Value Collection ZMSCH90149 O-ring Dash 149 Nbr 90 Duro

Product Description

The VALUE COLLECTION ZMSCH90149 is a Dash 149 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in fluid sealing applications. It measures 2.813 inches inside diameter, 3 inches outside diameter, and 0.103 inches thick with a round cross section. Rated at 90 durometer (extra hard), this O-ring delivers excellent compression set resistance along with strong tear and abrasion resistance. The operating temperature range spans -40 to 250 degrees F, making it suitable for demanding environments in HVAC, plumbing, hydraulic, and pneumatic systems. Licensed trades and maintenance professionals rely on Buna-N rings for reliable sealing against petroleum-based fluids and lubricants.

This O-ring is suited for residential and commercial applications wherever a Dash 149 dimension seal is required. Typical use cases include valve packing, pump shaft seals, hydraulic cylinder end caps, refrigerant service fittings, and plumbing shutoff valve seats. Its compatibility with petroleum products makes it a standard choice for oil-wetted systems, fuel handling assemblies, and hydraulic circuits. It is not recommended for applications involving ozone exposure, direct sunlight storage, or proximity to motors and electrical equipment that generate ozone. This ring conforms to SAE and MIL-Spec standards and is sold in packages of 50 units.

Key Features

• Buna-N (Nitrile Butadiene Rubber) material with excellent resistance to petroleum products
• 90 durometer extra-hard rating for high-compression sealing applications
• Operating temperature range of -40 to 250 degrees F
• Round cross section, Dash 149 standard sizing
• Meets SAE and MIL-Spec standards
• Package quantity of 50 rings per order unit

Compatibility

Compatible with petroleum products, hydraulic oils, fuels, and lubricants. Designed as an OEM-style replacement or service seal for any application calling for a Dash 149 Buna-N O-ring with a 90 durometer hardness rating. Not compatible with ozone-generating environments or applications requiring FDA-approved elastomers.

Installation Notes

O-ring installation is performed by licensed plumbers, HVAC technicians, hydraulic system technicians, and qualified maintenance trades. Always relieve system pressure and isolate the fluid supply before removing or replacing any seal. Inspect the gland groove for damage, burrs, or debris before seating the new ring, and apply a compatible lubricant to ease installation and prevent rolling. Do not store unused rings in direct sunlight or near motors or other equipment that generates ozone, as this degrades the elastomer over time.