APG stocks the SH70102, an AS568-102 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring built to an inside diameter of 0.049 in (1.24 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 0.255 in (6.48 mm). A square-cut ring seals with a broad flat contact band instead of the line contact of a round-section ring.
The compound resists hydraulic fluids, water, and many alcohols. Buna-N (Nitrile) offers an economical choice for high-volume maintenance programs and the most widely specified general-purpose sealing elastomer. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It should not be specified for service in ketones or strong acids. 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, construction equipment, and general industrial maintenance.
This item is sold individually under part number SH70102. Nominal inside diameter is listed as 1/16 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description 568-102 BUNA 70 SQUARE CUT RINGS
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 0.049 inch (1.24 mm)
Actual Outside Diameter 0.255 inch (6.48 mm)
Measurement System Imperial
Product Category O-Rings - Square/Quad - Commodity