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Steel Adapter, 5/16-24 Male SAE O-Ring Boss (Straight Thread O-Ring) To 7/16-20 Male JIC 37 deg Flare, Straight

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Description & Features

This steel adapter from Brennan Industries Inc is engineered to meet the specific requirements of Straight Thread O-Ring to 37deg; Flare connections. It features a robust construction conducive for high-pressure applications.

Designed for reliability, it includes a 5/16-24 male SAE O-Ring Boss on one end and a 7/16-20 male JIC 37deg; flare on the other end, enabling efficient fluid transfer. The absence of thread sealant ensures compatibility with a variety of systems.

The adapter fits tubes with an outer diameter of 0.25 inches, offering versatility in industrial applications. Its configuration promotes leak-free performance and durability under demanding conditions.

MPN: 6400-04-02-O

Supplier Part Number: 6400-04-02-O

Specifications

a Dimensions
1.13 in
Connection Size 1
1/8 in
Connection Size 2
1/4 in
Connection Type
Male JIC, Male SAE ORB
Connection Type 1
Male SAE ORB
Connection Type 2
Male SAE 37 deg JIC Flare
Dimension Standards
SAE J1926/J514
Dimensions
1.17 in L
Finish
Trivalent Zinc-Plated
Fitting Type
Adapter
Hex Size
1/2 in
Material
Steel
Material Construction
AISI 12L14/C1045 Steel
Operating Temperature
-40 to 250 deg F
Series
6400-O Series
Thread Sealant
Without Thread Sealant
Thread Size
7/16-20 x 5/16-24
Tube OD
1/4 in
Tube Outside Diameter
1/4 in

Product Questions & Answers (2)

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Question by: Lee B on Aug 20, 2025, 1:08 PM
got a 1/4 inch tube line coming off a hydraulic valve with an ORB port, will this adapter let me tie into a JIC fitting on the other end without needing extra pieces in between?
Answer by: Customer Support on Aug 22, 2025, 7:50 AM
That's exactly the job this adapter handles. One end is a 5/16-24 Male SAE O-Ring Boss, which threads directly into a straight-thread ORB port. The other end is a 7/16-20 Male JIC 37-degree flare, sized for 1/4 inch tube. So yes, you get a direct one-piece connection between those two thread types with no additional fittings required.
Question by: Dwayne C on Oct 18, 2025, 2:09 PM
Got a line running 1/4 inch OD tube that needs to tie into an SAE O-Ring Boss port, does this adapter actually cover that setup?
Answer by: Customer Support on Oct 20, 2025, 6:47 AM
That's what this one handles. One end is a 5/16-24 male SAE O-Ring Boss, which threads straight into an ORB port, and the other end is a 7/16-20 male JIC 37 degree flare, which is the standard fitting for 1/4 inch OD tubing. The overall length runs 1.13 inches, so it's a compact piece that won't take up much room in tight spots.

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