Value Collection ZMSCH90355 O-ring Dash 355 Nitrile 90A

Product Description

The VALUE COLLECTION ZMSCH90355 is a Dash 355 O-ring made from Nitrile Butadiene Rubber (Buna-N), one of the most widely used elastomers in fluid sealing applications. It measures 5.25 inches inside diameter, 5.625 inches outside diameter, and 0.1875 inches thick with a round cross section. Rated at 90 durometer (extra hard), it delivers firm compression set resistance along with strong tear and abrasion resistance. The temperature range of -40 to 250 degrees F makes it suitable for a broad range of industrial, plumbing, and HVAC service environments. Licensed tradespeople and maintenance technicians working on hydraulic, pneumatic, or fluid systems will find this a direct-fit static or dynamic seal option.

This O-ring is used in applications involving petroleum-based fluids, oils, fuels, and hydraulic media. Its Buna-N compound provides excellent resistance to petroleum products, making it a common choice in HVAC compressor fittings, plumbing unions, hydraulic cylinders, and general industrial equipment. The Dash 355 sizing designation is a standard AS568 reference, ensuring cross-compatibility with equipment specifying that dash number. It is not recommended for use in ozone-heavy environments or where prolonged UV exposure is expected. Store away from direct sunlight and ozone-generating electrical equipment.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction with excellent petroleum product resistance
• 90 durometer extra-hard rating for strong compression set and abrasion resistance
• Operating temperature range: -40 to 250 degrees F
• Round cross section, Dash 355 standard sizing (AS568-compatible)
• Meets SAE and MIL-Spec standards
• Sold in packages of 10 with a minimum order quantity of 1

Compatibility

Designed for use with petroleum products and compatible fluid media. Meets SAE and MIL-Spec standards for Dash 355 O-ring applications. Not FDA approved; not suitable for food-contact or strong ozone-exposure environments.

Installation Notes

O-ring installation should be performed by a qualified technician following system lockout and depressurization procedures. Lubricate the O-ring with a compatible fluid or grease before seating to prevent twisting or pinching during assembly. Avoid stretching the O-ring beyond its design limits during installation. Do not install in grooves with sharp edges that could cut or nick the elastomer.