Greene, Tweed & Co. Datasheets for Back-up Rings

Back-up rings or anti-extrusion rings are washer-like devices used to prevent seals from extruding through gaps while under pressure. Seals are installed in the downstream side of the gland.
Back-up Rings: Learn more

Product Name Notes
4270 Series Back-Up Rings Greene, Tweed’s 4270 series has been specifically designed for use in MIL-G-5514 gland configurations as anti-extrusion devices in conjunction with O-rings, packings or other elastomeric seal types. A variety of...
4330 Series Back-Up Rings
4340 Series Back-Up Rings
Greene, Tweed’s new 43 back-up ring series has been specifically designed for use in AS5857 gland configurations as anti-extrusion devices in conjunction with O-rings, packings or other elastomeric seal types.
4230 Series Back-Up Rings
4240 Series Back-Up Rings
This series provides a part numbering system for back-up rings as per the Aerospace specifications AS5781 and AS5782. These specifications are based on virgin but pigmented PTFE materials. AS5781 is...