568-430 BUNA 70 SQUARE CUT RINGS

The SH70430 is an AS568-430 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring supplied with an inside diameter of 5.1 in (129.54 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 5.65 in (143.51 mm). This square-cut ring offers greater contact area against the gland wall than an equivalent o-ring.

The material holds up against many alcohols, greases and lubricants, and water. Buna-N (Nitrile) is specified for low compression set under sustained load and an economical choice for high-volume maintenance programs. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where automotive brake fluid or polar solvents are present. The profile itself contributes greater resistance to extrusion than a round section of the same size and simple lathe-cut manufacture at low tooling cost. Note that a square section is less suited to high-speed rotary service, where the larger contact area raises friction and heat.

It sees regular use in construction equipment, fluid power, and agricultural equipment.

Order part number SH70430, sold individually. Nominal inside diameter is listed as 5 1/8 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.