NBR Nitrile 70 Shore A O-Rings for Soft Seal Low Pressure Connections

NBR Nitrile 70 Shore A O-Rings for Soft Seal Low Pressure Connections

NBR (nitrile / Buna-N) O-rings with a nominal hardness of 70 Shore A are offered for low-pressure static-seal requirements in couplings, pneumatic fittings and instrumentation. Select by inner diameter, cross-section and gland dimensions, then review the operating fluid and temperature. Correct squeeze and mating-surface condition are essential to the assembled seal.

Features

• Nominal 70 Shore A nitrile for application-specific static-seal selection
• Select the cross-section and gland depth for the required squeeze
• NBR compound selected according to the actual fluid and temperature
• Confirm installation method and compatible assembly lubricant
• Send an AS568 dash size or metric dimensions to identify the required ring

Applications
Static sealing in hose couplings, pneumatic fittings, instrumentation and low-pressure hydraulic joints, subject to the specified fluid and gland design. Inspect sealing surfaces and confirm groove dimensions before fitting a replacement.

FAQ

Q: What is a "soft seal" and why 70 Shore A?
A: An elastomeric O-ring seals through controlled deformation in its gland. The 70 Shore A value describes hardness; gland squeeze, ring size and surface finish still need to match the assembly requirements.

Q: What pressure is 70 Shore A NBR suited to?
A: Hardness alone does not establish a pressure rating. Review pressure, temperature, extrusion clearance and the selected compound together with the gland design.

Q: Why not use 90 durometer here?
A: Select hardness using the equipment drawing and sealing conditions. Review extrusion clearance and compression force before substituting a 90 Shore A ring for a 70 Shore A requirement.

Q: What fluids can it handle?
A: Provide the complete fluid composition, additives and operating temperature. Use compatibility information for the selected NBR compound to confirm the requirement.

Q: Where are these typically used?
A: Plumbing and hose couplings, pneumatic fittings, instrumentation, compressor and low-pressure hydraulic connections, and water or air lines where a conformable static seal is needed.