Skip to the beginning of the images gallery

04 BUNA O-RING

Description & Features

The 04 Buna O-Ring from Brennan Industries Inc ensures reliable sealing performance in industrial applications. Composed of 90 Durometer Nitrile Butadiene Rubber (NBR), it offers excellent resistance to wear and tear.

This O-ring is specifically designed for MORB/SAE ports, delivering dependable sealing solutions in various industrial environments. With an internal diameter of 0.351 mm and a tube outer diameter of 1/4", it fits seamlessly into designated components to prevent leaks.

The raw material type being NBR provides enhanced durability and a longer service life even under challenging conditions. It features an overall length of 0.072 mm, ensuring a snug fit and optimal flexibility.

Its series 4000 classification guarantees consistency in performance across different applications. This product adheres to industry standards and specifications, making it a suitable choice for professionals seeking reliable sealing options.

Supplier Part Number: 4000-04

California Residents: PROP-65 WARNING

Specifications

Color Black	Dash Size 04	Dimensions 0.072 in W	Durometer 90	Inside Diameter 0.35 in	Material Nitrile	Series SAE-J1926-ORB-O-ring Series	Suitable For Use With 1/4 in Tube OD ORB

Product Questions & Answers (2)

Question by: Phil P on May 28, 2025, 9:46 PM

got a 1/4" tube line coming off a MORB port that keeps seeping, this the right o-ring to fix that?

Answer by: Customer Support on May 30, 2025, 1:36 PM

For a 1/4" tube OD on a MORB/SAE port, yes, that's exactly what this one's built for. It's sized with an ID of 0.351mm and made from 90 durometer NBR, so it seats firm and holds up to the kind of wear that causes slow seeps over time. Part number is 4000-04 if you want to double-check it against your fitment before ordering.

Question by: Earl M on Apr 29, 2025, 8:29 PM

trying to swap out an o-ring on a 1/4 tube MORB/SAE port, is this the right size?

Answer by: Customer Support on May 1, 2025, 6:00 AM

For MORB/SAE port service on a 1/4 inch tube OD connection, this one matches that port style and size callout, and it uses an ID of 0.351 mm with a 0.072 mm overall length for the seal.