Product Description
The Nitrile Butadiene (NBR) compound has excellent resistance to a wide variety of fluids, good tensile strength, high elongation, low compression set, and excellent resistance to abrasion and tearBack-up rings are washer-like devices that are used to prevent a seal from extruding through any gaps while under pressure. These seals are installed in the downstream side of the gland. Back-up rings are not seals themselves, but are usually used in conjunction with O-rings in high-pressure applications (over 1500 psi) for support or as spacersMolded from 90A durometer Buna nitrile rubber, the 574 series dished cross section back up rings provide excellent extrusion resistance. Stretched for installation, they return quickly to their original shapeDash number sizes listed after the 574- prefix, correspond to its o-ring companion (i.e. 574-211 = 211 oring)
Reference Dimensions:
574-004 thru 574-050 (T = .049" & A = .045+/-.003")
574-102 thru 574-178 (T = .053" & A = .045+/-.003")
574-201 thru 574-284 (T = .050" & A = .040+/-.003")
574-309 thru 574-395 (T = .076 & A = .060+/-.004")
574-425 thru 574-475 (T = .117" & A= .096+/-.005")
DMR O-Rings & Related Sealing Materials
Custom Field
Temperature range -65 º F to 250 º F
Usual colour Black
Hardness range 70 ~ 90 Shore A
