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Steel Adapter, 3/8-18 Male NPT To 9/16-18 Female SAE O-Ring Boss (Straight Thread O-Ring), Straight

A 1.39	Alternate Part Numbers Alternate Part Number 2246-6-6S, Alternate Part Number A2246-6-6S, Alternate Part Number C1BX34, Alternate Part Number MI-00319357, Alternate Part Number MINO-00028F65419	Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 6404-06-06	Thread 1 3/8-18	Thread 2 9/16-18	Thread Sealant No	Product Weight 0.12 lbs

Product Questions & Answers 2

Product Questions & Answers

Just want to be sure, this fits a standard 3/8 NPT pipe, right?

Question by: Randy G on Jun 7, 2025, 2:29 PM

Yes sir, this adapter features a 3/8-18 Male NPT connection, so it will fit a standard 3/8 NPT pipe.

Answer by: Customer Support on Jun 8, 2025, 2:36 PM

Got a hydraulic line running 3/8 NPT male on one end and need to tie into a 9/16-18 ORB female port. This adapter gonna handle that straight shot connection?

Question by: Daryl M on Sep 2, 2025, 12:23 PM

Yeah, that's exactly what this one's built for. The male end threads in at 3/8-18 NPT and the female side accepts a 9/16-18 SAE O-Ring Boss fitting, straight configuration, no angle. Steel construction keeps it solid under the kind of stress you'd expect in a working hydraulic system.

Answer by: Customer Support on Sep 3, 2025, 5:35 PM

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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