Backup Rings

Parback® backup ring with a curved cross-section.

Parbaks are contoured on one face to minimize distortion of the o-ring when under pressure. Parbaks should be installed with the contoured face against the o-ring, but reversal does no harm.

90A Durometer | Buna-N Rubber Material | 11 1/2 in Nominal Inner Diameter | 1/8 in Cross Section | Backup Ring

Features

• Excellent extrusion resistance
• Easily stretched for installation
• Lubrication is enhanced by rubber which absorbs system fluid and does not plate out on rubbing surfaces

Split Nylon backup ring with a flat cross-section.

Nylon Material | 1 3/4 in Nominal Inner Diameter | 3/16 in Cross Section | Backup Ring

Features

• High strength and abrasion resistance
• Wide temperature range
• Chemical resistance
• Low friction
• Easy installation

Solid Urethane backup ring with a flat cross-section.

95A Durometer | Urethane Material | 6 in Nominal Inner Diameter | 1/8 in Cross Section | Backup Ring

Features

• High strength and abrasion resistance
• Wide temperature range
• Chemical resistance
• Low friction
• Easy installation

Solid Teflon backup ring with a flat cross-section.

PTFE can withstand high temperatures and is compatible with nearly all fluids.

PTFE Material | 2 5/8 in Nominal Inner Diameter | 1/8 in Cross Section | Backup Ring

Features

• High strength and abrasion resistance
• Wide temperature range
• Chemical resistance
• Low friction
• Easy installation
• Deals very well with surface wear

Hard nylon back-up rings for use with U-seals.

Nylon Material | 95 MM Nominal Inner Diameter | 7.5 MM Cross Section | U-Seal Back-Up Ring

Features

• High strength and abrasion resistance
• Wide temperature range
• Chemical resistance
• Low friction
• Easy installation

Commonly used with metric o-rings, these back-up rings are made of virgin PTFE unless suffix specifies otherwise.

PTFE Material | 50 MM Nominal Inner Diameter | 3 MM Cross Section | Backup Ring

Features

• High strength and abrasion resistance
• Wide temperature range
• Chemical resistance
• Low friction
• Easy installation

Commonly used with metric o-rings, these back-up rings are made of virgin PTFE unless suffix specifies otherwise.

PTFE Material | 90 MM Nominal Inner Diameter | 5 MM Cross Section | Backup Ring

Features

• High strength and abrasion resistance
• Wide temperature range
• Chemical resistance
• Low friction
• Easy installation

Solid Urethane backup ring with a flat cross-section.

95A Durometer | Urethane Material | 1/2 in Nominal Inner Diameter | 1/16 in Cross Section | Backup Ring

Features

• High strength and abrasion resistance
• Wide temperature range
• Chemical resistance
• Low friction
• Easy installation

Solid Urethane backup ring with a flat cross-section.

95A Durometer | Urethane Material | 6 in Nominal Inner Diameter | 1/4 in Cross Section | Backup Ring

Features

• High strength and abrasion resistance
• Wide temperature range
• Chemical resistance
• Low friction
• Easy installation

These back-up rings, made from urethane or nylon, are commonly used as spacers for u-seals.

70 Shore D Durometer | Urethane Material | 1 1/2 in Nominal Inner Diameter | Modular Back-Ups

Features

• High strength and abrasion resistance
• Wide temperature range
• Chemical resistance
• Low friction
• Easy installation