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

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Description & Features

This Eaton Aeroquip steel adapter connects two 3/8-18 NPT components in a straight line. Well-suited for use in grease, instrumentation, and most hydraulic systems, it ensures a reliable connection.

This straight adapter features a durable steel construction to withstand demanding conditions. Its design provides a secure and leak-free seal in a variety of hydraulic applications.

SKU: 2040-6-6S

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

Alternate Part Numbers: C1AY35

Specifications

A
1.44
Alternate Part Numbers
Alternate Part Number C1AY35
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
0.38
End Size 2
0.38
End Type 1
NPTF
End Type 2
NPTF
Minimum Working Temperature
-65
Supplier Part Number
2040-6-6S
Thread 1
3/8-18
Thread 2
3/8-18
Thread Sealant
No
Tube I.D. 1
0.41
Product Weight
0.13 lbs

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Product Questions & Answers (2)

Question by: Glen M on Nov 2, 2025, 6:47 PM
Will this adapter work with regular pipe fittings, or does it have to be NPTF?
Answer by: Customer Support on Nov 4, 2025, 6:53 AM
This is an NPTF (National Pipe Taper Fuel) adapter, so it's designed to seal without tape or sealant, especially in fuel or hydraulic applications. Regular NPT (National Pipe Taper) threads might not seal as reliably without some extra help.
Question by: Judy B on Mar 9, 2026, 11:37 AM
got a 3/8-18 npt port on a manifold. is this the straight adapter that goes male on one side and female on the other?
Answer by: Customer Support on Mar 11, 2026, 11:17 AM
For a straight NPT connection, this adapter is 3/8-18 male NPT on one end and 3/8-18 female NPT on the other, so it matches a 3/8-18 NPT male-to-female setup.