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Brass Adapter, 1/4-18 Male NPT To 0.31 Inch Female 42 deg Inverted Flare, 90 deg Elbow

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Description & Features

The Brass Adapter 1/4-18 Male NPT To 0.31 Inch Female 42 deg Inverted Flare 90 deg Elbow is designed for efficient and reliable connections in hydraulic brake power steering fuel lines transmission cooler lines and LP and natural gas systems. The male NPT connection ensures robust threading while the inverted flare provides a secure seal.

Engineered to function in temperatures as low as -65 degrees this adapter is a dependable component for cold environments. The 0.8700 drop dimension allows for seamless integration into existing setups minimizing installation time and improving overall system compatibility.

This durable brass adapter offered under the Danfoss Power Solutions brand is a high-quality part for a variety of industrial applications. It features a 1/4-18 NPT male end and a 0.31-inch female 42-degree inverted flare connection making it suitable for precise and secure connections.

MPN: 402X5X4

Supplier Part Number: 402X5X4

Specifications

Brand
Aeroquip® by Danfoss
Connection Size 1
5/16 in
Connection Size 2
1/4 in
Connection Type
Female SAE Inverted Flared, MNPT
Connection Type 1
Male NPTF
Connection Type 2
Female SAE Inverted Flared
Dimension Standards
SAE 040202
Dimensions
1.16 in L x 0.59 in W x 0.75 in H
Drop Dimensions
0.87 in
Fitting Type
90 deg Elbow
For Use With
Aluminum, Brass, Copper and Steel Hydraulic Tubings
l Dimensions
0.45 in
Material
Brass
Material Construction
Brass
Operating Temperature
-65 to 250 deg F
Series
402X Series
Thread Size
1/2-20

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Product Questions & Answers (2)

Question by: Billy T on Sep 26, 2025, 6:33 AM
What all can this brass elbow adapter be used for? Got a few different lines on a piece of equipment and trying to figure out if one part covers my needs.
Answer by: Customer Support on Sep 28, 2025, 8:45 AM
Quite a few applications, actually. It's rated for hydraulic brake lines, power steering lines, fuel lines, transmission cooler lines, and LP and natural gas systems. If you're dealing with more than one of those on the same machine, there's a solid chance this adapter covers more than one of your connections. Just make sure the thread and flare sizes line up on your end before ordering.
Question by: Lyle W on Feb 27, 2026, 3:35 PM
trying to hook a 1/4-18 npt port to an inverted flare line, is that what this elbow is for?
Answer by: Customer Support on Mar 1, 2026, 6:50 AM
For tying those two styles together, it’s a 90 degree brass adapter with a 1/4-18 male NPT on one end and a 0.31 inch female 42 degree inverted flare on the other, so you can transition from an NPT port to an inverted flare connection.

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