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Steel Adapter, 1/4-18 Female NPT To 7/16-20 Male SAE O-Ring Boss (Straight Thread O-Ring), Straight

Description & Features

The Steel Adapter 1/4-18 Female NPT To 7/16-20 Male SAE O-Ring Boss (Straight Thread O-Ring) Straight by Brennan Industries Inc is a reliable component designed for industrial applications requiring secure connections. Crafted from durable steel this adapter ensures long-lasting performance and strength.

Ideal for systems utilizing rigid connections it features a 1/4-18 Female NPT thread and a 7/16-20 Male SAE O-Ring Boss connection. This configuration is perfect for maintaining a tight seal in high-pressure environments without the need for thread sealant.

With capabilities to handle various industrial fluids and gases this adapter meets high standards of quality and reliability. Its straightforward design simplifies installation and maintenance ensuring efficiency in demanding settings.

MPN: 6405-04-04-O

Supplier Part Number: 6405-04-04-O

Specifications

A 1.16	Alternate Part Numbers Alternate Part Number 2104-2216-4-4, Alternate Part Number 30799, Alternate Part Number 6405-04-04, Alternate Part Number A2216-4-4S, Alternate Part Number C1BX41, Alternate Part Number MI-00316632, Alternate Part Number MINO-00028F64296	Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 6405-04-04-O	Thread 1 1/4-18	Thread 2 7/16-20	Thread Sealant No	Product Weight 0.08 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 (1)

Question by: Billy B on Sep 29, 2025, 10:03 AM

got a port on my hydraulic block that's NPT female and I need to tie into a SAE O-ring boss line, this the right piece for that?

Answer by: Customer Support on Oct 1, 2025, 8:19 AM

For a 1/4-18 female NPT port connecting to a 7/16-20 male SAE O-ring boss fitting, yeah, that's exactly what this adapter is built for. The NPT end threads into your block and the ORB end gives you a metal-to-metal seal with the O-ring, so you're not relying on tape or thread sealant to hold pressure. Steel construction means it'll hold up in typical industrial hydraulic setups without issues.