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Brass Adapter, 1/4-18 Male NPT To 1/4-18 Male NPT, Straight Hex Nipple

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Description & Features

Designed for demanding applications, the Brass Adapter facilitates optimal connections for grease, refrigeration, instrumentation, and hydraulic systems. Featuring male NPTF threads on both ends, it ensures a secure and reliable connection. The straight hex nipple design enhances ease of installation and maintenance.

With a working temperature range down to -65deg;F, this adapter is suitable for various industrial settings. The end sizes and threads are standardized at 1/4-18, ensuring compatibility with numerous systems. Although fuel, LP, and natural gas applications are available on special order, flexibility is a hallmark of this brass adapter.

Crafted by Danfoss Power Solutions, the adapter underscores reliability and performance. It offers a robust solution for connecting components within specified systems, meeting industry standards without the need for thread sealant. This versatile adapter exemplifies quality in every aspect of its construction.

Supplier Part Number: 3325X4

ECCN: EAR99

Specifications

Connection Size 1
1/4 in
Connection Size 2
1/4 in
Connection Type
MNPT
Connection Type 1
Male NPTF
Connection Type 2
Male NPTF
Dimension Standards
SAE 130137
Fitting Type
Nipple
For Use With
Brass, Bronze and Iron Pipes
Hex Size
0.563 in
I Dimensions
1.38 in
Material
Brass
Material Construction
CA360 Brass
Segment Code
A
Series
3325 Series
Thread Size
1/4-18
Threaded Sealant
Without Thread Sealant

Product Questions & Answers (3)

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Question by: Jimmy C on Apr 10, 2025, 11:54 AM
got a valve with 1/4-18 female npt ports on both sides. is this the right little nipple to tie em together?
Answer by: Customer Support on Apr 12, 2025, 7:37 AM
For tying two 1/4-18 female pipe ports together, you want a straight hex nipple with 1/4-18 male NPTF threads on both ends. This adapter is exactly that, male 1/4-18 NPTF to male 1/4-18 NPTF.
Question by: Ross B on May 19, 2025, 5:26 PM
Does this nipple need any thread sealant when you're putting it in, or does it seal up on its own?
Answer by: Customer Support on May 21, 2025, 1:43 PM
NPTF threads are built to seal through thread-on-thread contact alone, so no sealant is required. The male NPTF ends on both sides of this adapter create a mechanical seal as they're tightened into the mating ports. That said, make sure both the adapter and the receiving fittings are clean and free of debris before you torque it down.
Question by: Patty R on Oct 21, 2025, 6:05 AM
Will this fitting hold up alright for connecting some hydraulic lines on my tractor?
Answer by: Customer Support on Oct 22, 2025, 9:26 AM
For hydraulic systems, this brass adapter should work just fine. It's designed to handle demanding applications within those types of systems.

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