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Black rectangular Buna-N O-rings in a bulk pack of 100

Zoro Select

Zoro Select Buna-N O-Ring Dash 014 PK100

SKU CH-H855-AB858

Pack of 100 Buna-N O-rings with .4 in inside diameter and .07 in cross-section for -40 to 250 °F service

  • Metal-detectable Buna-N seals for food-safe lines
  • FDA-approved material meets regulatory requirements
  • 100-piece pack covers high-volume maintenance
  • Temperature range -40 to 250 °F suits extreme environments
  • Dash 014 rectangular profile fits standard grooves

Industrial Sealing Components

The Zoro Select Buna-N O-Ring Dash 014 arrives in a pack of 100 pieces for maintenance teams and assembly lines that need a reliable static seal. Each ring is moulded from black Buna-N rubber with a 70A durometer rating. The rectangular cross section measures 0.4 inches actual inside diameter and 0.07 inches actual width. The material withstands temperatures from -40 to 250 degrees Fahrenheit and carries FDA approval for incidental food contact.

Replacing Worn Round-Section Rings

These square-profile rings replace deteriorated round-section O-rings in hydraulic cylinders, pneumatic fittings and pump housings where extrusion resistance matters. The rectangular geometry distributes sealing force more evenly across the groove, reducing spiral failure during pressure spikes. The upgrade is worth it when existing seals show premature wear or when the application cycles frequently between vacuum and positive pressure.

Sustained Load Behaviour

Under continuous compression the Buna-N compound maintains its 70A hardness without significant stress relaxation across the rated temperature span. The metal-detectable additive allows automated inspection systems to locate fragments if a seal fails, while the material remains invisible to X-ray scanners. Dimensional stability holds the 0.629 inch actual outside diameter within tolerance during extended dwell times in oil, water or air service.

Highlights

  • Metal-detectable Buna-N seals for food-safe lines
  • FDA-approved material meets regulatory requirements
  • 100-piece pack covers high-volume maintenance
  • Temperature range -40 to 250 °F suits extreme environments
  • Dash 014 rectangular profile fits standard grooves

Specifications

BrandZORO SELECT

Questions about this item

What groove dimensions suit the 0.4 in actual inside diameter and 0.07 in actual width of these Buna-N O-rings?

The rings have an actual inside diameter of 0.4 in and an actual width of 0.07 in, so the groove must match those dimensions for a proper seal.

How are these rectangular-profile O-rings installed, and what common mistake should be avoided?

Lubricate each ring with compatible grease, seat the rectangular cross-section evenly in the groove without twisting, and avoid stretching the ring over sharp edges which can nick the Buna-N material.

When should the Dash 014 Buna-N O-rings be replaced based on their temperature rating and material hardness?

Replace them if they harden, crack, or lose elasticity after prolonged exposure near the 250 °F upper limit or the -40 °F lower limit, as the 70A durometer Buna-N will degrade over time.

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