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

Material Specifications Part 2

Japanese Industrial Standard (JIS) B 2401 O-rings

Material Specifications
Part 2