• OEM Equivalent O-Rings
• Suit STOR, ORFS and code 61/62 flanges
• 570pc kit

✅ STOR – Straight Thread O-Ring

• 4J-7533 — Qty 20 — Dash 2

• 7J-0204 — Qty 20 — Dash 3

• 3J-7354 — Qty 20 — Dash 4

• 1J-9671 — Qty 20 — Dash 5

• 3J-1907 — Qty 20 — Dash 6

• 3K-0340 — Qty 20 — Dash 8

• 2M-9780 — Qty 20 — Dash 10

• 3D-2824 — Qty 20 — Dash 12

• 4K-1388 — Qty 20 — Dash 14

• 7M-8485 — Qty 20 — Dash 16

• 2S-4078 — Qty 20 — Dash 20

• 6K-6307 — Qty 20 — Dash 24

• 030-4606 — Qty 10 — Dash 32

✅ ORFS – O-Ring Face Seal

• 4J-5477 — Qty 20 — Dash 3, 4 & 5

• 6V-8397 — Qty 20 — Dash 6

• 6V-8398 — Qty 20 — Dash 8

• 7J-9108 — Qty 20 — Dash 10

• 6V-9746 — Qty 20 — Dash 12 & 14

• 6V-8400 — Qty 20 — Dash 16

• 8T-0315 — Qty 20 — Dash 24

✅ Flange – O-Ring 61/62 Flange Seal

• 4J-5140 — Qty 20 — Dash 8

• 4J-5267 — Qty 20 — Dash 12

• 4J-0519 — Qty 20— Dash 12

• 4J-0520 — Qty 15 — Dash 16

• 4J-0521 — Qty 15 — Dash 20

• 4J-0522 — Qty 15— Dash 20

• 4J-0523 — Qty 15 — Dash 20

• 4J-0524 — Qty 10 — Dash 24

• 4J-0525 — Qty 10 — Dash 24

• 4J-0526 — Qty 10 — Dash 24

• 4J-0527 — Qty 10 — Dash 32

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.