The H90343 is an AS568-343 black Buna-N (Nitrile) 90 Shore A O-Ring with an inside diameter of 3.725 in (94.62 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.145 in (105.28 mm). This o-ring compresses into its gland to block fluid or gas migration across a joint.
It resists greases and lubricants, hydraulic fluids, and many alcohols. Buna-N (Nitrile) is widely chosen for an economical choice for high-volume maintenance programs and low compression set under sustained load. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C).
It sees regular use in construction equipment, fluid power, and automotive.
Order part number H90343, sold individually. Unit weight is approximately 0.0092 g and nominal inside diameter is listed as 3 3/4 inch. 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.
Description -343 BLACK BUNA 90D O-RING
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 3.725 inch (94.62 mm)
Actual Outside Diameter 4.145 inch (105.28 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity