#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

Connection Size 1
1/8 in
Connection Size 2
1/8 in
Connection Type
Female SAE ORB, MNPT
Connection Type 1
Female SAE ORB
Connection Type 2
MNPTF
Dimension Standards
SAE J1926, SAE J476, SAE J514
Dimensions
1.15 in L
Finish
Trivalent Zinc-Plated
Fitting Type
Adapter
Hex Size
0.563 in
Material
Steel
Material Construction
12L14/C1045 Steel
Maximum Operating Pressure
6000 psi
Series
6404 Series
Thread 2 Drill Dimensions
0.188 in
Thread B1 Drill Dimensions
0.062 in
Thread Size
5/16-24 x 1/8-27

Product Questions & Answers (3)

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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.

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