4330-514AD MINNESOTA RUBBER QUAD RING

Part number VQ4330 is an AS568-330 black Viton® (FKM) 75 Shore A Quad-Ring measuring an inside diameter of 2.1 in (53.34 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 2.52 in (64.01 mm). A quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

Viton® (FKM) is specified here for industry benchmark where nitrile reaches its thermal limit and outstanding high-temperature capability. The compound resists aromatic hydrocarbons, aggressive chemicals, and chlorinated solvents. 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 resistance to the spiral twisting that defeats round-section rings and lower compressive load required to achieve a seal.

You will find this material specified across aerospace, high-temperature process equipment, and semiconductor equipment.

Reference part number VQ4330 when ordering; the item is sold individually. Nominal inside diameter is listed as 2 1/8. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.