Value Collection ZMSCH70FDA331 O-ring Dash 331 Buna-n Fda

Product Description

The VALUE COLLECTION ZMSCH70FDA331 is a Dash 331 Buna-N (nitrile butadiene rubber) O-ring with a round cross section, rated at 70 Shore A hardness and approved to FDA standards. It measures 2.225 inches inside diameter, 2.625 inches outside diameter, and 0.1875 inches thick. Buna-N is the most widely used O-ring elastomer in fluid sealing applications, offering excellent resistance to petroleum products, strong compression set performance, and solid tear and abrasion resistance. Licensed HVAC techs, plumbers, and industrial maintenance professionals reach for this material when sealing oil, fuel, or hydraulic circuits.

This O-ring is suited for static and dynamic sealing applications where the working fluid is a petroleum-based product, hydraulic oil, or similar compatible media. The operating temperature range spans -40 degrees F to 250 degrees F, making it appropriate for a broad range of residential and light commercial mechanical systems. The FDA-approved white Buna-N compound also makes it acceptable for certain food-processing and potable-water-adjacent applications where regulatory compliance is required. The part ships in a package quantity of 10.

Key Features

• FDA-approved white Buna-N compound meets SAE and MIL-Spec standards
• Dash 331 standard sizing: 2.225 inches ID, 2.625 inches OD, 0.1875 inches thick
• Round cross section for consistent seating in standard O-ring grooves
• Rated -40 degrees F to 250 degrees F working temperature range
• Excellent resistance to petroleum products, hydraulic fluids, and oils
• Hard hardness rating (70 Shore A) provides strong compression set resistance

Compatibility

Compatible with petroleum products and similar hydrocarbon-based fluids. Designed as an OEM-style replacement or service O-ring for any application requiring a Dash 331 Buna-N seal per SAE or MIL-Spec tolerances. Not recommended for use with ozone, strong oxidizing agents, or applications involving prolonged exposure to direct sunlight or electrical equipment generating ozone.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or industrial maintenance mechanics. Always depressurize and drain the system before removing or installing O-rings. Lightly lubricate the O-ring with a compatible fluid or O-ring lubricant prior to seating to prevent tearing during assembly. Store unused O-rings away from direct sunlight, heat sources, and motors or other equipment that may generate ozone, as ozone degrades nitrile rubber over time.