Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
NBR90 Back-up rings
- Category： Back-up rings
- Temperature: -30 - +100℃
- Material: NBR90
- Color: black
- Hardness: 90 shore A
- Product description：Back-Up rings are routinely produced in a 90 durometer Nitrile - Buna-N. This provides sufficient elasticity to permit stretching over the major diameter of a piston and then snapping back into the gl
1. Description
Back-Up rings are routinely produced in a 90 durometer Nitrile - Buna-N. This provides sufficient elasticity to permit stretching over the major diameter of a piston and then snapping back into the gland groove cut into the piston. 90 durometer has sufficient hardness to resist extrusion of the softer elastomeric O-Ring performing the actual sealing function against the high pressure liquid or gas.
2. Sectional Drawing
3. Back-Up Ring Design Reference
Size | Tolerance in mm | |||||||
From | To | W. | TOL.± | T.(REF.) | TOL.± | A. | TOL.± | R |
-4 | -50 | 1.35 | 0.08 | 1.2 | 0.08 | 1.14 | 0.08 | 2.21 |
-102 | -178 | 2.18 | 0.08 | 1.28 | 0.08 | 1.14 | 0.08 | 3.28 |
-201 | -284 | 3 | 0.1 | 1.23 | 0.08 | 1.02 | 0.08 | 4.42 |
-309 | -395 | 4.65 | 0.13 | 1.88 | 0.1 | 1.52 | 0.1 | 6.65 |
-425 | -475 | 5.99 | 0.15 | 2.97 | 0.13 | 2.44 | 0.13 | 8.74 |
About the sizes, you can check the attachment or contact us.
sales@foreverseals.com
Get In Touch With Us
We are committed to meeting the diverse needs of our global customers through innovation and continuous improvement.