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Steel Adapter, 3/8-18 Female NPT To 5/16-24 Male JIC 37 deg Flare, Straight

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Description & Features

Manufactured by Brennan Industries Inc, this high-quality steel adapter offers reliable connection between a 3/8-18 female NPT and a 5/16-24 male JIC 37deg; flare. Engineered for durability and precision, it ensures leak-proof performance in industrial applications.

This adapter is ideal for connecting tubes with an outer diameter of 0.13 inches. It features a straight design providing a secure and straightforward fit. The product aligns with the catalog number C1BF70 and includes a meticulously crafted threading that maintains a high level of integrity under various conditions.

The absence of thread sealant indicates its suitability for high-pressure environments where precision and reliability are paramount. The robust steel construction of this adapter ensures longevity and optimal functionality.

MPN: 2405-06-02

Supplier Part Number: 2405-06-02

Specifications

a Dimensions
1.18 in
Connection Size 1
3/8 in
Connection Size 2
1/8 in
Connection Type
FNPT, Male JIC
Connection Type 1
Male SAE 37 deg JIC Flare
Connection Type 2
Female NPTF
Dimension Standards
SAE J514/J476
Dimensions
1.19 in L
Finish
Trivalent Zinc-Plated
Fitting Type
Adapter
Hex Size
5/8 in
Material
Steel
Material Construction
AISI 12L14/C1045 Steel
Maximum Operating Pressure
6000 psi
Series
2405 Series
Thread Sealant
Without Thread Sealant
Thread Size
9/16-18 x 1/8-27

Product Questions & Answers (2)

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Question by: Daryl R on Nov 12, 2025, 9:28 PM
Will this fitting work for hooking up a hydraulic line to something with a 3/8-18 female NPT port? Just want to make sure before I order.
Answer by: Customer Support on Nov 14, 2025, 3:46 PM
This steel adapter is indeed designed to connect a 3/8-18 female NPT to a 5/16-24 male JIC 37-degree flare, so it should fit your described application.
Question by: Cindy H on Feb 7, 2026, 4:12 PM
got a 3/8 female NPT port on a small hydraulic block and need to run a JIC line off it, this the right adapter for that?
Answer by: Customer Support on Feb 9, 2026, 7:42 AM
For a 3/8-18 female NPT port feeding into a 5/16-24 male JIC 37 degree flare connection, yeah, that's exactly what this part bridges. The male JIC end is sized for tube with a 0.13 inch outer diameter, so as long as your JIC line matches up on that end, you're good. Steel construction and no thread sealant required on the JIC side, so it's built to hold up in higher-pressure hydraulic setups without any extra prep work on that flare end.

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