Value Collection ZMSCH70MD012 O-ring Dash 012 Nbr 25 Pack

Product Description

The VALUE COLLECTION ZMSCH70MD012 is a Dash 012 Nitrile Butadiene Rubber (Buna-N) O-ring with a round cross section, measuring 0.375 inches inside diameter, 0.500 inches outside diameter, and 0.0625 inches thick. Sold in packs of 25, these O-rings carry a Shore A hardness rating of 70 and are rated for service from -40 degrees F to 250 degrees F. Buna-N is the most widely used O-ring elastomer in the trade, offering excellent resistance to petroleum-based fluids, strong compression set characteristics, and solid tear and abrasion resistance. HVAC technicians, plumbers, and general mechanical contractors use this size routinely in valve assemblies, fittings, and fluid-system connections.

These O-rings are suited for residential and commercial plumbing, HVAC refrigerant-side fittings, hydraulic connections, and other applications where contact with petroleum products is expected. The Dash 012 designation is a standard AN/AS568 size reference recognized across supply chains, making sourcing and replacement straightforward. The black Buna-N compound performs reliably in both static and dynamic sealing applications where temperatures stay within the rated range. Note that these O-rings are not FDA approved for food-contact use, though the product carries a Metal Detectable FDA additional classification.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction with excellent petroleum-product resistance
• Rated operating range of -40 degrees F to 250 degrees F
• Shore A hardness of 70 for a hard, durable seal
• Round cross section for consistent seating in standard O-ring grooves
• Dash 012 standard sizing for easy cross-reference and replacement
• Pack of 25 units per package — minimizes downtime on multi-point service calls

Compatibility

Designed for use with petroleum-based fluids and compatible with standard AN/AS568 Dash 012 O-ring groove dimensions. Suitable for static and dynamic sealing applications in HVAC, plumbing, and general mechanical systems where Buna-N elastomer is appropriate. Store away from direct sunlight, motors, and electrical equipment that may generate ozone to preserve elastomer integrity.

Installation Notes

Licensed plumbers, HVAC technicians, and mechanical contractors typically install O-rings of this type. Before replacing an O-ring in any pressurized system, shut off fluid supply and relieve all system pressure. Lubricate the O-ring with a compatible fluid or approved O-ring lubricant before seating to reduce the risk of tearing during installation. Do not over-stretch or twist the O-ring when placing it in the groove.