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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

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 2.12	Alternate Part Numbers Alternate Part Number 6405-24-20, Alternate Part Number A2216-20-24S, Alternate Part Number C1BX63	Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 6405-24-20-O	Thread 1 1-1/4-11-1/2	Thread 2 1-7/8-12	Thread Sealant No	Product Weight 1.17 lbs

Similar Products

Model Number	Thread 1	Thread 2	A
2216-12-12S Female NPT To Male ORB Adapter	3/4-14	1-1/16-12	1.67
2216-16-16S Female NPT To Male ORB Adapter	1-11-1/2	1-5/16-12	1.91
2216-2-4S Female NPT To Male ORB Adapter	1/8-27	7/16-20	0.92
2216-8-8S Female NPT To Male ORB Adapter	1/2-14	3/4-16	1.65
6405-24-20-O Female NPT To Male ORB Adapter	1-1/4-11-1/2	1-7/8-12	2.12
2216-12-16S Female NPT To Male ORB Adapter	3/4-14	1-5/16-12	1
2216-16-20S Female NPT To Male ORB Adapter	1-11-1/2	1-5/8-12	1
2216-20-20S Female NPT To Male ORB Adapter	1-1/4-11-1/2	1-5/8-12	2
2216-24-24S Female NPT To Male ORB Adapter	1-1/2-11-1/2	1-7/8-12	2
2216-4-5S Female NPT To Male ORB Adapter	1/4-18	1/2-20	1.2
2216-4-6S Female NPT To Male ORB Adapter	1/4-18	9/16-18	1.24
2216-6-12S Female NPT To Male ORB Adapter	3/8-18	1-1/16-12	1.34
2216-6-8S Female NPT To Male ORB Adapter	3/8-18	3/4-16	1.25
2216-8-10S Female NPT To Male ORB Adapter	1/2-14	7/8-14	1.54
2216-8-12S Female NPT To Male ORB Adapter	1/2-14	1-1/16-12	1.72
6405-04-04-O Female NPT To Male ORB Adapter	1/4-18	7/16-20	1.16
6405-04-06-O Female NPT To Male ORB Adapter	3/8-18	7/16-20	1.21
6405-05-02-O Female NPT To Male ORB Adapter	1/8-27	1/2-20	0.94
6405-06-06-O Female NPT To Male ORB Adapter	3/8-18	9/16-18	1.16
6405-06-08-O Female NPT To Male ORB Adapter	1/2-14	9/16-18	1.4
6405-08-04-O Female NPT To Male ORB Adapter	1/4-18	3/4-16	1.16
6405-10-04-O Female NPT To Male ORB Adapter	1/4-18	7/8-14	0.81
6405-10-06-O Female NPT To Male ORB Adapter	3/8-18	7/8-14	1.55
6405-12-16-O Female NPT To Male ORB Adapter	1-11-1/2	1-1/16-12	1.91
6405-16-08-O Female NPT To Male ORB Adapter	1/2-14	1-5/16-12	1.61
6405-20-12-O Female NPT To Male ORB Adapter	3/4-14	1-5/8-12	1.19
6405-24-16-O Female NPT To Male ORB Adapter	1-11-1/2	1-7/8-12	1

Product Questions & Answers (3)

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.