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BACKUP RINGS

Backup rings are designed to prevent extrusion in rubber o-ring sealing systems. There are three basic types of PTFE back-up rings in use: single turn (scarf cut), multiturn (spiral cut), and solid (uncut) configurations. Our backup rings are made from either one of two materials, PTFE or rubber. Rubber backup rings are called contoured backup rings. The material of choice for rubber contoured rings is 90 durometer nitrile.

PTFE BACKUP RING STYLES

Standard Reference

Style

Online Data Table

Download Datasheet

MS27595

Solid

MS28774

Single Turn

AS8791/1

Single Turn

AS4716 (Groove)

Single Turn, Piston

AS4716 (Groove)

Single Turn, Rod

AS5860

Single Turn, Piston

AS5860

Single Turn, Rod

BACR12BM

Single Turn, Heavy Duty

BACR12BP

Solid, Heavy Duty

MS28782

Spiral

MS28783

Spiral

MS9058

Single Turn, Boss Connection

MS28773

Single Turn, Tube Fitting

TF74C / TF74S

Single Turn / Solid Extended Series

CONTOURED BACKUP RINGS

Contoured backup rings were developed primarily for service in petroleum based hydraulic fluids, at -4°C to 121°C (-40°F to 250°F). The standard 90 durometer nitrile product, provides the maximum benefits in backup ring service. Compounds for use in other fluids and for temperatures up to 204°C (400°F) are available.

Contoured backup rings will stretch up to 50%, and are quickly and easily installed. Advantages of the contour design are obtained regardless of how the contoured rings are installed – they may be installed with the concave face in either direction, toward or away from the o-ring.

Available in all AS-568 sizes. Contact us contoured backup rings.