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Ten black Buna-N O-rings, 3.4 in inside diameter, round cross-section

Zoro Select

Zoro Select O-Ring 3-1/2 in Buna-N Black PK10 70417

SKU CH-11FW-4WPV9

Pack of ten Buna-N O-rings with a 3.4 in inside diameter and 0.275 in cross-section, rated for -40 to 250 °F and FDA approved

  • FDA-approved Buna-N material suits food-contact applications
  • 10-piece pack covers multiple maintenance tasks at once
  • Wide -40 °F to 250 °F range handles extreme temperature swings
  • 70 A durometer resists extrusion in high-pressure static seals
  • Precise 3.4 in ID and 0.275 in width ensure reliable fit

O-Ring Buna-N 3-1/2 in Pack of 10

The Zoro Select O-Ring kit supplies ten black Buna-N seals with a 3.4 inch inside diameter and 0.275 inch cross-section. Dash number 417 identifies the size for maintenance teams ordering by spec. Medium-hard 70A durometer material suits general-purpose fluid sealing tasks.

Fits 4 inch nominal groove frees inventory space

Each ring seats in a 4 inch nominal outside diameter groove, matching the 4.025 inch actual outside diameter. The pack of ten reduces reorder frequency for facilities that standardise on this size. FDA-approved material allows use in food-contact systems without additional certification steps.

Withstands -40 to 250 degrees F

Buna-N compound remains flexible at minus 40 degrees Fahrenheit and resists degradation up to 250 degrees Fahrenheit. Metal-detectable construction supports contamination control in processing lines. No X-ray detectable property is present, so inspection methods must account for that limitation.

How it compares

Measured against everything we stock in Threadlockers & Sealants, at today’s prices. Recalculated every night.

Price $14.99
Pricier than about 70% of the 147 comparable items (median $11.99).

Specifications

Product
Brand nameZORO SELECT

Questions about this item

What temperature limit appears first when these O-rings run continuously in a hot system?

The Buna-N material is rated for a maximum continuous temperature of 250 degrees F before the seal begins to degrade.

How much heat or swelling should I expect from the Buna-N compound after all-day exposure to oil and pressure?

The 70A durometer Buna-N resists common hydraulic fluids and petroleum oils with minimal swell, staying stable through the full -40 to 250 degrees F range.

Which groove dimensions must my hardware already have for dash number 417 to seal correctly?

The groove needs a 3.4 inch inside diameter and a 0.275 inch cross-section width to match the actual ring dimensions of this dash-417 size.

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