The H90349 is an AS568-349 black Buna-N (Nitrile) 90 Shore A O-Ring with an inside diameter of 4.475 in (113.67 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.895 in (124.33 mm). This o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.
Buna-N (Nitrile) is specified here for reliable performance in both static and dynamic service, strong abrasion and tear resistance. The compound resists propane and butane, many alcohols, and hydraulic fluids. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where strong acids or ketones are present.
It sees regular use in automotive, agricultural equipment, and fluid power.
H90349 ships individually. Unit weight is approximately 11.621 g and nominal inside diameter is listed as 4 1/2 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.
Description -349 BLACK BUNA 90D O-RING
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 4.475 inch (113.67 mm)
Actual Outside Diameter 4.895 inch (124.33 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity