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04 BUNA O-RING

Description & Features

The 04 BUNA O-RING by Brennan Industries Inc. offers a reliable sealing solution with precision dimensions including an inside diameter of 0.301 inches and a width of 0.070 inches. This high-quality face seal O-ring features a 90 durometer NBR ensuring durability and resistance in demanding industrial environments.

Series: FS4000

Tube O.D.: 1/4

Supplier Part Number: FS4000-04

Specifications

Color Black	Dash Size 04	Dimensions 0.07 in W	Durometer 90	Inside Diameter 0.3 in	Material Nitrile	Series FS4000 Series	Suitable For Use With 1/4 in Tube OD ORFS

Product Questions & Answers (2)

Question by: Donna W on Oct 11, 2025, 8:50 AM

what size tube does this o-ring go with, the 1/4 inch?

Answer by: Customer Support on Oct 12, 2025, 9:50 AM

the FS4000-04 is sized for 1/4 inch tube O.D. face seal connections. The inside diameter runs 0.301 inches with a width of 0.070 inches, so it fits right into that FS4000 series face seal groove without any fuss.

Question by: Steve C on May 24, 2025, 4:30 PM

got a face seal fitting for 1/4 tube, is this the right little o-ring for it

Answer by: Customer Support on May 25, 2025, 9:22 PM

For FS4000 face seal setups that use 1/4 inch tube O.D., this is the matching size called out for the 04 face seal O-ring. The dimensions are 0.301 inch inside diameter and 0.070 inch width.