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Steel Adapter, 1/4-18 Male NPT Countersunk Hex Plug

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Description & Features

Engineered for precision and durability, this 1/4-18 Male NPT Countersunk Hex Plug from Eaton Aeroquip is an essential component for grease, instrumentation, and various hydraulic systems. Crafted from high-quality steel, this adapter ensures a secure and reliable connection, effectively preventing leaks and maintaining system efficiency. Its compact design, with dimensions of A: 0.46 and B: 0.25, facilitates easy integration into existing setups.

Renowned for their robust performance, Eaton Aeroquip products are ideal for demanding industrial applications, ensuring exceptional longevity and safety. The hex plug design allows for straightforward installation and removal, minimizing downtime during maintenance. This component is part of the Danfoss / Eaton 2222 Series, known for their compatibility and reliability in high-pressure environments.

SKU: 2222-4S

Supplier Part Number (MPN): 2222-4S

Alternate Part Numbers: C1BC89, MI-00298910, MINO-00015F47341

Specifications

A
0.46
Alternate Part Numbers
Alternate Part Number C1BC89, Alternate Part Number MI-00298910, Alternate Part Number MINO-00015F47341
Application
Other - Grease, instrumentation, and most hydraulic systems
B
0.25
Brand
Danfoss Power Solutions (II LLC Aeroquip)
Brand
Aeroquip
Pack Size
1.00
UOM
EA
End Gender 1
13554
End Size 1
0.25
End Size 2
0.25
End Type 1
NPTF
Minimum Working Temperature
-40
Supplier Part Number
2222-4S
Thread 1
1/4-18
Thread Sealant
No
Product Weight
0.02 lbs

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Product Questions & Answers (2)

Question by: Hubert J on Jan 21, 2026, 2:05 PM
trying to plug a 1/4-18 npt port, is this the right kind of plug or is it some weird thread
Answer by: Customer Support on Jan 23, 2026, 7:11 AM
Built for a 1/4-18 male NPT pipe/plug connection, this is a countersunk hex plug style adapter in Eaton Aeroquip’s 2222 series with NPTF external pipe/plug threads.
Question by: Clint D on May 10, 2025, 5:22 PM
what all can this plug be used for, grease fittings and such or just hydraulics?
Answer by: Customer Support on May 12, 2025, 8:58 AM
Grease systems, instrumentation lines, and most standard hydraulic systems are all fair game for this plug. It's part of Eaton Aeroquip's 2222 Series and uses NPTF external pipe thread, so it seals well across a pretty wide range of fluid handling applications. Not just straight hydraulics by any means.