Curved Backup Ring - NBR
SKU:
574-346
574-346 90A Buna-N Rubber Backup Ring | 4 1/8 in ID 3/16 in CS
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.
$2.90 / EA
90A Durometer | Buna-N Rubber Material | 4 1/8 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
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Item Specifications
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3/16 Inch
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90A
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Parker
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NBR
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Buna-N Rubber
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240 °F
-
-40 °F
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0.076 Inch
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4 1/8 Inch
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4 1/2 Inch
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Varies According to Diametral Clearance
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15 Years
-
574
-
-40° to +240°F
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0.06 Inch
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±0.004
-
inch
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0.01 lbs per EA
