These supports help fill in gaps between loose-fitting components and hold O-rings in place to maintain an effective seal. Backup rings are harder than O-rings, providing reinforcement to extend the life of O-rings and preventing extrusion that can displace and erode rings in high-pressure installations. To maximize support, a backup ring should be used on each side of an O-ring.
Oil-Resistant Buna-N: Contoured for High Support
The curved face of these backup rings cradles an O-ring, providing contact along the entire diameter to maximize support.
Black — for -25 ° F to 250 ° F
1⁄16 in Width
1⁄4 in Width
1⁄8 in Width
Chemical-Resistant PTFE: Flat for Standard Support
These flat support rings are suited for standard installations.