O-ring 348 — NBR (Nitrile) 90A
Standard: AS568A
Size (AS568A number): 348
Cross-sectional diameter (CS): 5.33 ± 0.13 mm
Inside diameter (ID): 110.49 ± 0.76 mm
Material: NBR (Nitrile Rubber)
Hardness: 90 Shore A
Key properties and typical uses:
Excellent resistance to oils, fuels, and hydraulic fluids.
Good sealing performance under compression; suitable for static and low-dynamic sealing applications.
Not recommended for prolonged exposure to ozone, weathering, or high-temperature environments above the material’s limits.
Commonly used in hydraulic systems, fuel systems, pneumatic components (low-speed), and general industrial equipment where oil resistance and good mechanical properties are required.
Quality and tolerance notes:
Dimensions conform to AS568A standard tolerances; verify critical fit in mating grooves and gland design per application.
Hardness at 90A provides higher compression set resistance but reduced flexibility compared with lower durometer grades; ensure compatibility with required sealing load and surface finish.
Ordering/inspection checklist:
Confirm AS568A size 348 and specified dimensional tolerances.
Specify NBR 90A material and any required certifications (e.g., lot traceability, compound certificates).
Request post-cure, storage, and shelf-life recommendations if long-term inventory is planned.
Consider alternate elastomers (e.g., FKM, EPDM, Silicone) if chemical, temperature, or ozone resistance requirements exceed NBR capabilities.
O-ring 348 — NBR (Nitrile) 90A
Standard: AS568A
Size (AS568A number): 348
Cross-sectional diameter (CS): 5.33 ± 0.13 mm
Inside diameter (ID): 110.49 ± 0.76 mm
Material: NBR (Nitrile Rubber)
Hardness: 90 Shore A
Key properties and typical uses:
Excellent resistance to oils, fuels, and hydraulic fluids.
Good sealing performance under compression; suitable for static and low-dynamic sealing applications.
Not recommended for prolonged exposure to ozone, weathering, or high-temperature environments above the material’s limits.
Commonly used in hydraulic systems, fuel systems, pneumatic components (low-speed), and general industrial equipment where oil resistance and good mechanical properties are required.
Quality and tolerance notes:
Dimensions conform to AS568A standard tolerances; verify critical fit in mating grooves and gland design per application.
Hardness at 90A provides higher compression set resistance but reduced flexibility compared with lower durometer grades; ensure compatibility with required sealing load and surface finish.
Ordering/inspection checklist:
Confirm AS568A size 348 and specified dimensional tolerances.
Specify NBR 90A material and any required certifications (e.g., lot traceability, compound certificates).
Request post-cure, storage, and shelf-life recommendations if long-term inventory is planned.
Consider alternate elastomers (e.g., FKM, EPDM, Silicone) if chemical, temperature, or ozone resistance requirements exceed NBR capabilities.