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Steel Adapter, 1-1/4-11-1/2 Female NPT To 1-7/8-12 Male SAE O-Ring Boss (Straight Thread O-Ring), Straight

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Description & Features

Manufactured by Brennan Industries Inc, this high-quality steel adapter ensures reliable connectivity in industrial settings. The adapter features a 1-1/4-11-1/2 Female NPT thread on one end, seamlessly transitioning to a 1-7/8-12 Male SAE O-Ring Boss (Straight Thread O-Ring) on the other. This rigid adapter is specifically designed for effective and secure fitting in hydraulic systems.

Constructed from durable steel, it offers exceptional resistance to wear and corrosion, ensuring long-lasting functionality. This adapter does not require thread sealant, further simplifying the installation process. Suitable for use in various heavy-duty applications, it supports the efficient transfer of fluids and maintains optimal pressure levels.

Supplier Part Number: 6405-24-20-O

Specifications

a Dimensions
2.12 in
Connection Size 1
1-1/2 in
Connection Size 2
1-1/4 in
Connection Type
FNPT, Male SAE ORB
Connection Type 1
Male SAE ORB
Connection Type 2
FNPTF
Dimension Standards
SAE J1926, SAE J476
Dimensions
2.12 in L
Finish
Trivalent Zinc-Plated
Fitting Type
Adapter
Hex Size
2-1/8 in
Material
Steel
Material Construction
12L14/C1045 Steel
Maximum Operating Pressure
2500 psi
Operating Temperature
-40 to 250 deg F
Series
6405-O Series
Thread Sealant
Without Thread Sealant
Thread Size
1-1/4-11-1/2, 1-7/8-12

Product Questions & Answers (3)

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Question by: Shane A on Dec 27, 2025, 8:37 AM
got a 1-1/4 female NPT port on a manifold block and need to tie into a straight thread O-ring fitting, this the right adapter for that?
Answer by: Customer Support on Dec 29, 2025, 6:00 AM
That's exactly the crossover this adapter handles. One end is 1-1/4-11-1/2 female NPT, which threads onto your pipe or manifold port, and the other end is a 1-7/8-12 male SAE O-Ring Boss. The ORB end uses a straight thread with an O-ring to seal against the port face, which keeps things leak-free on that side without relying on thread taper. It's a straight configuration, so no angle or offset to account for during installation.
Question by: Hubert A on Mar 7, 2026, 1:46 PM
Will this adapter hold up okay in a hydraulic system running around 2000 PSI?
Answer by: Customer Support on Mar 8, 2026, 2:27 PM
Crafted from durable steel, this adapter is designed to withstand the pressure levels typically encountered in hydraulic systems, supporting efficient fluid transfer while maintaining optimal pressure.
Question by: Debbie W on Jun 15, 2025, 6:46 AM
does this adapter need any thread sealant when you put it on, or does the o-ring handle all that?
Answer by: Customer Support on Jun 16, 2025, 12:06 PM
The o-ring on the SAE O-Ring Boss end takes care of the seal, and no thread sealant is required on this adapter. That simplifies installation quite a bit since you're not dealing with tape or paste on either end. Just make sure the o-ring seats properly and you're good to go.

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