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Cat® 7J-9108 NBR O-Ring Seal (90A) for ORFS and STOR Hydraulic Connections

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  2. Cat® 7J-9108 NBR O-Ring Seal (90A) for ORFS and STOR Hydraulic Connections
Cat® 7J-9108 NBR O-Ring Seal (90A) for ORFS and STOR Hydraulic Connections
Cat® 7J-9108 NBR O-Ring Seal (90A) for ORFS and STOR Hydraulic Connections

Secure your hydraulic system with the Cat® 7J-9108 O-Ring. Made from 90A durometer Nitrile (NBR) with optional PTFE coating, this OD-controlled seal is designed for ORFS and STOR fittings in Cat 320D, 336E, and D8T machines. Prevent leaks and protect your equipment with original-quality sealing. Order now for international B2B export.

Technical Specifications 7J‑9108 ‑ Hydraulic O‑Ring for CAT Global Fleet

7J‑9108 O‑Ring — Precision High‑Pressure Hydraulic Sealing Gasket

The 7J‑9108 O‑Ring is a precision‑manufactured sealing component for Caterpillar high‑pressure hydraulic systems. Specially designed for ORFS and STOR straight‑thread sealing joints, it adopts strict dimensional tolerances to ensure perfect fit in seal grooves. It effectively prevents hydraulic oil leakage and external contamination intrusion, maintaining stable sealing performance under high‑pressure and high‑vibration working conditions.

1. Technical Specifications

Technical ParameterImperial SizeMetric Size
Part Number7J‑91087J‑9108
MaterialNitrile Butadiene Rubber (NBR)Nitrile Butadiene Rubber (NBR)
Hardness90 Shore A90 Shore A
Inner Diameter0.619 in15.72 mm
Cross‑Section Diameter0.070 in1.78 mm
Surface TreatmentOptional PTFE Anti‑Friction CoatingOptional PTFE Anti‑Friction Coating

2. Machine Compatibility

This universal high‑pressure O‑Ring is widely used in almost all series of Caterpillar construction machinery and industrial equipment:

  • Excavators: 320B/C/D/E/GC, 330, 336D/E/F, 345, 349, 312, 307, 308, M318 Wheel Excavators

  • Engine Series: C7, C9, C13, C15, C18, C27, C32, 3500‑Series, 3600‑Series Diesel Engines

  • Dozers: D6T, D7E, D8T, D9T, D10T, D11T Heavy‑Duty Track‑Type Tractors

  • Wheel Loaders: 950, 966, 972, 980, 988, 992, 994H Large Loaders

  • Off‑Highway Mining Trucks: 770, 772, 773, 775, 777, 789, 793, 797 Series

  • Road‑Building & Support Machines: 140M/160M Motor Graders, RM500B Stabilizer Reclaimers, 420/430 Backhoe Loaders

3. Key Features & Advantages

  • High‑Hardness Wear‑Resistant Formula: 90‑Shore‑A high‑density NBR material resists extrusion, abrasion and permanent compression deformation under long‑term high‑pressure impact.

  • Optional PTFE Low‑Friction Coating: Reduces assembly friction, avoids seal twisting and cutting during installation, improving assembly efficiency and service life.

  • Wide Medium Compatibility: Adaptable to hydraulic oil, engine oil and other common media of CAT equipment, with stable performance in variable‑temperature working environments.

  • Precision‑Controlled Dimensional Stability: Strict tolerance manufacturing ensures consistent compression ratio, preventing internal hydraulic oil leakage and external dust‑water intrusion.

Commercial Reference Information
Product: Hydraulic System O‑Ring Seal
Cross Part Number: 7J9108
MOQ: 10‑100 PCS
Warranty Period: 6‑12 Months

For bulk wholesale, technical consultation and sealing‑system component solutions:

Xuzhou Sinoswift Import & Export Co., Ltd.
Contact: +86 13701956981
Email: [email protected]

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