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Black rectangular Buna-N O-rings, dash 113, pack of 100

Zoro Select

Zoro Select Square Buna-N O-Ring Dash 113 PK100

SKU CH-MA3V-2CG2Z

Pack of 100 Buna-N square-profile O-rings, dash 113, 0.5 in. ID, 0.103 in. cross-section, FDA-approved, -40 °F to 250 °F

  • FDA-approved Buna-N material for food-safe sealing
  • Dash 113 square profile fits 9/16 in ID grooves
  • 100-piece pack covers high-volume maintenance needs
  • 70A durometer resists extrusion under pressure
  • 40 °F to 250 °F range handles extreme temperatures

Square Buna-N O-Ring Pack

This pack contains 100 square-profile Buna-N O-rings sized to Dash 113. Each ring has a nominal inside diameter of 9/16 inch and a cross-section width of 3/32 inch. The material carries a 70A durometer rating for medium-hard sealing performance. They are FDA approved and coloured black for easy identification.

Suits Static Inch-Seal Jobs

These rings suit maintenance teams that need inch-dimension static seals in hydraulic or pneumatic systems operating between -40 and 250 degrees Fahrenheit. The metal-detectable compound helps quality-control lines spot contamination. Buyers who need X-ray detectable seals or metric-dimension O-rings should look at alternative product lines.

Dash 113 Size Decides Fit

The Dash 113 designation fixes the critical dimensions: actual inside diameter 0.5 inch, actual width 0.103 inch and actual outside diameter 0.755 inch. Matching this dash number to the groove specification is the single step that confirms the part will seal correctly.

Highlights

  • FDA-approved Buna-N material for food-safe sealing
  • Dash 113 square profile fits 9/16 in ID grooves
  • 100-piece pack covers high-volume maintenance needs
  • 70A durometer resists extrusion under pressure
  • 40 °F to 250 °F range handles extreme temperatures

Specifications

BrandZORO SELECT

Questions about this item

What groove width and depth are needed for the 3/32 in nominal cross-section of these Buna-N rings?

The rings have an actual width of .103 in and a cross-section shape listed as rectangular, so the groove must accommodate that width and the corresponding depth for a dash 113 profile.

Will the 70A durometer and .103 in actual width seal effectively against a mating surface finished to 16 µin Ra?

A 70A durometer Buna-N ring with .103 in width is designed to conform to standard gland finishes; a 16 µin Ra surface is within typical sealing recommendations for this hardness.

After installation, how can I confirm the 9/16 in nominal ID rings are seated correctly in a .5 in bore?

Measure the installed outside diameter — it should read approximately .755 in — and verify no visible twist or extrusion; the black color also aids visual inspection in the groove.

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