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Style 590 Back-up Rings feature exceptional strength and abrasion resistance along with a 53 Shore D hardness rating which makes them suitable for high pressure service where extrusion is a problem. Primarily used as a u-seal back-up, these rings can be used with o-rings. They also retrofit urethane and PTFE back-up rings, with greater performance characteristics. “S” suffix designates a split ring.

53 Shore D Durometer | Hytrel Material | 4 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

Solid Urethane backup ring with a flat cross-section.

95A Durometer | Urethane Material | 4 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

Used primarily as an anti-extrusion device for u-seals, these back-up rings combine high performance with very low friction. “ST” suffix designates a split ring.

PTFE Material | 4 in Nominal Inner Diameter | Backup Ring

Features

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

Split Nylon backup ring with a flat cross-section.

Nylon Material | 4 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

Solid Teflon backup ring with a flat cross-section.

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

PTFE Material | 4 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
• Deals very well with surface wear

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

70 Shore D Durometer | Urethane Material | 4 in Nominal Inner Diameter | Modular Back-Ups

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 | 4 in Nominal Inner Diameter | Modular Back-Ups

Features

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