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12 BUNA O-RING

Description & Features

The 12 BUNA O-RING by Brennan Industries Inc. is designed for robust face seal applications. Crafted from 90 Durometer NBR this O-ring ensures dependable sealing performance suitable for various industrial environments. It features an inner diameter of 0.739 inches and a width of 0.070 inches fitting perfectly for a tube outer diameter of 3/4 inches.

Specifically developed under the FS4000 series this O-ring stands out for its durability and effectiveness in preventing leaks and maintaining seal integrity. The high-quality Buna-N material offers excellent resistance to oil petroleum and various chemicals which makes it ideal for demanding operational conditions.

Additionally the precision manufacturing process guarantees a reliable fit and function crucial for maintaining the efficiency and longevity of industrial machinery and equipment.

Supplier Part Number: FS4000-12

MPN: FS4000-12

Specifications

Brand BRENNAN	Color Black	Dash Size 12	Dimensions 0.07 in W	Durometer 90	Inside Diameter 0.61 in	Material Nitrile	Series FS4000 Series	Suitable For Use With 3/4 in Tube OD ORFS

Product Questions & Answers (1)

Question by: Carl G on Nov 20, 2025, 10:32 AM

got a 3/4 tube and need the face seal o-ring, is this the right size?

Answer by: Customer Support on Nov 21, 2025, 6:35 PM

For a 3/4 inch tube OD face seal setup, this one matches the intended fit. It is the FS4000 series size 12 with a 0.739 inch ID and 0.070 inch width.