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DURO 90 O-RING KIT (CAT EQUIVALENT P/N 4C-4782)

DURO 90 O-RING KIT (CAT EQUIVALENT P/N 4C-4782)

  • OEM Equivalent O-Rings
  • Suit STOR, ORFS and code 61/62 flanges
  • 580pc kit 

O-Ring Kit Part Numbers and Quantities

Availability: 44 in stock

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  • Description
  • OEM Equivalent O-Rings
  • Suit STOR, ORFS and code 61/62 flanges
  • 580pc kit 

O-Ring Kit Part Numbers and Quantities

4J-0527 — 10 pcs
4J-7533 — 20 pcs
7J-0204 — 20 pcs
1J-0204 — 20 pcs
1J-9671 — 20 pcs
3J-1907 — 20 pcs
4K-1388 — 20 pcs

4J-0526 — 10 pcs
4J-0522 — 15 pcs
4J-0520 — 15 pcs
4J-5267 — 20 pcs
2M-9780 — 20 pcs
7M-8485 — 20 pcs
2S-4078 — 20 pcs

4J-0525 — 10 pcs
4J-0521 — 15 pcs
4J-0519 — 15 pcs
4J-5140 — 20 pcs
3D-2824 — 20 pcs
6K-6307 — 20 pcs

4J-0524 — 15 pcs
6V-9746 — 20 pcs
5K-9090 — 20 pcs
6V-8400 — 20 pcs
8T-0315 — 20 pcs
6K-6307 — 20 pcs

4J-0523 — 15 pcs
4J-5477 — 20 pcs
6V-8397 — 20 pcs
6V-8398 — 20 pcs
7J-9108 — 20 pcs
3K-0360 — 20 pcs
3O-4600 — 20 pcs

 

Uses of Nitrile Duro 90 D-Rings in Earthmoving Equipment

Nitrile (NBR) Duro 90 D-Rings are engineered for heavy-duty sealing applications where components are exposed to high pressure, hydraulic oils, and mechanical stress. Their hardness rating of 90 durometer makes them ideal for demanding earthmoving and heavy-diesel environments that require exceptional extrusion resistance and long-term durability.

Where Nitrile Duro 90 D-Rings Are Commonly Used

  • High-pressure hydraulic systems including pumps, cylinders, valve blocks, and control circuits.

  • Diesel, engine-oil, and transmission-oil sealing points where strong fluid compatibility is essential.

  • Static and slow-moving dynamic interfaces that experience substantial mechanical load or pressure spikes.

  • Heavy-duty connectors, JIC fittings, and flange interfaces found across mobile plant and earthmoving machinery.

Why Duro 90 Nitrile Is Selected

  • Superior extrusion resistance due to the higher hardness (90A), preventing seal blowout in high-pressure systems.

  • Excellent compatibility with petroleum-based fluids, including hydraulic oil, diesel fuel, engine oil, and gear oil.

  • Good abrasion resistance, making it suitable for equipment operating in harsh, dirty environments.

  • Reliable performance across a broad temperature range, typically from –30 °C to +120 °C depending on compound formulation.

  • High tear strength and compression resistance, supporting long service life under heavy mechanical loads.

Limitations and When Not to Use Nitrile Duro 90

  • Not ideal for high-temperature environments above the recommended range; elevated heat may harden or crack the material.

  • Limited resistance to ozone, UV and outdoor weathering compared with silicone or EPDM.

  • Less suited to aggressive chemicals such as brake fluids, certain additives, or highly aromatic fuels.

Practical Examples in Earthmoving Equipment

  • Hydraulic cylinder end caps, piston interfaces, and rod-side sealing locations subject to high fluid pressure.

  • High-pressure supply and return line connections, particularly where extrusion risk is present.

  • Drivetrain and engine-oil system fittings requiring robust oil-resistant sealing.

  • Pump housings and valve manifolds that experience continuous hydraulic pressure loads.

Material-Selection Guidance

  • Choose Nitrile Duro 90 for high-pressure, oil-immersed environments where mechanical load and extrusion resistance are critical.

  • For high-temperature or outdoor weather-exposed locations, consider other elastomers better suited to heat or UV resistance.

  • Ensure the hardness and material type match the system’s pressure rating, fluid type, and operating conditions.