Backup Rings: Single Turn, Multiturn, and Solid | Seal & Design

Backup Rings

Backup RingBackup 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
Download Datasheet
MS27595
Solid
MS27595 PDF
MS28774
Single Turn
MS28774 PDF
AS8791/1
Single Turn
AS8791/1 PDF
AS4716 (Groove)
Single Turn, Piston
AS4716 (Groove, Piston) PDF
AS4716 (Groove)
Single Turn, Rod
AS4716 (Groove, Rod) PDF
AS5860
Single Turn, Piston
AS5860 (Piston) PDF
AS5860
Single Turn, Rod
AS5860 (Rod) PDF
BACR12BM
Single Turn, Heavy Duty
BACR12BM PDF
BACR12BP
Solid, Heavy Duty
BACR12BP PDF
MS28782
Spiral
MS28782 PDF
MS28783
Spiral
MS28783 PDF
MS9058
Single Turn, Boss Connection
MS9058 PDF
MS28773
Single Turn, Tube Fitting
MS28773 PDF

Contoured Backup Rings

Contoured Backup RingContoured 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.