Value Collection ZMSCH3X20 O-ring 20in Id 26in Od Buna-n

Product Description

The VALUE COLLECTION ZMSCH3X20 is a round-cross-section O-ring manufactured from Buna-N (Nitrile Butadiene Rubber), the most widely used elastomer in sealing applications. It measures 20 inches inside diameter, 26 inches outside diameter, and 3 inches thick. Rated for service from -40 degrees F to 250 degrees F, this O-ring delivers excellent compression set resistance along with strong tear and abrasion resistance. It is compatible with petroleum-based fluids and media, making it a standard choice for hydraulic, pneumatic, and fluid-handling systems across industrial and commercial trades. Hardness is rated at 70 Shore A (Hard).

This O-ring is suited for static and dynamic sealing applications in hydraulic cylinders, pump housings, pipe flanges, valves, and fluid-transfer equipment where petroleum-product exposure is expected. Its large diameter makes it appropriate for industrial-scale equipment rather than residential plumbing fittings. Plumbers, pipefitters, millwrights, and industrial maintenance technicians are the primary installers. The part meets SAE and MIL-Spec standards, confirming its suitability for demanding service environments. It is sold in a package quantity of 50 units.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction — excellent resistance to petroleum products
• Round cross section, 3 inches thick, with consistent dimensional tolerances
• Operating temperature range: -40 degrees F to 250 degrees F
• 70 Shore A hardness rating for reliable compression set performance
• Tear and abrasion resistant for dynamic sealing applications
• Meets SAE and MIL-Spec standards

Compatibility

Compatible with petroleum-based products and fluids. Meets SAE and MIL-Spec standards for sealing applications. Designed as an OEM-style replacement or new-installation seal for large-diameter industrial hydraulic, pneumatic, and fluid-handling equipment. Not FDA approved — not intended for food-grade applications.

Installation Notes

Installation is typically performed by licensed plumbers, pipefitters, or industrial maintenance technicians. Depressurize and drain the system completely before removing any existing seals or fittings. Lubricate the O-ring with a compatible petroleum-based lubricant during installation to reduce the risk of tearing or rolling. Do not store Buna-N O-rings in direct sunlight or near motors and other electrical equipment that may generate ozone, as ozone exposure degrades nitrile elastomers.