Value Collection ZMSCH70249 O-ring Dash 249 Nitrile

Product Description

The VALUE COLLECTION ZMSCH70249 is a Dash 249 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in sealing applications. It measures 4.875 inches inside diameter and 5.125 inches outside diameter, with a 0.125 inch cross-section thickness and a round cross-section profile. Rated at 70 Shore A hardness, this O-ring handles temperatures from -40 degrees F to 250 degrees F and delivers reliable sealing in systems exposed to petroleum-based fluids. Licensed plumbers, HVAC technicians, and hydraulic system technicians install this type of seal across a broad range of fluid-handling equipment.

This O-ring is suited for use in hydraulic, pneumatic, and fluid-transfer applications where petroleum product exposure is common. Its Buna-N compound provides excellent resistance to oils, fuels, and hydraulic fluids, along with good compression set resistance and strong tear and abrasion resistance. It is appropriate for residential and commercial plumbing, HVAC refrigerant-adjacent sealing, and industrial fluid system maintenance. The part is sold in a package quantity of 10, with a minimum order quantity of 1.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction offers excellent resistance to petroleum products, oils, and fuels
• Rated from -40 degrees F to 250 degrees F for wide-range temperature service
• 70 Shore A hardness with round cross-section for reliable static and dynamic sealing
• Good compression set resistance reduces leak risk over extended service life
• Tear and abrasion resistance supports use in higher-wear sealing environments
• Meets SAE and MIL-Spec standards

Compatibility

Compatible with petroleum-based fluid systems. Designed as a standard Dash 249 O-ring replacement suitable for hydraulic, pneumatic, and fluid-handling assemblies specifying a 4.875 inch ID, 5.125 inch OD, 0.125 inch cross-section Buna-N seal.

Installation Notes

Installation should be performed by a qualified plumber, HVAC technician, or hydraulic systems technician following applicable codes. Depressurize and drain the system fully before removing the existing O-ring. Inspect the seating groove for damage or debris before installing the new seal. Do not store O-rings in direct sunlight or near motors or other electrical equipment that may generate ozone, as this degrades Nitrile rubber over time.