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#2 FORB TO 1/8 MNPT

Description & Features

Manufactured from straight steel, this straight adapter from Brennan Industries connects a #2 Female SAE O-Ring Boss port to a 1/8 Male NPTF fitting in a single compact unit. The Female ORB end conforms to SAE J514, with a 5/16-24 thread size, while the Male NPTF end meets SAE J476 at a 1/8-27 thread size. Overall installed length is 1.150 mm, making it well suited for space-constrained hydraulic circuits where a direct, leak-resistant transition between ORB and NPTF connections is required.

The #2 FORB to 1/8 MNPT is a practical choice for hydraulic systems requiring a reliable thread form change at a port or valve body. The NPTF thread design provides a pressure-tight mechanical seal without relying solely on thread sealants, while the ORB end seats against an O-ring for positive sealing at the mating port. California residents should note that this product is subject to Proposition 65 warnings per Brennan Industries.

SKU: 6404-02-02

Supplier Part Number (MPN): 6404-02-02

Specifications

Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 6404-02-02	Product Weight 0.06 lbs

Product Questions & Answers (3)

Question by: Rex B on Aug 22, 2025, 4:18 PM

What size is the female end of this thing?

Answer by: Customer Support on Aug 23, 2025, 4:33 PM

The female SAE O-ring boss (FORB) side is 5/16-24.

Question by: Roy C on Mar 9, 2026, 9:17 AM

trying to hook a #2 female o-ring boss port up to 1/8 pipe, is this the right straight adapter?

Answer by: Customer Support on Mar 11, 2026, 6:55 AM

For that combo, it matches up as a straight steel fitting with a #2 Female SAE O-Ring Boss thread on one end (5/16-24, SAE J514) and a 1/8-27 Male NPTF thread on the other end (SAE J476).

Question by: Dean C on Aug 30, 2025, 6:48 AM

what's the thread setup on this fitting, one end NPT and the other some kind of o-ring boss?

Answer by: Customer Support on Sep 1, 2025, 6:43 AM

Yeah, that's right. One end is a 1/8-27 Male NPTF thread, which is your standard tapered pipe thread that seals by thread engagement. The other end is a Female SAE O-Ring Boss, sized 5/16-24, which seals with an o-ring at the boss face rather than relying on thread taper. Both ends meet SAE specs, B1 to SAE J514 and B2 to SAE J476.