Value Collection ZMSCH70158 O-ring Dash 158 Buna-n

Product Description

The VALUE COLLECTION ZMSCH70158 is a Dash 158 O-ring made from Nitrile Butadiene Rubber (Buna-N), one of the most widely used elastomers in fluid sealing applications. It measures 4.75 inches inside diameter and 4.9380 inches outside diameter with a 0.0937-inch (3/32 inch) round cross section. The 70 durometer hardness rating provides a firm seal with strong resistance to compression set, tear, and abrasion. Licensed plumbers, hydraulic system technicians, and industrial maintenance professionals install this part wherever petroleum-based fluid containment is required. It meets SAE and MIL-Spec standards.

This O-ring is suited for use in hydraulic systems, pneumatic assemblies, pumps, valves, and pipe fittings that handle petroleum-based fluids. Its operating temperature range of -40 degrees F to 250 degrees F makes it appropriate for both refrigeration-adjacent and high-temperature service environments. The round cross-section profile seats reliably in standard Dash 158 O-ring grooves. It is sold in packages of 25, making it practical for service technicians who need spares on hand for repeat maintenance tasks.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction offers excellent resistance to petroleum products and hydraulic fluids
• 70 Shore A durometer hardness rated Hard for reliable compression sealing
• Operating temperature range: -40 degrees F to 250 degrees F
• Round cross-section profile fits standard Dash 158 O-ring grooves
• Meets SAE and MIL-Spec standards
• Sold in packages of 25 for high-volume service use

Compatibility

Designed as a standard Dash 158 O-ring replacement for use in hydraulic, pneumatic, and fluid-handling assemblies that require a 4.75-inch ID Buna-N seal compatible with petroleum products. Not approved for FDA food-contact applications.

Installation Notes

Depressurize and drain the system before removing the old O-ring to prevent fluid release and injury. Inspect the groove for nicks, corrosion, or debris before seating the new ring. Apply a light coat of compatible lubricant to ease installation and reduce the risk of tearing the elastomer during assembly. Do not store unused O-rings in direct sunlight or near motors, transformers, or other ozone-generating electrical equipment, as ozone degrades Buna-N over time.