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Black rectangular Buna-N O-rings in a pack of 50

Zoro Select

Zoro Select Buna-N O-Ring Dash 216 PK50

SKU CH-D7DB-D4711

Pack of 50 Buna-N O-rings, dash 216, 1.1 in inside diameter, 70A durometer, -40 to 250 °F

  • FDA-approved material for food-safe sealing
  • Buna-N withstands -40 °F to 250 °F
  • Metal-detectable for contamination control
  • Square profile ensures consistent compression
  • Pack of 50 covers multiple maintenance jobs

Sealing Components for Maintenance Kits

This pack supplies fifty Buna-N O-rings with a rectangular cross-section for static sealing tasks. The medium-hard 70A durometer material resists compression set across a broad temperature span. Each ring carries FDA approval for incidental food contact. The bulk quantity supports shop inventories and recurring service intervals.

Rectangular Profile and Dimensional Precision

The square profile distributes sealing force evenly across the groove faces to reduce extrusion risk. Actual inside diameter measures 1.1 inches while the width is .139 inches for consistent groove fit. Dash 216 sizing follows standard inch-based call-outs for quick cross-reference. Black colour aids visual inspection during assembly and teardown.

Replaces Worn Round-Cord Seals in Static Joints

Upgrading from standard round O-rings improves stability in wide or irregular grooves where rolling occurs. The rectangular section is worth the change when leakage traces appear at flange faces or valve bonnets. Not suited for dynamic piston or rod applications that demand continuous sliding motion.

Highlights

  • FDA-approved material for food-safe sealing
  • Buna-N withstands -40 °F to 250 °F
  • Metal-detectable for contamination control
  • Square profile ensures consistent compression
  • Pack of 50 covers multiple maintenance jobs

Specifications

BrandZORO SELECT

Questions about this item

What dash number and cross-section shape does this Buna-N O-ring use?

It uses dash number 216 with a rectangular cross-section profile.

What are the actual inside and outside diameters I need to match for a proper fit?

The actual inside diameter is 1.1 in and the actual outside diameter is 1.387 in.

How are these O-rings installed and what common mistake should I avoid?

Seat each ring into its groove without twisting; lubricate with compatible grease and never stretch the ring over sharp threads or edges during assembly.

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