Black NBR O Ring Seal with 70 Shore A Hardness for Oilfield Use

Black NBR 70 Shore A O-Ring Seals for Oilfield Equipment

This listing covers black nitrile O-rings identified by a nominal hardness of 70 Shore A. Select the ring by its inside diameter and cross-section, or the complete AS568 dash number, together with the equipment groove dimensions. The AS568 reference identifies a size system; it does not assign a pressure rating.

Dimensions and installation

Specify ID × cross-section in millimetres and include the tolerance requirement. Confirm the gland width, depth, clearance and whether the seal is static or moving. Do not identify a replacement solely from a worn or swollen ring; use the equipment drawing or an unworn sample where available.

Oilfield service selection

Provide the actual oil or hydraulic fluid, additives, continuous and peak temperatures, pressure cycle and movement conditions. NBR material identity and hardness alone do not establish sour-gas suitability or a universal pressure limit. Confirm the compound for the requested service before ordering.

Ordering information

Send the size or AS568 dash number, equipment reference, quantity and inspection requirements. Standard and custom dimensions are confirmed with the quotation. Keep the approved part identification with spare stock to avoid mixing similar sizes.