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Brass Adapter, 1/8-27 Male NPT Square Head Plug

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Description & Features

The Brass Adapter, 1/8-27 Male NPT Square Head Plug, is a highly versatile component designed for critical applications in grease, refrigeration, instrumentation, and hydraulic systems. Manufactured by Danfoss Power Solutions (Aeroquip Inc-Alternate), it ensures reliable performance even in demanding environments. Engineered for compatibility with 1/8-27 male NPT threads, this square head plug offers easy installation and secure sealing. Suitable for various industrial applications, including fuel, LP, and natural gas (available on special order), it withstands temperatures as low as -65 degrees. This component features a PTF SAE short end type, providing a robust and durable connection. The absence of thread sealant allows for flexibility in choice of sealing methods according to specific requirements.

Supplier Part Number: 3151X2

Specifications

Connection Size 1
1/8 in
Connection Type
MNPT
Connection Type 1
MNPTF
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
1/8-27

Product Questions & Answers (3)

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Question by: Dale B on Oct 19, 2025, 7:51 PM
got a port that’s 1/8-27 npt. is this the right square head plug for it?
Answer by: Customer Support on Oct 21, 2025, 12:01 PM
For a 1/8-27 male NPT plug, the key match is the 1/8-27 thread, and that is what this part is. It is a square head plug with a male 1/8-27 end.
Question by: Wade C on Jul 15, 2025, 9:46 AM
Will this plug work for natural gas lines, or is it just for hydraulic stuff?
Answer by: Customer Support on Jul 16, 2025, 3:36 PM
It can be used for fuel, LP, and natural gas applications, but those are available as a special order item. Otherwise, it's good for grease, refrigeration, instrumentation, and hydraulic systems.
Question by: Brenda A on Nov 13, 2025, 8:18 PM
Got a grease fitting port on a hydraulic manifold I need to cap off. This the right plug for that kind of job?
Answer by: Customer Support on Nov 15, 2025, 4:23 PM
Capping off a grease port is exactly the kind of application this plug handles. It runs a 1/8-27 male NPT thread, so as long as your port is a standard 1/8-27 female NPT, it'll seat right in there. No thread sealant comes pre-applied, so you'll want to add your own tape or compound based on what the system calls for.

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