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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

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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 Dimensions
1.32 in
Connection Size 1
1/4 in
Connection Size 2
1/4 in
Connection Type
Female SAE ORB, MNPT
Connection Type 1
Female SAE ORB
Connection Type 2
MNPTF
Dimension Standards
SAE J1926, SAE J476
Dimensions
1.3 in L
Finish
Trivalent Zinc-Plated
Fitting Type
Adapter
Hex Size
11/16 in
Material
Steel
Material Construction
12L14/C1045 Steel
Maximum Operating Pressure
6000 psi
Series
6404 Series
Thread Sealant
Without Thread Sealant
Thread Size
7/16-20, 1/4-18

Product Questions & Answers (5)

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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.

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