568-208 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-208 black Buna-N (Nitrile) 70 Shore A with an inside diameter of 0.609 in (15.47 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 0.887 in (22.53 mm), catalogued under part number SH70208. It offers greater contact area against the gland wall than an equivalent o-ring.

The material holds up against propane and butane, many alcohols, and water. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for strong abrasion and tear resistance, reliable performance in both static and dynamic service. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Verify compatibility before use with strong acids or automotive brake fluid. The profile itself contributes a rectangular section that will not roll in the groove and a flat contact band that spreads sealing load across a wider area. Note that a square section is less suited to high-speed rotary service, where the larger contact area raises friction and heat.

You will find this material specified across automotive, agricultural equipment, and hydraulic and pneumatic systems.

This item is sold individually under part number SH70208. Unit weight is approximately 0.8542 g and nominal inside diameter is listed as 5/8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.