Skip to the beginning of the images gallery

05 BUNA O-RING

Description & Features

This 05 Buna O-Ring is designed for MORB/SAE port connections. Constructed from 90 Durometer NBR, it ensures a reliable seal in hydraulic applications.

This O-ring fits a tube OD of 5/16. It is part of the 4000 Series from Brennan Industries. Note to California residents: This product carries a PROP-65 warning.

SKU: 4000-05

Supplier Part Number (MPN): 4000-05

Specifications

Color Black	Dash Size 05	Dimensions 0.072 in W	Durometer 90	Inside Diameter 0.41 in	Material Nitrile	Series SAE-J1926-ORB-O-ring Series	Suitable For Use With 5/16 in Tube OD ORB

Product Questions & Answers (2)

Question by: Cheryl S on Sep 13, 2025, 6:20 AM

got a MORB/SAE port that takes a 5/16 tube OD, is this the right little o-ring for it?

Answer by: Customer Support on Sep 14, 2025, 10:47 AM

For MORB and SAE port connections that correspond to a 5/16 inch tube OD, this 05 Buna O-ring is the intended seal. It is a 90 durometer NBR (Buna-N) O-ring from Brennan Industries 4000 Series.

Question by: Clint A on Feb 8, 2026, 8:42 PM

If I'm using this with a MORB/SAE port, it ought to seal up good, right?

Answer by: Customer Support on Feb 10, 2026, 6:26 AM

Designed specifically for MORB/SAE port connections, this Buna O-ring should provide a reliable seal when used correctly.