Value Collection ZMSCH70355 O-ring Dash 355 Nbr 5.25 in Id

Product Description

The VALUE COLLECTION ZMSCH70355 is a Dash 355 Nitrile Butadiene Rubber (NBR) o-ring designed for sealing applications in fluid and pneumatic systems. It measures 5.25 inches inside diameter, 5.625 inches outside diameter, and 0.1875 inches thick with a round cross section. The compound is rated at 70 Shore A hardness, placing it in the hard hardness category. NBR is the most widely used o-ring elastomer in industrial and mechanical sealing, offering strong resistance to petroleum-based fluids along with reliable compression set, tear resistance, and abrasion resistance. Sold in a pack of 5 units.

This o-ring is suited for static and dynamic sealing applications where contact with petroleum products, hydraulic fluids, or oils is expected. Typical install scenarios include pump assemblies, hydraulic cylinders, pipe flanges, valve bodies, and fluid system fittings in industrial, HVAC, plumbing, and mechanical service environments. The temperature range of -40 degrees F to 250 degrees F makes it appropriate for a wide range of service conditions. This size is commonly installed by industrial maintenance technicians, plumbers, and HVAC service professionals.

Key Features

• Nitrile Butadiene Rubber (Buna-N) compound offers excellent resistance to petroleum products and hydraulic fluids
• 70 Shore A durometer hardness provides firm sealing under pressure with good compression set recovery
• Operating range from -40 degrees F to 250 degrees F covers most mechanical and HVAC service conditions
• Round cross section profile for consistent sealing in standard o-ring grooves
• Meets SAE and MIL-Spec standards
• Pack of 5 units per order

Compatibility

Compatible with petroleum products, hydraulic oils, and similar fluids. Designed as a standard Dash 355 o-ring replacement for any application calling for a Buna-N compound with a 5.25-inch inside diameter and 0.1875-inch cross section. Not recommended for use with ozone, direct sunlight exposure, or equipment generating ozone such as motors and certain electrical components.

Installation Notes

Power down or depressurize the system fully before servicing any sealing component. Clean the groove and mating surfaces before installing the o-ring to remove debris, old sealant, or damaged elastomer material. Apply a compatible lubricant to ease installation and prevent tearing during assembly. Follow applicable standards such as SAE or relevant industry codes for groove dimensions and surface finish requirements.