568-253 FKM 75 SQUARE CUT RINGS

SV70253 is an AS568-253 black Viton® (FKM) 70 Shore A Square-Cut Ring supplied with an inside diameter of 5.359 in (136.12 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.637 in (143.18 mm). In service, this square-cut ring provides an economical lathe-cut alternative where a moulded o-ring is not required.

It resists chlorinated solvents, petroleum oils and fuels, and aromatic hydrocarbons. Viton® (FKM) is specified for the industry benchmark where nitrile reaches its thermal limit and outstanding high-temperature capability. Rated temperature range runs from -15°F (-26.1°C) to 400°F (204.4°C) in continuous service. Verify compatibility before use with ketones and esters or hot water and steam. The profile itself contributes a flat contact band that spreads sealing load across a wider area and greater resistance to extrusion than a round section of the same size. 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 oil and gas, semiconductor equipment, and high-temperature process equipment.

This item is sold individually under part number SV70253. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.