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Brass Adapter, 3/8-18 Male NPT Square Head Plug

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Description & Features

The pipe to pipe brass adapter is engineered for seamless integration in grease, refrigeration, instrumentation, and hydraulic systems. This robust component, manufactured by Danfoss Power Solutions, ensures reliable performance in a range of industrial applications.

The male 3/8-18 NPT thread provides a secure fit, minimizing the risk of leakage. Designed with a versatile square head plug, it facilitates ease of installation and removal.

With a minimum working temperature of -65 degrees, this adapter is suitable for demanding environments. The product is adaptable to fuel, LP, and natural gas systems upon special order. Its PTF SAE short end type further enhances its compatibility with various fittings.

The DANFOSS POWER SOLUTIONS (Aeroquip Inc-Alternate) brass male NPT square plug 3151X6 offers dependable and consistent performance for all your critical operations.

Supplier Part Number: 3151X6

Specifications

Brand
Aeroquip® by Danfoss
Connection Size 1
3/8 in
Connection Type
MNPT
Connection Type 1
MNPTF
Dimensions
0.82 in L
Finish
Nickel-Plated
Fitting Type
Plug
For Use With
Brass, Bronze and Iron Pipes
Material
Brass
Material Construction
Brass
Series
3151X Series
Thread Sealant
Without Thread Sealant
Thread Size
3/8-18

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Product Questions & Answers (2)

Question by: Sherry C on Sep 25, 2025, 11:49 AM
Trying to cap off a 3/8-18 port, would this square head plug be the right thread for it?
Answer by: Customer Support on Sep 27, 2025, 10:52 AM
For a 3/8-18 threaded port, this plug matches that thread size and it is a male end, so it’s meant to screw into a female 3/8-18 port to close it off.
Question by: Earl R on Nov 26, 2025, 1:38 PM
got a port i need to cap off, is this plug the right thread for 3/8 npt?
Answer by: Customer Support on Nov 28, 2025, 6:54 AM
For a 3/8-18 male NPT connection, this part matches that thread and is meant to plug or cap a port. It is a square head plug, so you have a solid grip point for install and removal.

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