Standards for O-Rings

UNI ISO 3601-1
Fluid systems; sealing devices; O-rings; part 1: inside diameters, cross-sections, tolerances and size identification code.

UNI ISO 3601-3
Fluid systems; Sealing devices; O-rings; Part 3 : Quality acceptance criteria.

UNI EN 681-1
Elastomeric seals - Material requirements for pipe joint seals used in water and drainage applications - Part 1: Vulcanized rubber.

UNI EN 681-2
Elastomeric seals - Material requirements for pipe joints seals used in water and drainage applications - Part 2: Thermoplastic elastomers.

UNI EN 681-3
Elastomeric seals - Material requirements for pipe joints seals used in water and drainage applications - Part 3: Cellular materials of vulcanized rubber.

UNI EN 681-4
Elastomeric seals - Material requirements for pipe joints seals used in water and drainage applications - Part 4: Cast polyurethane sealing elements.

UNI EN 549
Rubber materials for seals and diaphragms for gas appliances and gas equipment.

BS 1806 (UK)
Specification for dimensions of toroidal sealing rings ('O'-rings) and their housings.

BS 4518 (UK)
Specification for metric dimensions of toroidal sealing rings ('O'-rings) and their housings.

NF-T 47-501 (FR)
Fluid systems; O-rings; dimensions as in ISO 3601/1.

NF-T 47-503 (FR)
Fluid systems; O-rings; dimensions as in ISO 3601/1.

UNI EN 3049
Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set - Hardness 80 IRHD.

UNI EN 3050
Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set - Technical specification.