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

Description & Features

The Steel Adapter, 1/4-18 Male NPT To 7/16-20 Female SAE O-Ring Boss (Straight Thread O-Ring), Straight, by Brennan Industries Inc, offers reliable connection solutions within industrial projects.

This adapter features a 1/4-18 male NPT thread and a 7/16-20 female SAE O-Ring Boss (ORB) thread, making it ideally suited for various industrial applications requiring robust, leak-free connections.

Constructed from durable steel, it ensures longevity and sustained performance under demanding conditions. The straight thread design facilitates precise alignment and secure fitting, ensuring optimal functionality.

Catalog Number: C1BX30

MPN: 6404-04-04

Supplier Part Number: 6404-04-04

Specifications

A 1.32	Alternate Part Numbers Alternate Part Number 2246-4-4S, Alternate Part Number A2246-4-4S, Alternate Part Number C1BX30	Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 6404-04-04	Thread 1 1/4-18	Thread 2 7/16-20	Thread Sealant No	Product Weight 0.06 lbs

Similar Products

Model Number	Thread 1	Thread 2	A
2246-4-6S Male NPT To Female ORB Adapter	1/4-18	9/16-18	1.36
2246-6-8S Male NPT To Female ORB Adapter	3/8-18	3/4-16	1.45
6404-04-04 Male NPT To Female ORB Adapter	1/4-18	7/16-20	1.32
2246-12-12S Male NPT To Female ORB Adapter	3/4-14	1-1/16-12	1.92
2246-16-16S Male NPT To Female ORB Adapter	1-11-1/2	1-5/16-12	1.91
2246-2-4S Male NPT To Female ORB Adapter	1/8-27	7/16-20	1.09
2246-8-10S Male NPT To Female ORB Adapter	1/2-14	7/8-14	1.78
6404-04-06 Male NPT To Female ORB Adapter	3/8-18	7/16-20	1.13
6404-05-04 Male NPT To Female ORB Adapter	1/2-20	7/16-20	1.39
6404-06-06 Male NPT To Female ORB Adapter	3/8-18	9/16-18	1.39
6404-08-08 Male NPT To Female ORB Adapter	1/2-14	3/4-16	1.7

Product Questions & Answers (5)

Question by: Travis H on Mar 6, 2026, 7:16 PM

got a 1/4 NPT male port on a hydraulic block and need to tie into a -4 SAE O-ring female fitting. this the right adapter for that?

Answer by: Customer Support on Mar 8, 2026, 5:22 PM

That's what this one's built for. One end is 1/4-18 male NPT, which threads into your NPT port on the block. The other end is 7/16-20 female SAE O-ring Boss, which is your standard -4 ORB straight thread connection. Both thread sizes line up with what you described, so you're good to go.

Question by: Chad R on Oct 3, 2025, 6:24 PM

got a hose end that’s 7/16-20 ORB female. is this the piece that’ll let me tie into a 1/4-18 NPT port?

Answer by: Customer Support on Oct 5, 2025, 11:53 AM

It bridges those two thread types in one straight steel adapter. One side is 1/4-18 male NPT and the other side is 7/16-20 female SAE O-Ring Boss (straight thread O-ring), which is commonly called a #4 FORB x #4 MP.

Question by: Jimmy M on Aug 1, 2025, 1:26 PM

Will this adapter work to connect a 1/4 NPT male fitting to a 7/16 SAE O-ring boss?

Answer by: Customer Support on Aug 2, 2025, 4:53 PM

That's exactly what this adapter is for; it allows you to connect a 1/4-18 male NPT to a 7/16-20 female SAE O-Ring Boss (Straight Thread O-Ring).

Question by: Dwight B on Dec 8, 2025, 4:58 PM

got a line running 1/4 NPT male and need to tie into a port that takes an ORB fitting, will this adapter make that connection work?

Answer by: Customer Support on Dec 9, 2025, 8:43 PM

That's exactly what this piece is built for. One end is a 1/4-18 male NPT thread, the other is a 7/16-20 female SAE O-Ring Boss. So if your line terminates in a 1/4 NPT male and your port accepts a 7/16-20 ORB male, this adapter bridges that gap straight through with no angle or offset.

Question by: Travis W on Dec 6, 2025, 10:06 AM

trying to hook up a 1/4 npt line to an ORB port, is this the right adapter?

Answer by: Customer Support on Dec 7, 2025, 5:23 PM

For that hookup, it’s a straight steel adapter with a 1/4-18 male NPT on one side and a 7/16-20 female SAE O-Ring Boss (ORB) straight thread on the other, so it’s meant to bridge NPT to a #4 ORB connection.