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12 BUNA O-RING

Description & Features

Engineered for robust sealing in hydraulic systems, the 12 BUNA O-RING is crafted from 90 Durometer NBR material, ensuring excellent resistance to oils, fuels, and other aggressive fluids. With an inside diameter of 0.924 mm and a tube OD of 3/4, this O-ring is designed to fit MORB/SAE ports precisely, offering reliable performance in demanding environments.

Manufactured by Brennan Industries, this O-ring belongs to the 4000 series and is a trusted component for industrial applications requiring durable and dependable sealing solutions. The NBR construction provides flexibility and resilience, making it ideal for use in various hydraulic applications where maintaining a secure seal is critical.

SKU: 4000-12

Supplier Part Number (MPN): 4000-12

Specifications

Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 4000-12	Product Weight 0.00 lbs

Product Questions & Answers (3)

Question by: Dwayne S on Jun 27, 2025, 7:38 AM

got a MORB/SAE port that takes a size 12 o-ring, is this the right one for a 3/4 tube OD?

Answer by: Customer Support on Jun 28, 2025, 12:00 PM

For a MORB/SAE port that calls for a 12 O-ring with a 3/4 tube OD, this one matches that fit. It is the Brennan 4000 series 12 BUNA O-ring (SKU 4000-12) made for MORB/SAE port sealing.

Question by: Norm E on Sep 1, 2025, 5:41 PM

I need an o-ring that can handle some pretty harsh fluids. Will this Buna one do the trick?

Answer by: Customer Support on Sep 3, 2025, 12:14 PM

Crafted from 90 Durometer NBR material, this O-ring offers excellent resistance to oils, fuels, and other aggressive fluids, making it a solid choice for demanding hydraulic systems.

Question by: Ray R on Apr 2, 2026, 6:23 PM

Got a 3/4 tube OD line running into a MORB port on a hydraulic manifold. This the right o-ring for that setup?

Answer by: Customer Support on Apr 4, 2026, 11:49 AM

For a 3/4 tube OD MORB/SAE port, yes, that's exactly what this one is sized for. The inside diameter is 0.924mm and it's built specifically to seat in that port configuration. NBR construction at 90 durometer means it holds up well against hydraulic oils and the pressure cycling that comes with manifold work.