Value Collection ZMSCH90042 O-ring Dash 042 Nbr 90 Duro

Product Description

The VALUE COLLECTION ZMSCH90042 is a Dash 042 Buna-N (Nitrile Butadiene Rubber) O-ring engineered for sealing applications that require resistance to petroleum-based fluids and hydraulic media. Measuring 3.25 inches inside diameter with a 3.375 inch outside diameter and a 0.0625 inch (1/16 inch) cross-section thickness, this O-ring carries a 90 durometer hardness rating, classifying it as extra hard. That elevated hardness improves resistance to extrusion under pressure. The operating temperature range spans -40 degrees F to 250 degrees F, making it suitable for a wide range of industrial and mechanical service conditions. Licensed trades and maintenance technicians working with fluid power, pneumatic, or plumbing systems regularly specify this profile.

This O-ring is suited for static and dynamic sealing in applications where contact with petroleum products, oils, fuels, and hydraulic fluids is expected. The Buna-N elastomer is the most widely used O-ring material in industrial and mechanical service due to its reliable compression set characteristics and its tear and abrasion resistance. Common install scenarios include pump housings, valve bodies, cylinder heads, fittings, and fluid-handling equipment in commercial, industrial, and trade service environments. The Dash 042 designation is a standard AN/SAE size reference used across fluid power and general industrial hardware. Package quantity is 50 pieces per order.

Key Features

• Buna-N (NBR) elastomer — excellent resistance to petroleum products, hydraulic fluids, and oils
• 90 durometer extra-hard rating improves extrusion resistance under elevated pressure
• Operating range of -40 degrees F to 250 degrees F for broad service compatibility
• Standard Dash 042 size designation for direct cross-reference to AN/SAE hardware specifications
• Round cross-section profile with consistent 0.0625 inch thickness for reliable groove seating
• Meets SAE and MIL-Spec standards

Compatibility

Compatible with petroleum products and petroleum-based hydraulic media. Designed as a standard Dash 042 O-ring replacement for use in any application calling for a 3.25 inch ID Buna-N O-ring meeting SAE or MIL-Spec dimensional standards. Not recommended for exposure to direct sunlight during storage or proximity to motors and electrical equipment that generate ozone.

Installation Notes

O-ring installation is performed by qualified mechanics, plumbers, or fluid power technicians depending on the system type. Before replacing any O-ring, depressurize and de-energize the system completely and drain any residual fluid from the component. Lubricate the O-ring with a compatible fluid or O-ring lubricant before seating it in the groove to prevent tearing during assembly. Avoid twisting or spiraling the ring during installation, as cross-sectional deformation will cause premature seal failure.