Backup Rings
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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 | 7 3/4 in Nominal Inner Diameter | 3/16 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
Solid Teflon backup ring with a flat cross-section.
PTFE can withstand high temperatures and is compatible with nearly all fluids.
PTFE Material | 7/16 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
- Deals very well with surface wear
Solid Teflon backup ring with a flat cross-section.
PTFE can withstand high temperatures and is compatible with nearly all fluids.
PTFE Material | 3 1/8 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
- Deals very well with surface wear
Solid Teflon backup ring with a flat cross-section.
PTFE can withstand high temperatures and is compatible with nearly all fluids.
- High temperature range
- Deals very well with surface wear
Solid Urethane backup ring with a flat cross-section.
95A Durometer | Urethane Material | 8 1/2 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 Teflon backup ring with a flat cross-section.
PTFE can withstand high temperatures and is compatible with nearly all fluids.
PTFE Material | 7 1/2 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
Split Nylon backup ring with a flat cross-section.
Nylon Material | 3 3/4 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 | 3 1/2 in Nominal Inner Diameter | 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
