Value Collection ZMSCH90129 O-ring Dash 129 Nbr 90D 50-pack

Product Description

The VALUE COLLECTION ZMSCH90129 is a Dash 129 nitrile butadiene rubber (NBR) O-ring used to create static and dynamic fluid seals in hydraulic, pneumatic, and plumbing assemblies. It measures 1.563 inches inside diameter and 1.750 inches outside diameter, with a cross-sectional thickness of 0.103 inches (3/32 inches). The compound is rated at 90 durometer, placing it in the extra-hard hardness category. This O-ring is black, round in cross section, and rated for service from -40 degrees F to 250 degrees F. Plumbers, hydraulic technicians, and mechanical tradespeople install this type of seal during equipment overhaul, valve service, and pump repair work.

Buna-N O-rings in the Dash 129 size are widely used in residential and commercial fluid-handling systems where petroleum-based media contact is expected. Typical applications include valve bodies, cylinder heads, pipe fittings, and pump housings that handle oils, fuels, and hydraulic fluids. The 90 durometer rating makes this ring appropriate for high-pressure environments where a softer compound would extrude or deform under load. This SKU ships in a package quantity of 50 units, making it suitable for shop-stock replenishment or multi-unit service calls. Compatible materials include petroleum products per the product specifications.

Key Features

• Nitrile butadiene rubber (Buna-N) compound — the most widely used O-ring elastomer for petroleum-product resistance
• 90 durometer extra-hard rating for high-pressure dynamic and static sealing applications
• Operating range of -40 degrees F to 250 degrees F suits most industrial and HVAC fluid systems
• Excellent compression set, tear resistance, and abrasion resistance for long service life
• Round cross section, Dash 129 sizing — 1.563 inches ID, 1.750 inches OD, 0.103 inches thick
• Meets SAE and MIL-Spec standards; package quantity of 50 supports bulk service work

Compatibility

Compatible with petroleum products per manufacturer specifications. Designed as a standard Dash 129 NBR O-ring replacement for hydraulic, pneumatic, and plumbing assemblies requiring a 1.563-inch inside diameter seal. Should not be used with equipment where ozone exposure, direct sunlight storage, or incompatible chemical media are present.

Installation Notes

Installation of O-rings should be performed by a qualified mechanic, plumber, or hydraulic technician following the equipment manufacturer's service procedures. Always de-pressurize and isolate the system before removing any existing seals or fittings. Lubricate the O-ring with a compatible fluid or assembly grease before seating to prevent twisting or tearing during installation. Do not store unused O-rings in direct sunlight or near motors and other electrical equipment that may generate ozone, as this degrades the elastomer.