Caterpillar 2M-9780 O-Ring Seal – 90A Nitrile STOR, 7/8-14

The Caterpillar 2M-9780 O-Ring Seal is a high-quality 90A nitrile (NBR) sealing ring designed for use in hydraulic, pump, brake, and fluid line applications. This O-ring is a Straight Thread O-Ring (STOR) style seal for SAE 7/8-14 fittings.

Built to provide reliable sealing performance, the 2M-9780 helps prevent fluid leaks and contamination in demanding heavy-duty equipment applications. It is suitable for use with petroleum-based lubricants, hydrocarbon fuels, ethylene glycol, water-based engine coolants, and other compatible fluids.

Product Features

• Part Number: 2M-9780
• Brand: Caterpillar / Cat
• Product Type: O-Ring Seal
• Material: Nitrile (NBR)
• Hardness: 90A
• O-Ring Type: Straight Thread O-Ring (STOR)
• Fitting Size: SAE 7/8-14
• Inside Diameter: 0.755 in.
• Cross Section Diameter: 0.097 in.
• Dash Size: 910
• Designed for heavy-duty hydraulic, pump, brake, and fluid line sealing applications
• Helps reduce leaks and protect components from contamination

The official Caterpillar specifications identify the 2M-9780 as a 2.46 × 19.18 mm, 90A NBR O-ring used in STOR sealing applications.