Premium OK Type Piston Seals for Heavy-Duty Hydraulic Cylinders
OK Type Piston Seal overview
The OK Type Piston Seal is a high-performance, bi-directional piston seal design ideal for heavy-duty hydraulic applications. Specifically engineered for high-pressure environments, this split-design seal combines a tough POM/PTFE slide ring with a robust NBR elastomer energizer. It offers exceptional extrusion resistance and excellent sealing performance under severe working conditions.
DJF as a leading B2B hydraulic seal manufacturer, we provide standard and customized OK-type seals to global distributors, wholesalers, and OEM machinery manufacturers.
Key parameters
| Parameter | Value |
|---|---|
| Material | Nylon + Rubber / POM / PTFE / NBR (Customizable) |
| Performance | Operating pressure: ≤50 MPa, Operating temperature: -30°C to 110°C |
| Application | Suitable for operating conditions involving heavy loads and high pressure, where there are no strict requirements for pressure maintenance. |
Available sizes
72 size(s) recorded for this OK profile piston seal wholesale. Dimensions in millimetres unless noted otherwise.
| Inner Diameter | Outer Diameter | Height | Groove Width |
|---|---|---|---|
| 16 | 25 | 3.9 | 4.2 |
| 21 | 32 | 3.9 | 4.2 |
| 29 | 40 | 3.9 | 4.2 |
| 30 | 42 | 3.9 | 4.2 |
| 39 | 50 | 3.9 | 4.2 |
| 44 | 55 | 3.9 | 4.2 |
| 49 | 60 | 3.9 | 4.2 |
| 59 | 70 | 3.9 | 4.2 |
| 26.3 | 40 | 5.8 | – |
| 34.5 | 50 | 6 | 6.3 |
| 49 | 60 | 6 | 6.3 |
| 44.7 | 63 | 6.7 | 7 |
| 47.5 | 63 | 6 | 6.3 |
| 42 | 63 | 6 | 6.3 |
| 44 | 65 | 6 | 6.3 |
| 54.5 | 70 | 6 | 6.3 |
| 59.5 | 75 | 6 | 6.3 |
| 64.5 | 80 | 6 | 6.3 |
| 69.5 | 85 | 6 | 6.3 |
| 74.5 | 90 | 6 | 6.3 |
| 84.5 | 100 | 6 | 6.3 |
| 94.5 | 110 | 6 | 6.3 |
| 99.5 | 115 | 6 | 6.3 |
| 109.5 | 125 | 6 | 6.3 |
| 114.5 | 130 | 6 | 6.3 |
| 119.5 | 135 | 6 | 6.3 |
| 41.7 | 60 | 7 | – |
| 51.7 | 70 | 7 | – |
| 44.7 | 63 | 7 | – |
| 49 | 70 | 7.8 | 8.1 |
| 54 | 75 | 7.8 | 8.1 |
| 59 | 80 | 7.8 | 8.1 |
| 64 | 85 | 7.8 | 8.1 |
| 69 | 90 | 7.8 | 8.1 |
| 74 | 95 | 7.8 | 8.1 |
| 79 | 100 | 7.8 | 8.1 |
| 84 | 105 | 7.8 | 8.1 |
| 89 | 110 | 7.8 | 8.1 |
| 94 | 115 | 7.8 | 8.1 |
| 99 | 120 | 7.8 | 8.1 |
| 104 | 125 | 7.8 | 8.1 |
| 109 | 130 | 7.8 | 8.1 |
| 114 | 135 | 7.8 | 8.1 |
| 119 | 140 | 7.8 | 8.1 |
| 124 | 145 | 7.8 | 8.1 |
| 129 | 150 | 7.8 | 8.1 |
| 139 | 160 | 7.8 | 8.1 |
| 144 | 165 | 7.8 | 8.1 |
| 149 | 170 | 7.8 | 8.1 |
| 154 | 175 | 7.8 | 8.1 |
| 159 | 180 | 7.8 | 8.1 |
| 164 | 185 | 7.8 | 8.1 |
| 169 | 190 | 7.8 | 8.1 |
| 179 | 200 | 7.8 | 8.1 |
| 189 | 210 | 7.8 | 8.1 |
| 199 | 220 | 7.8 | 8.1 |
| 209 | 230 | 7.8 | 8.1 |
| 219 | 240 | 7.8 | 8.1 |
| 225 | 240 | 7.8 | 8.1 |
| 229 | 250 | 7.8 | 8.1 |
| 239 | 260 | 7.8 | 8.1 |
| 249 | 270 | 7.8 | 8.1 |
| 255.5 | 280 | 7.8 | 8.1 |
| 121.1 | 142.2 | 7.8 | 8.1 |
| 272 | 300 | 9.1 | 9.5 |
| 292 | 320 | 9.1 | 9.5 |
| 302 | 330 | 9.1 | 9.5 |
| 322 | 350 | 9.1 | 9.5 |
| 342 | 370 | 9.1 | 9.5 |
| 392 | 420 | 9.1 | 9.5 |
| 422 | 450 | 9.1 | 9.5 |
| 452 | 480 | 9.1 | 9.5 |
Key Features & Technical Advantages
- High Pressure Resistance: Operates reliably under working pressures up to 50 MPa.
- Excellent Wear Resistance: The reinforced profile ensures minimal friction and a long service life, even in rough cylinder bores.
- Easy Snap-In Installation: The split-ring design allows for hassle-free installation on one-piece pistons without specialized tools.
- Bi-directional Sealing: Provides stable and efficient double-acting sealing performance.
- Superb Extrusion Resistance: Minimizes the risk of seal blowout under shock loads or pressure peaks.
Target Applications
Our OK Type Piston Seals are widely used across various heavy industries, including:
- Construction Machinery (Excavators, bulldozers, loaders)
- Mining Equipment & Hydraulic roof supports
- Agricultural Machinery
- Industrial Hydraulic Cylinders & Heavy-duty presses
Selection guide
To select the correct part, confirm the cylinder bore and rod diameter, the groove dimensions, the operating pressure and temperature, and the medium used. Check rod, housing, height and groove dimensions before ordering. Where a value is not stated above, confirm against drawing before ordering.
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.
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