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Steel Adapter, 3/8-18 Male NPT To 1/4-18 Female NPT, Straight

A 1.44	Alternate Part Numbers Alternate Part Number 2040-6-4S, Alternate Part Number C1DX65, Alternate Part Number MI-01363215, Alternate Part Number MINO-00028F69448	Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 5405-06-04	Thread 1 3/8-18	Thread 2 1/4-18	Thread Sealant No	Product Weight 0.12 lbs

Product Questions & Answers 1

Product Questions & Answers

Got a line running 3/8 NPT male and need to tie into a 1/4 female port. this adapter gonna work for that?

Question by: Kent G on Nov 19, 2025, 8:10 PM

That's what this piece is built for. One end is 3/8-18 male NPT and the other is 1/4-18 female NPT, so you're threading the male end into your 3/8 line and accepting a 1/4 male fitting on the other side. Steel construction holds up well in tough conditions, and you won't need any thread sealant to make the connection.

Answer by: Customer Support on Nov 21, 2025, 6:04 AM

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Model Number	Thread 1	Thread 2	A
2040-2-4S	1/8-27	1/4-18	1.21
2040-4-8S	1/4-18	1/2-14	1.68
2040-12-12S	3/4-14	3/4-14	1.93
2040-12-16S	3/4-14	1-11-1/2	2.18
2040-16-16S	1-11-1/2	1-11-1/2	2.37
2040-16-20S	1-11-1/2	1-1/4-11-1/2	2.46
2040-2-2S	1/8-27	1/8-27	1.04
2040-4-4S	1/4-18	1/4-18	1.39
2040-4-6S	1/4-18	3/8-18	1.44
2040-6-6S	3/8-18	3/8-18	1.44
2040-6-8S	3/8-18	1/2-14	1.68
2040-8-12S	1/2-14	3/4-14	1.93
2040-8-8S	1/2-14	1/2-14	1.87
5405-06-04	3/8-18	1/4-18	1.44
5405-08-06	1/2-14	3/8-18	1.85
5405-08-16	1/2-14	1-11-1/2	2.18
5405-12-06	3/4-14	3/8-18	1.63
5405-12-08	3/4-14	1/2-14	1.94
5405-16-12	1-11-1/2	3/4-14	2.12