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Pack of five black Buna-N O-rings, 4-1/8 inch diameter, quarter-inch cross section

Zoro Select

Zoro Select O-Ring 4-1/8 in Buna-N Blk PK5

SKU CH-76VB-QVCS3

Pack of five Buna-N O-rings with 4.1 in inside diameter, 0.275 in width and 70A durometer for -40 to 250 °F service

  • Metal detectable for safety compliance
  • Buna-N withstands -40 to 250 °F
  • 70A durometer balances seal strength and flexibility
  • 1 in ID fits standard dash-422 grooves
  • Pack of five reduces per-unit cost

4-1/8 in Buna-N O-Ring Pack

This pack contains five black Buna-N O-rings with a 4-1/8 inch nominal inside diameter and 1/4 inch nominal width. They are made from medium-hard 70A durometer material suitable for general sealing tasks. Each ring is metal detectable but not X-ray detectable. The product is new and sold as a five-piece pack.

Build fit and installation needs

The rings have an actual inside diameter of 4.1 inches and an actual width of 0.275 inches, giving an actual outside diameter of 4.65 inches. They suit grooves machined to dash number 422 dimensions. The material operates from -40 to 250 degrees F. They are not FDA compliant, so they do not suit direct food or pharmaceutical contact.

Capacity limits and headroom

The 70A durometer handles moderate pressure and dynamic movement within the stated temperature range. Buna-N resists many oils and hydraulic fluids but degrades in ozone, ketones and strong acids. Metal detectability helps contamination control in processing lines. The lack of X-ray detectability and FDA compliance limits use in inspected food or medical flows.

Highlights

  • Metal detectable for safety compliance
  • Buna-N withstands -40 to 250 °F
  • 70A durometer balances seal strength and flexibility
  • 1 in ID fits standard dash-422 grooves
  • Pack of five reduces per-unit cost

Specifications

BrandZORO SELECT

Questions about this item

At what temperature does the Buna-N material reach its upper limit during continuous operation?

The O-ring is rated for a maximum temperature of 250 degrees Fahrenheit before the material begins to degrade.

How much heat does the seal generate when compressed in a gland all day?

As a static elastomer seal, the O-ring produces no heat of its own; any temperature rise comes from the surrounding fluid or hardware.

What gland dimensions must the existing hardware provide for this dash-422 ring to seal correctly?

The hardware needs a gland sized for a 4.1-inch inside diameter and a 0.275-inch cross-section to match the ring's actual dimensions.

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