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Steel Adapter, 3/8-18 Male NPT To 7/16-20 Female SAE O-Ring Boss (Straight Thread O-Ring), Straight

A 1.13	Alternate Part Numbers Alternate Part Number A2246-6-4S, Alternate Part Number C1BX31, Alternate Part Number MI-02144119, Alternate Part Number MINO-00028J33611	Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 6404-04-06	Thread 1 3/8-18	Thread 2 7/16-20	Thread Sealant No	Product Weight 0.08 lbs

Product Questions & Answers 3

Product Questions & Answers

trying to hook a 3/8-18 npt port up to an ORB line, is this the right adapter?

Question by: Ricky C on Nov 6, 2025, 3:53 PM

For that mix of threads, it matches what you described. One side is 3/8-18 male NPT, and the other side is 7/16-20 female SAE O-Ring Boss, straight thread.

Answer by: Customer Support on Nov 8, 2025, 6:33 AM

got a hydraulic line running NPT fittings and need to tie into a port that's SAE O-ring boss, will this adapter bridge that gap without needing any thread tape or sealant?

Question by: Duane R on Dec 10, 2025, 12:58 PM

That's what this one's built for. The male end threads in as 3/8-18 NPT, and the female side accepts 7/16-20 SAE O-Ring Boss straight thread. The ORB end gets its seal from the O-ring itself, so no tape or thread sealant is needed on that side. Just make sure your NPT end is sealed properly, since tapered pipe threads typically do benefit from some sealant or tape on the male threads.

Answer by: Customer Support on Dec 12, 2025, 10:54 AM

So this adapter, it's steel right? Just making sure it can handle what I'm throwin' at it.

Question by: Duane A on Jul 12, 2025, 9:17 AM

it's made from high-quality steel, so it's built to be durable for industrial use.

Answer by: Customer Support on Jul 14, 2025, 7:34 AM

Similar Products

Model Number	Thread 1	Thread 2	A
2246-4-6S	1/4-18	9/16-18	1.36
2246-6-8S	3/8-18	3/4-16	1.45
6404-04-04	1/4-18	7/16-20	1.32
2246-12-12S	3/4-14	1-1/16-12	1.92
2246-16-16S	1-11-1/2	1-5/16-12	1.91
2246-2-4S	1/8-27	7/16-20	1.09
2246-8-10S	1/2-14	7/8-14	1.78
6404-04-06	3/8-18	7/16-20	1.13
6404-05-04	1/2-20	7/16-20	1.39
6404-06-06	3/8-18	9/16-18	1.39
6404-08-08	1/2-14	3/4-16	1.7