We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Pack of 100 black Buna-N O-rings 15mm ID 3.5mm cross section

Zoro Select

Zoro Select Buna-N O-Ring 3.5mm x 15mm ID PK100

SKU CH-7F56-CVK0N

Pack of 100 Buna-N O-rings with 15 mm inside diameter, 3.5 mm cross-section and 70A durometer, rated from -40 to 250 °F and FDA-approved

  • Metal-detectable Buna-N for food-safe sealing
  • 100-piece pack covers high-volume maintenance needs
  • 70A durometer resists extrusion at 22 mm OD
  • Wide -40 °F to 250 °F service temperature range
  • FDA-approved material meets regulatory compliance standards

Metric Buna-N O-Ring 15 mm ID

This pack contains one hundred black Buna-N O-rings with a 15 mm inside diameter and 3.5 mm cross section. They suit maintenance teams and engineers who need a ready supply of metric seals for hydraulic or pneumatic work. The medium-hard 70A durometer handles routine pressure cycles in industrial equipment.

Check groove dimensions and media compatibility

Verify that the gland depth matches the 3.5 mm cross section and that the 15 mm inside diameter seats against your shaft or bore. Confirm the fluid or gas is compatible with Buna-N and that the operating temperature stays within the minus 40 to 250 degrees F range. The material is FDA approved but not X-ray detectable.

Behaviour under sustained pressure and heat

The 70A durometer resists extrusion during prolonged pressurisation better than softer compounds. Buna-N maintains sealing force across the full rated temperature span without rapid stress relaxation. Metal-detectable fillers allow contamination control systems to spot fragments if a seal degrades in long service.

Highlights

  • Metal-detectable Buna-N for food-safe sealing
  • 100-piece pack covers high-volume maintenance needs
  • 70A durometer resists extrusion at 22 mm OD
  • Wide -40 °F to 250 °F service temperature range
  • FDA-approved material meets regulatory compliance standards

Specifications

BrandZORO SELECT

Questions about this item

What is included in the PK100 pack and what else is needed for installation?

The pack contains 100 black Buna-N O-rings with a 15 mm inside diameter and 3.5 mm cross-section. No installation tools or lubricants are included.

How do I choose between the listed dimensions for this O-ring?

This item is a single size: 15 mm inside diameter, 22 mm outside diameter and 3.5 mm cross-section. Select it when your groove matches those metric dimensions.

What does the 70A durometer rating mean once the ring is installed?

The 70A durometer gives a medium-hard feel that resists extrusion up to 250 °F and stays flexible down to -40 °F in hydraulic or pneumatic systems.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.