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Steel Adapter, 1/2-20 Male NPT To 7/16-20 Female SAE O-Ring Boss (Straight Thread O-Ring), Straight

A 1.39	Alternate Part Numbers Alternate Part Number C1BX32, Alternate Part Number MI-02157826, Alternate Part Number MINO-00028F01806	Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 6404-05-04	Thread 1 1/2-20	Thread 2 7/16-20	Thread Sealant No	Product Weight 0.10 lbs

Product Questions & Answers 3

Product Questions & Answers

trying to replace a fitting i pulled off a line, is this the one that goes from 1/2-20 male NPT over to a 7/16-20 female ORB?

Question by: Lance M on Sep 6, 2025, 10:33 AM

Match the threads and you are in the right ballpark. This adapter is a straight steel piece with a 1/2-20 Male NPT on one end and a 7/16-20 Female SAE O-Ring Boss (straight thread O-ring) on the other.

Answer by: Customer Support on Sep 8, 2025, 6:15 AM

Got a line running 1/2-20 NPT fittings and need to tie into a 7/16-20 SAE O-Ring Boss port. this adapter do that job?

Question by: Larry T on Mar 15, 2026, 7:00 PM

That's what it's built for. One end is 1/2-20 Male NPT and the other is 7/16-20 Female SAE O-Ring Boss, so it bridges those two thread standards in a single straight fitting. The O-Ring Boss end uses a straight thread with an O-ring seal, which keeps the connection tight and cuts down on leak points compared to a tapered thread alone. Made by Brennan Industries out of steel, so it holds up well in demanding conditions.

Answer by: Customer Support on Mar 17, 2026, 6:32 AM

Will this here adapter work to hook up a 1/2 NPT to a 7/16 SAE O-ring?

Question by: Terry C on Dec 17, 2025, 9:53 PM

This adapter is designed to provide a direct connection between a 1/2-20 Male NPT and a 7/16-20 Female SAE O-Ring Boss.

Answer by: Customer Support on Dec 19, 2025, 4:45 PM

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Model Number	Thread 1	Thread 2	A
2246-4-6S	1/4-18	9/16-18	1.36
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6404-04-04	1/4-18	7/16-20	1.32
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2246-16-16S	1-11-1/2	1-5/16-12	1.91
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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
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