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

Description & Features

This high-quality steel adapter facilitates efficient connection between 3/8-18 female NPT and 7/16-20 male SAE O-Ring Boss fittings. Engineered by Brennan Industries Inc it ensures a reliable and leak-free fit for industrial applications.

Designed for optimal performance the adapter features precision threading. It offers a straightforward solution for adapting Female NPT to Male ORB configurations without requiring thread sealant.

With its robust construction the steel adapter is suitable for various demanding environments providing durability and long-lasting service.

MPN: 6405-04-06-O

Supplier Part Number: 6405-04-06-O

Specifications

A 1.21	Alternate Part Numbers Alternate Part Number 2216-6-4S, Alternate Part Number 6405-04-06, Alternate Part Number A2216-6-4S, Alternate Part Number C1BX42, Alternate Part Number MI-00314823, Alternate Part Number MINO-00028F63109	Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 6405-04-06-O	Thread 1 3/8-18	Thread 2 7/16-20	Thread Sealant No	Product Weight 0.13 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 (2)

Question by: Sherry C on Jan 12, 2026, 9:53 AM

got a fitting that's 3/8-18 NPT on the port side and need to step over to a 7/16-20 ORB male connection, this the right piece for that?

Answer by: Customer Support on Jan 14, 2026, 6:17 AM

That's what this adapter is built for. One end is 3/8-18 female NPT and the other is 7/16-20 male SAE O-Ring Boss, straight configuration. No reducers or extra fittings needed in between.

Question by: Kirk C on Oct 16, 2025, 7:23 AM

Will this fitting work to adapt a 3/8 NPT female to a 7/16 SAE O-ring boss?

Answer by: Customer Support on Oct 18, 2025, 6:52 AM

That's exactly what this adapter is for. It provides a reliable connection between those two thread types.