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Brass Adapter, 1/2-14 Male NPT Square Head Plug

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Description & Features

Designed for use in grease refrigeration instrumentation and hydraulic systems the Brass Adapter 1/2-14 Male NPT Square Head Plug ensures reliable performance under a variety of conditions. With a minimum working temperature of -65 this plug is suitable for demanding environments.

Manufactured by Danfoss Power Solutions (Aeroquip Inc-Alternate) this male NPT square head plug is available with a special order option for fuel LP and natural gas applications. The 1/2-14 thread size and PTF SAE short end type provide a secure and compatible fit for your industrial needs.

The plug's durable brass composition offers corrosion resistance making it ideal for long-term use in harsh environments. Additionally it does not include any thread sealant granting greater flexibility for use with various applications that require specific sealing methods.

Supplier Part Number: 3151X8

Specifications

Connection Size 1
1/2 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
1/2-14

Product Questions & Answers (2)

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Question by: Duane G on Sep 6, 2025, 2:59 PM
What's this plug made of? I need something that won't rust on me.
Answer by: Customer Support on Sep 8, 2025, 8:18 AM
Being made of brass, this plug offers good corrosion resistance, which is helpful for longer life in tougher environments.
Question by: Ralph O on Jan 22, 2026, 9:55 PM
Does this plug work for refrigeration lines, or is it mainly a hydraulic fitting?
Answer by: Customer Support on Jan 24, 2026, 8:59 AM
Brass construction and a minimum working temperature of -65 degrees make it a solid fit for refrigeration applications. It also handles grease, instrumentation, and hydraulic systems, so it covers a fairly wide range of uses. The 1/2-14 NPT thread with a PTF SAE short end gives you a secure connection across those environments without needing a dedicated refrigeration-specific fitting.

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