Buna-N

Buna-N quad rings, also called X-rings, are four-lobed elastomer sealing components used in compatible plumbing, pump, fluid-system, maintenance, and repair assemblies. The products represented here are black nitrile rings for applications involving petroleum-based fuels and lubricants, with listed sizes for matching replacement or specification requirements.

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Helpful Buying Guide

Buna-N Quad Ring Buying Guide

Choose a Buna-N quad ring by matching the required X-ring profile, inside diameter, outside diameter, material, hardness when listed, and any stated order quantity. These rings are intended for compatible equipment and sealing locations that call for a four-lobed seal.

Visual Guide

Popular examples in this category

Buna-N 342 Quad Ring, 3-5/8 in. ID x 4 in. OD, BlackBuna-N 342 Quad Ring, 3-5/8 in. ID x 4 in. OD, BlackWBB1372050Black Buna-N Quad Ring, 2-5/8 in. ID x 3 in. OD, 70 DurometerBlack Buna-N Quad Ring, 2-5/8 in. ID x 3 in. OD, 70 DurometerWBB1371903Black Nitrile 328 Quad Ring, 1-7/8 in. ID x 2-1/4 in. OD, 70 DurometerBlack Nitrile 328 Quad Ring, 1-7/8 in. ID x 2-1/4 in. OD, 70 DurometerWBB1371935Black Buna-N 228 Quad Ring, 2-1/4 in. ID x 2-1/2 in. ODBlack Buna-N 228 Quad Ring, 2-1/4 in. ID x 2-1/2 in. ODWBB1371769
Use Cases

Replacement sealing components

Use quad rings when compatible equipment requires an X-ring-style elastomer seal for maintenance, repair, plumbing, pump, or fluid-system work.

How to Choose

Match the required dimensions

Compare the listed inside diameter and outside diameter with the existing ring or equipment requirement, then confirm that a quad-ring profile is specified.

Applications

Petroleum-based fluid environments

The represented Buna-N and nitrile rings are described for applications involving petroleum-based fuels and lubricants.

Additional Information

Check hardness and order quantity

Many listed rings have a 70 durometer rating. Review individual listings for stated minimum order quantities, including select products with minimums of 8, 10, or 52.

1 in.Smallest listed inside diameter

The represented 214 quad ring has a 1 in. inside diameter.

9-1/4 in.Largest listed inside diameter

The represented X-ring size range includes a 9-1/4 in. inside diameter.

70Common listed durometer

Many of the represented Buna-N and nitrile quad rings are listed at 70 durometer.

4-lobedRing profile

Quad rings and X-rings use a four-lobed sealing form for compatible applications.

Comparison Guide

Compare the listed quad ring options

Use dimensions, stated hardness, and ordering details to distinguish the represented Buna-N and nitrile X-ring styles.

Selection factorWhat is representedWhat to check
ProfileQuad ring and X-ring designs with a four-lobed formConfirm the equipment requires this sealing profile.
SizeInside diameters from 1 in. to 9-1/4 in. are represented, with corresponding listed outside diametersMatch both the inside and outside diameter to the required fit.
Hardness and orderingMany options are listed at 70 durometer; select listings have stated minimum quantitiesVerify the required hardness and any minimum order quantity on the product listing.
Planning Guide

Plan the right fit before choosing

Start with fit and profile

Confirm that the equipment calls for a quad ring or X-ring

A quad ring has a four-lobed sealing profile. Select it for compatible sealing assemblies designed to use this configuration, rather than relying on diameter alone.

  • Match the required quad-ring or X-ring profile.
  • Verify the inside diameter and outside diameter.
  • Use the listed size to identify a compatible replacement location.
Match the material requirement

Choose Buna-N or nitrile for the stated fluid exposure

The products in this category are described as Buna-N or nitrile rubber sealing components for applications involving petroleum-based fuels and lubricants.

  • Confirm that nitrile or Buna-N is the material specified for the application.
  • Review the listed 70 durometer requirement where provided.
  • Select the black finish when a black sealing component is required.
Plan the purchase

Review listing-specific ordering details

Sizes vary from compact rings to larger sealing components. Certain listings also state effective minimum order quantities, so confirm the product details before planning a purchase.

  • Compare dimensions carefully between similarly sized rings.
  • Check whether 70 durometer is listed for the selected ring.
  • Note stated minimum quantities on applicable listings.
FAQ

Common questions before buying

What is a Buna-N quad ring?

A Buna-N quad ring is a four-lobed elastomer sealing component, also called an X-ring, for compatible sealing applications.

What sizes are represented in this category?

Listed inside diameters range from 1 in. to 9-1/4 in., with product-specific outside diameters provided for fitment matching.

Are these rings listed for petroleum-based fuels and lubricants?

Yes. The represented Buna-N and nitrile rings are described for applications involving petroleum-based fuels and lubricants.

Are all listed rings 70 durometer?

Many listings specify 70 durometer. Check the individual product details, as not every summary states a durometer rating.

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