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Brass Adapter, 0.25 Inch Female 42 deg Inverted Flare To 1/4-18 Male NPT, Straight

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Description & Features

This brass adapter is designed to facilitate connection between a 0.25 Inch Female 42-degree Inverted Flare and a 1/4-18 Male NPT. Manufactured by Danfoss Power Solutions this component ensures reliable and secure fittings for various industrial applications.

Constructed from durable brass it provides resistance to corrosion and is suitable for use in hydraulic brake systems power steering fuel lines and transmission cooler lines. The adapter is also compatible with LP and natural gas applications when specially ordered.

With a thread size of 1/4-18 it features a straight design that ensures straightforward installation and maintenance. Its operational temperature range extends to a minimum of -40 degrees ensuring optimal performance in demanding environments.

The end sizes are 0.25 inches and 0.4375 inches for NPTF and UNF connections respectively. This product is classified under ECCN: EAR99 and falls within the UNSPSC category 40183100.

MPN: C1HD39

Supplier Part Number: 202X4X4

Specifications

Alternate Part Numbers
Alternate Part Number C1HD39, Alternate Part Number FMC601194, Alternate Part Number MI-00333371, Alternate Part Number MINO-00925F73125
Application
Other - Hydraulic brake, power steering, fuel lines and transmission cooler lines, LP and natural gas (special order)
Brand
Danfoss Power Solutions (II LLC Aeroquip)
Brand
Aeroquip
Pack Size
1.00
UOM
EA
End Gender 1
13554
End Gender 2
13555
End Size 1
0.25
End Size 2
0.44
End Type 1
NPTF
End Type 2
UNF
L
0.89
Minimum Working Temperature
-40
Supplier Part Number
202X4X4
Thread 1
1/4-18
Thread Sealant
No
Tube O.D.
0.25
Tube O.D.
0.25
Product Weight
0.10 lbs

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Product Questions & Answers (2)

Question by: Keith P on Mar 15, 2026, 10:39 AM
Been trying to sort out if this fitting'll work on a transmission cooler line setup. Does the 42-degree inverted flare end mate up right for that kind of application?
Answer by: Customer Support on Mar 17, 2026, 8:22 AM
Transmission cooler lines are one of the listed applications for this adapter, so yeah, it fits right in with that kind of work. The 0.25 inch female 42-degree inverted flare end connects on one side, and the 1/4-18 male NPT threads in on the other. Brass construction holds up well to the fluid exposure and temperature swings that cooler line setups tend to see, and the straight configuration keeps the install pretty clean without needing to fight any angle.
Question by: Lyle S on Mar 31, 2025, 1:54 PM
Will this adapter work for hooking up the fuel line on my old Ford pickup?
Answer by: Customer Support on Apr 2, 2025, 12:29 PM
This brass adapter can be used in fuel lines, along with hydraulic brake systems, power steering, and transmission cooler lines. Just make sure the thread sizes match up with your truck; it's designed for a 0.25 Inch Female 42-degree Inverted Flare to a 1/4-18 Male NPT connection.