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20 BUNA O-RING

Description & Features

Designed for use in face seal fitting assemblies, this 90 durometer NBR o-ring provides a reliable static seal in hydraulic line connections. The higher durometer rating suits applications where firmer compression resistance is required, helping maintain seal integrity under pressure cycling and mechanical load.

The 20 BUNA O-Ring from Brennan Industries fits the FS4000 series face seal configuration, with an inner diameter of 1.176 inches and a cross-section width of 0.070 inches, sized for 1-1/4 inch tube OD connections. NBR (Buna-N) compound offers broad compatibility with petroleum-based hydraulic fluids commonly found in industrial hydraulic systems.

SKU: FS4000-20

Supplier Part Number (MPN): FS4000-20

Specifications

Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number FS4000-20	Product Weight 0.99 lbs

Product Questions & Answers (2)

Question by: Lyle B on Apr 1, 2026, 7:50 AM

got a face seal fitting in the FS4000 series, is this the right o-ring for a 1-1/4 tube OD?

Answer by: Customer Support on Apr 2, 2026, 9:10 PM

For an FS4000 series face seal setup on a 1-1/4 inch tube OD connection, this is the matching size. It is the FS4000-20 o-ring with a 1.176 inch inner diameter and a 0.070 inch cross-section.

Question by: Danny G on Mar 14, 2026, 11:14 AM

How tight do these o-rings need to be? I'm worried about squishing them too much.

Answer by: Customer Support on Mar 16, 2026, 6:43 AM

Designed for face seal fittings, this 90 durometer o-ring requires a firm compression to maintain a reliable static seal, especially under pressure cycling. The higher durometer rating helps it resist deformation.