The H50203 is an AS568-203 black Buna-N (Nitrile) 50 Shore A O-Ring measuring an inside diameter of 0.296 in (7.52 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 0.574 in (14.58 mm). This o-ring compresses into its gland to block fluid or gas migration across a joint.
The compound resists petroleum-based oils, greases and lubricants, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for strong abrasion and tear resistance, low compression set under sustained load. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in automotive brake fluid or ketones.
It sees regular use in automotive, hydraulic and pneumatic systems, and construction equipment.
Order part number H50203, sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description -203 BLACK BUNA 50D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 0.296 inch (7.52 mm)
Actual Outside Diameter 0.574 inch (14.58 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity