The VBU90254 is an AS568-254 black Viton® (FKM) 90 Shore A Back-Up Ring with an inside diameter of 5.484 in (139.29 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.762 in (146.35 mm). This back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.
The compound resists chlorinated solvents, aromatic hydrocarbons, and many acids. Viton® (FKM) is valued for long service life in hot, chemically aggressive environments and very low compression set at elevated temperature. Published continuous service range is -15°F (-26.1°C) to 400°F (204.4°C).
Typical settings include automotive fuel systems, aerospace, and oil and gas.
Order part number VBU90254, sold individually. 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 8-254 BLACK FKM 90D BACK-UP RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 5.484 inch (139.29 mm)
Actual Outside Diameter 5.762 inch (146.35 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings