strength
Elongation
Compression Set
Marking
1 A Non-mineral oil use 70 > 8.0 200% 40% (70hr@120°C) 1 Blue Dot
1 B Non-mineral oil use 90 > 12.0 80% 40% (70hr@120°C) 2 Blue Dots
2 Non-gasoline use 70 > 8.0 160% 25% (70hr@100°C) 1 Red Dot
3 Non-animal or -vegetable oil use 70 > 8.0 120% 25% (70hr@100°C) 1 Yellow Dot
4 C Heat resistant 70 > 3.5 50% 30% (22hr@175°C) None
4 D Heat resistant 70 > 8.0 160% 40% (22hr@175°C) 1 Green Dot

Next Topic Material Specifications Part 3, Other Specifications

 

 

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