PTFE Back-up Ring
Product overview
Premium Back-up Rings Manufacturer & Supplier. We offer a wide range of high-performance custom back-up rings (TPU, FKM, PTFE, PEEK etc) for high-pressure sealing environments. Contact our engineering team for free samples, OEM/ODM services, and factory-direct pricing!
Key parameters
| Parameter | Value |
|---|---|
| Material | Polyurethane TPU / PTFE Polytetrafluoroethylene |
| Performance | Red Gasket: Hardness of Shore 60D, maximum operating temperature of 80°C; offers superior extrusion resistance compared to traditional PTFE backup rings. White Gasket: Features excellent chemical stability, heat and cold resistance, and resistance to corrosion and aging; compatible with various media including oil, water, steam, and chemicals. It offers high mechanical strength, pressure resistance (<40 MPa), wear resistance, and an extremely low coefficient of friction. It possesses good self-lubricating properties and is suitable for long-term use within a temperature range of -200°C to +250°C. |
| Application | Back-up rings and flange seals; widely used in general hydraulic cylinders for sectors such as aerospace, metallurgy, petrochemicals, and construction machinery, as well as in light industrial machinery. They are typically used in conjunction with O-rings, primarily serving to enhance the O-ring’s compressive strength and prevent extrusion. |
Available sizes
256 size(s) recorded for this profile. Dimensions in millimetres unless noted otherwise.
| Inner Diameter (d) | Outer Diameter (D) | Height (T) |
|---|---|---|
| 3 | 6 | 1.25 |
| 4 | 7 | 1.25 |
| 5 | 8 | 1.25 |
| 6 | 9 | 1.25 |
| 7 | 10 | 1.25 |
| 8 | 11 | 1.25 |
| 9 | 12 | 1.25 |
| 10 | 13 | 1.25 |
| 10 | 14 | 1.25 |
| 11 | 15 | 1.25 |
| 12 | 16 | 1.25 |
| 13 | 17 | 1.25 |
| 14 | 18 | 1.25 |
| 14 | 19 | 1.25 |
| 15 | 19 | 1.25 |
| 15.5 | 18 | 1.25 |
| 16 | 20 | 1.25 |
| 17 | 21 | 1.25 |
| 18 | 22 | 1.25 |
| 19 | 23 | 1.25 |
| 20 | 24 | 1.25 |
| 21 | 25 | 1.25 |
| 22 | 26 | 1.25 |
| 22 | 28 | 1.25 |
| 23 | 29 | 1.25 |
| 24 | 30 | 1.25 |
| 25 | 30 | 1.25 |
| 25 | 31 | 1.25 |
| 26 | 32 | 1.25 |
| 27 | 33 | 1.25 |
| 28 | 32 | 1.25 |
| 28 | 34 | 1.25 |
| 29 | 35 | 1.25 |
| 30 | 35 | 1.25 |
| 30 | 36 | 1.25 |
| 31 | 37 | 1.25 |
| 32 | 38 | 1.25 |
| 33 | 39 | 1.25 |
| 34 | 40 | 1.25 |
| 35 | 40 | 1.25 |
| 35 | 41 | 1.25 |
| 36 | 42 | 1.25 |
| 37 | 43 | 1.25 |
| 38 | 44 | 1.25 |
| 39 | 45 | 1.25 |
| 40 | 45 | 1.25 |
| 40 | 46 | 1.25 |
| 41 | 47 | 1.25 |
| 42 | 48 | 1.25 |
| 43 | 49 | 1.25 |
| 44 | 50 | 1.25 |
| 45 | 50 | 1.25 |
| 45 | 51 | 1.25 |
| 50 | 55 | 1.25 |
| 55 | 60 | 1.25 |
| 60 | 65 | 1.25 |
| 63 | 68 | 1.25 |
| 65 | 70 | 1.25 |
| 70 | 75 | 1.25 |
| 75 | 80 | 1.25 |
| 80 | 85 | 1.25 |
| 85 | 90 | 1.25 |
| 90 | 95 | 1.25 |
| 95 | 100 | 1.25 |
| 100 | 105 | 1.25 |
| 105 | 110 | 1.25 |
| 110 | 115 | 1.25 |
| 115 | 120 | 1.25 |
| 120 | 125 | 1.25 |
| 125 | 130 | 1.25 |
| 130 | 135 | 1.25 |
| 135 | 140 | 1.25 |
| 140 | 145 | 1.25 |
| 145 | 150 | 1.25 |
| 50 | 56 | 1.3 |
| 18.5 | 20.5 | 1.5 |
| 40 | 50 | 1.9 |
| 45 | 55 | 1.9 |
| 50 | 60 | 1.9 |
| 55 | 65 | 1.9 |
| 60 | 70 | 1.9 |
| 65 | 75 | 1.9 |
| 70 | 80 | 1.9 |
| 75 | 85 | 1.9 |
| 80 | 90 | 1.9 |
| 85 | 95 | 1.9 |
| 90 | 100 | 1.9 |
| 95 | 105 | 1.9 |
| 100 | 110 | 1.9 |
| 105 | 115 | 1.9 |
| 110 | 120 | 1.9 |
| 115 | 125 | 1.9 |
| 120 | 130 | 1.9 |
| 125 | 135 | 1.9 |
| 130 | 140 | 1.9 |
| 135 | 145 | 1.9 |
| 140 | 150 | 1.9 |
| 145 | 155 | 1.9 |
| 150 | 160 | 1.9 |
| 155 | 165 | 1.9 |
| 160 | 170 | 1.9 |
| 165 | 175 | 1.9 |
| 170 | 180 | 1.9 |
| 175 | 185 | 1.9 |
| 180 | 190 | 1.9 |
| 185 | 195 | 1.9 |
| 190 | 200 | 1.9 |
| 195 | 205 | 1.9 |
| 200 | 210 | 1.9 |
| 210 | 220 | 1.9 |
| 215 | 225 | 1.9 |
| 220 | 230 | 1.9 |
| 225 | 235 | 1.9 |
| 230 | 240 | 1.9 |
| 240 | 250 | 1.9 |
| 250 | 260 | 1.9 |
| 150 | 165 | 2.75 |
| 155 | 170 | 2.75 |
| 160 | 175 | 2.75 |
| 165 | 180 | 2.75 |
| 170 | 185 | 2.75 |
| 175 | 190 | 2.75 |
| 180 | 195 | 2.75 |
| 185 | 200 | 2.75 |
| 190 | 205 | 2.75 |
| 195 | 210 | 2.75 |
| 200 | 215 | 2.75 |
| 210 | 225 | 2.75 |
| 30 | 40 | 3 |
| 30 | 43 | 3 |
| 30 | 45 | 3 |
| 32 | 48 | 3 |
| 35 | 45 | 3 |
| 35 | 50 | 3 |
| 38 | 58 | 3 |
| 40 | 50 | 3 |
| 40 | 55 | 3 |
| 40 | 60 | 3 |
| 45 | 55 | 3 |
| 45 | 80 | 4 |
| 45 | 60 | 3 |
| 45 | 65 | 3 |
| 50 | 60 | 3 |
| 50 | 63 | 3 |
| 50 | 65 | 3 |
| 50 | 70 | 3 |
| 55 | 65 | 3 |
| 55 | 68 | 3 |
| 55 | 70 | 3 |
| 60 | 70 | 3 |
| 60 | 73 | 3 |
| 60 | 75 | 3 |
| 60 | 80 | 3 |
| 60 | 85 | 3 |
| 65 | 75 | 3 |
| 65 | 78 | 3 |
| 65 | 80 | 3 |
| 65 | 85 | 3 |
| 65 | 90 | 3 |
| 70 | 73 | 3 |
| 70 | 80 | 3 |
| 70 | 85 | 3 |
| 70 | 90 | 3 |
| 75 | 85 | 3 |
| 75 | 88 | 3 |
| 75 | 90 | 3 |
| 75 | 95 | 3 |
| 80 | 90 | 3 |
| 80 | 93 | 3 |
| 80 | 95 | 3 |
| 80 | 100 | 3 |
| 80 | 105 | 3 |
| 85 | 95 | 3 |
| 85 | 100 | 3 |
| 85 | 105 | 3 |
| 90 | 100 | 3 |
| 90 | 105 | 3 |
| 90 | 110 | 3 |
| 95 | 105 | 3 |
| 95 | 110 | 3 |
| 95 | 115 | 3 |
| 100 | 115 | 3 |
| 100 | 120 | 3 |
| 105 | 120 | 3 |
| 105 | 125 | 3 |
| 115 | 130 | 3 |
| 115 | 135 | 3 |
| 120 | 135 | 3 |
| 120 | 140 | 3 |
| 125 | 140 | 3 |
| 125 | 145 | 3 |
| 130 | 145 | 3 |
| 130 | 150 | 3 |
| 135 | 150 | 3 |
| 140 | 155 | 3 |
| 140 | 160 | 3 |
| 145 | 160 | 3 |
| 150 | 165 | 3 |
| 150 | 170 | 3 |
| 160 | 175 | 3 |
| 165 | 180 | 3 |
| 170 | 185 | 3 |
| 175 | 190 | 3 |
| 180 | 195 | 3 |
| 185 | 200 | 3 |
| 190 | 205 | 3 |
| 195 | 210 | 3 |
| 200 | 215 | 3 |
| 200 | 225 | 3 |
| 205 | 220 | 3 |
| 210 | 225 | 3 |
| 215 | 230 | 3 |
| 215 | 240 | 3 |
| 220 | 235 | 3 |
| 225 | 240 | 3 |
| 230 | 245 | 3 |
| 235 | 250 | 3 |
| 250 | 265 | 3 |
| 255 | 270 | 3 |
| 260 | 275 | 3 |
| 265 | 280 | 3 |
| 270 | 285 | 3 |
| 275 | 290 | 3 |
| 280 | 295 | 3 |
| 285 | 300 | 3 |
| 290 | 305 | 3 |
| 295 | 310 | 3 |
| 300 | 315 | 3 |
| 310 | 325 | 3 |
| 320 | 340 | 3 |
| 325 | 340 | 3 |
| 340 | 360 | 3 |
| 350 | 370 | 3 |
| 40 | 42.5 | 2.65 |
| 52.5 | 55 | 2.65 |
| 56 | 58.2 | 2.65 |
| 50 | 52.4 | 2.4 |
| 55 | 57.4 | 2.4 |
| 60 | 62.4 | 2.4 |
| 65 | 67.4 | 2.4 |
| 70 | 72.4 | 2.4 |
| 73 | 76.6 | 2.8 |
| 85 | 87.4 | 2.4 |
| 100 | 104.4 | 2.4 |
| 44.6 | 48.6 | 2.4 |
| 85.8 | 89.8 | 2.4 |
| 62 | 66 | 4.5 |
| 39.7 | 42.7 | 2.8 |
| 42 | 45 | 2.6 |
| 70 | 74 | 4.5 |
| 105 | 109 | 4.5 |
| 65 | 70 | 4.5 |
| 81 | 84.6 | 4.5 |
| 68 | 74 | 4.5 |
| 36 | 39.2 | 2.64 |
| 26 | 29 | 2.65 |
Applications
- Hydraulic cylinders on excavators, loaders, cranes and other mobile machinery
- Industrial cylinders, presses and hydraulic power units
- Replacement seal programmes for maintenance and repair workshops
Request a quote
Send your part number, size list or drawing with quantity to DJF Seal for a quotation. We supply B2B, wholesale and OEM volumes with export packing.
FAQ
What is the Back-up Ring (Red / White)used for?
It is used in back-up rings applications. Confirm the exact groove and mating dimensions against your drawing before ordering.
Can DJF supply custom sizes?
Yes. DJF Seal is a hydraulic seal manufacturer (not a distributor) and can quote custom and non-standard sizes against your drawing or sample.
What is the minimum order quantity?
MOQ depends on profile and size. Send your part list and quantity; we reply with price, lead time and packing details.
Do you supply wholesale / OEM volumes?
Yes. DJF supports wholesalers, repair workshops and OEM programmes with bulk pricing, neutral or private-label packaging.
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