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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 | 5 3/4 in Nominal Inner Diameter | 1/4 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

O-rings as elastic loops that seal static and dynamic applications. They are used to seal the space between cylinders, pistons, pipes and tubes and can be made from various materials.

75 Durometer | Fluorocarbon Material | 9 1/2 in Nominal Inner Diameter | 3/16 in Cross Section | O-Ring

Features

• Pressure range varies according to diametral clearance
• Temperature range of -20 °F to -400 °F

O-ring

O-Ring

O-ring

O-Ring

Solid Teflon backup ring with a flat cross-section.

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

PTFE Material | 1 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
• Deals very well with surface wear

O-ring

O-Ring

Solid Urethane backup ring with a flat cross-section.

95A Durometer | Urethane Material | 9/16 in Nominal Inner Diameter | 3/32 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 | 1 15/16 in Nominal Inner Diameter | 3/32 in Cross Section | Backup Ring

Features

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

Cadmium plated with gold chromate to QQL-614 and are inspected for required radial pressure, breakout friction, and rod light-tightness per spec. Manufactured to the MS28776 specification in accordance with the MIL-S-5049 procurement standard.

AM scrapers are typically used in heavy duty hydraulics like aircraft landing gear and steel mill cylinders.

Seal Options

• Solid scraping body only
• Scraping body with a narrow groove accommodating a serpentine form spring to scraping load
• Scraping body with a wide groove in the outside diameter accommodating two “c” style springs (resembling split washers) to generate scraping load

2 3/8 X 2 9/16 Back-up SOLID PTFE