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Steel Adapter, 1/4-18 Male NPT To 3/8-18 Female NPT, Straight

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Description & Features

Built to meet the rigorous demands of industrial applications, the Steel Adapter is designed for secure connectivity within grease, instrumentation, and most hydraulic systems. Featuring a 1/4-18 Male NPT to 3/8-18 Female NPT configuration, this straight adapter ensures reliable performance and compatibility with a range of hydraulic components. Manufactured by Eaton Aeroquip, a trusted name in the industry, this adapter is crafted from high-quality steel to provide durability and long service life.

With an overall length of 1.44 inches, this adapter is compact yet robust, making it an ideal choice for environments where space is at a premium. Its precision engineering ensures a tight, leak-free seal, maintaining efficiency and safety in your hydraulic systems. This adapter is part of the Danfoss/Eaton 2040 Series, known for its quality and reliability in challenging conditions.

SKU: 2040-4-6S

Supplier Part Number (MPN): 2040-4-6S

Alternate Part Numbers: C1AY33, MI-00327457, MINO-00015F68452

Specifications

A
1.44
Alternate Part Numbers
Alternate Part Number C1AY33, Alternate Part Number MI-00327457, Alternate Part Number MINO-00015F68452
Application
Other - Grease, instrumentation, and most hydraulic systems
Brand
Danfoss Power Solutions (II LLC Aeroquip)
Brand
Aeroquip
Pack Size
1.00
UOM
EA
End Gender 1
13554
End Gender 2
13555
End Size 1
0.25
End Size 2
0.38
End Type 1
NPTF
End Type 2
NPTF
Minimum Working Temperature
-40
Supplier Part Number
2040-4-6S
Thread 1
1/4-18
Thread 2
3/8-18
Thread Sealant
No
Product Weight
0.06 lbs

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Product Questions & Answers (2)

Question by: Hubert S on Oct 21, 2025, 4:37 PM
Will this adapter work alright for hooking up some instrumentation lines?
Answer by: Customer Support on Oct 22, 2025, 4:54 PM
This Eaton Aeroquip adapter is suitable for instrumentation systems, as well as grease and most hydraulic applications.
Question by: Billy F on Feb 4, 2026, 2:20 PM
i got a 1/4 npt male coming off a line and need to adapt it to a 3/8 npt female port, is this the right piece?
Answer by: Customer Support on Feb 6, 2026, 6:41 AM
Function-wise, yes. This adapter is a straight steel fitting with 1/4-18 male NPT on one side and 3/8-18 female NPT on the other, so it steps a 1/4 NPT male connection into a 3/8 NPT female thread.