Value Collection ZMSCH70328 O-ring Dash 328 Nitrile 70A

Product Description

The VALUE COLLECTION ZMSCH70328 is a Dash 328 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in sealing applications across HVAC, plumbing, hydraulic, and pneumatic systems. With a 1.875-inch inside diameter, 2.25-inch outside diameter, and 0.1875-inch cross-section thickness, this black, round-cross-section O-ring carries a Shore A hardness rating of 70. It is rated for service from -40 degrees F to 250 degrees F and offers proven resistance to petroleum-based fluids, compression set, tearing, and abrasion. Licensed tradespeople and maintenance technicians install this part as a precision sealing element wherever Buna-N compatibility is required.

This O-ring suits a broad range of residential and commercial applications involving petroleum-based media, including refrigerant oil circuits, fuel systems, hydraulic fittings, and general plumbing connections. Its Buna-N compound makes it the standard choice when sealing against oils, fuels, and petroleum derivatives. The round cross section seats cleanly in standard O-ring grooves machined to Dash 328 dimensions. Packages contain 50 pieces per unit, making them practical for service fleets and shop stock. This part meets SAE and MIL-Spec standards.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction with excellent petroleum product resistance
• 70 Shore A hardness for reliable compression set performance
• Operating range of -40 degrees F to 250 degrees F
• Round cross section seats in standard Dash 328 O-ring grooves
• Meets SAE and MIL-Spec standards
• Sold in a 50-piece package with a minimum order quantity of 1

Compatibility

Designed as an OEM-style replacement or service replacement for any application requiring a standard Dash 328 O-ring in Buna-N with a 70 Shore A hardness rating. Compatible with petroleum products; not recommended for exposure to ozone, direct sunlight during storage, or environments that generate ozone such as areas near electric motors.

Installation Notes

Plumbers, HVAC technicians, and hydraulic system technicians typically install O-rings of this type. Before replacing an O-ring, shut off fluid supply and depressurize the line or component completely. Lightly lubricate the O-ring with a compatible lubricant before seating to reduce installation stress and prevent twisting. Do not store unused O-rings in direct sunlight or near motors or other equipment that generates ozone, as this degrades the Buna-N compound.