Backup Rings
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Parbak® style backup ring with a curved cross-section.
This style of backup ring is contoured on one face to minimize distortion of the o-ring when under pressure. Parbak® style backup rings should be installed with the contoured face against the o-ring, but reversal does no harm.
90A Durometer | Buna-N Rubber Material | 4 1/8 in Nominal Inner Diameter | 1/8 in Cross Section | Backup Ring
Parbak® style backup ring with a curved cross-section.
This style of backup ring is contoured on one face to minimize distortion of the o-ring when under pressure. Parbak® style backup rings should be installed with the contoured face against the o-ring, but reversal does no harm.
90A Durometer | Buna-N Rubber Material | 3 5/8 in Nominal Inner Diameter | 3/16 in Cross Section | Backup Ring
Parbak® style backup ring with a curved cross-section.
This style of backup ring is contoured on one face to minimize distortion of the o-ring when under pressure. Parbak® style backup rings should be installed with the contoured face against the o-ring, but reversal does no harm.
90A Durometer | Buna-N Rubber Material | 1 3/4 in Nominal Inner Diameter | 1/8 in Cross Section | Backup Ring
Solid Urethane backup ring with a flat cross-section.
95A Durometer | Urethane Material | 2 3/4 in Nominal Inner Diameter | 1/8 in Cross Section | Backup Ring
Parbak® style backup ring with a curved cross-section.
This style of backup ring is contoured on one face to minimize distortion of the o-ring when under pressure. Parbak® style backup rings should be installed with the contoured face against the o-ring, but reversal does no harm.
90A Durometer | Buna-N Rubber Material | 3 3/4 in Nominal Inner Diameter | 1/8 in Cross Section | Backup Ring
Solid Urethane backup ring with a flat cross-section.
95A Durometer | Urethane Material | 1 3/4 in Nominal Inner Diameter | 1/8 in Cross Section | Backup Ring
Solid Urethane backup ring with a flat cross-section.
95A Durometer | Urethane Material | 3 1/4 in Nominal Inner Diameter | 1/8 in Cross Section | Backup Ring
Parbak® style backup ring with a curved cross-section.
This style of backup ring is contoured on one face to minimize distortion of the o-ring when under pressure. Parbak® style backup rings should be installed with the contoured face against the o-ring, but reversal does no harm.
90A Durometer | Buna-N Rubber Material | 3 in Nominal Inner Diameter | 1/8 in Cross Section | Backup Ring
Solid Urethane backup ring with a flat cross-section.
95A Durometer | Urethane Material | 3 3/4 in Nominal Inner Diameter | 1/8 in Cross Section | Backup Ring
Parbak® style backup ring with a curved cross-section.
This style of backup ring is contoured on one face to minimize distortion of the o-ring when under pressure. Parbak® style backup rings should be installed with the contoured face against the o-ring, but reversal does no harm.
90A Durometer | Buna-N Rubber Material | 3 1/8 in Nominal Inner Diameter | 3/16 in Cross Section | Backup Ring
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Back-up rings are installed together with o-rings or other accompanying seals to prevent gap extrusion in sealing applications. They are available in a spiral, split, or solid design.
