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Steel Adapter, 1/4-18 Male NPT To 1/8-27 Male NPT, Straight

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Description & Features

Manufactured by Eaton Aeroquip, this straight steel adapter connects a 1/4-18 male NPT thread to a 1/8-27 male NPT thread, making it a practical solution for reducing or transitioning between common pipe thread sizes in a single inline fitting. The Steel Adapter, 1/4-18 Male NPT To 1/8-27 Male NPT, Straight carries catalog number C1BA71 and has an overall length (A dimension) of 1.26 inches.

Suited for grease, instrumentation, and most hydraulic systems, this fitting is compatible with a broad range of fluid types. The NPTF thread form on both ends provides a pressure-tight mechanical seal without the need for additional sealing compounds, though compatibility with system fluids should be verified using Eaton's published fluid compatibility documentation.

SKU: 2083-4-2S

Supplier Part Number (MPN): 2083-4-2S

Alternate Part Numbers: C1BA71, MI-00327134, MINO-00015F68301

Specifications

A
1.26
Alternate Part Numbers
Alternate Part Number C1BA71, Alternate Part Number MI-00327134, Alternate Part Number MINO-00015F68301
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
13556
End Size 1
0.25
End Size 2
0.13
End Type 1
NPTF
End Type 2
NPTF
Minimum Working Temperature
-65
Supplier Part Number
2083-4-2S
Thread 1
1/4-18
Thread 2
1/8-27
Thread Sealant
No
Product Weight
0.06 lbs

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Product Questions & Answers (3)

Question by: Gene M on Feb 26, 2026, 11:27 AM
got a gauge with 1/8-27 npt on it, but the port i’m tying into is 1/4-18. is this the right straight adapter to marry those up?
Answer by: Customer Support on Feb 27, 2026, 7:58 PM
For stepping between those two pipe sizes, it’s a straight steel pipe-to-pipe adapter with 1/4-18 male NPTF on one end and 1/8-27 male NPTF on the other, so it matches the thread callouts you listed.
Question by: Johnny T on May 31, 2025, 7:41 AM
got a grease line coming off a small pump with a 1/8 inch male fitting and i need to step it up to a 1/4 inch male NPT port on the manifold, this the right piece for that?
Answer by: Customer Support on Jun 1, 2025, 8:14 PM
That's what this adapter is built for. It's an all-steel straight adapter with a 1/4-18 male NPT on one end and a 1/8-27 male NPT on the other, so it bridges those two thread sizes without any elbows or extra fittings in between. Grease systems are one of the listed applications, so you're in good shape there.
Question by: Kurt M on Nov 14, 2025, 6:33 PM
Will this adapter work alright for hooking up some grease lines to a smaller port?
Answer by: Customer Support on Nov 16, 2025, 5:16 PM
This Eaton Aeroquip adapter is suitable for grease applications, as well as instrumentation and most hydraulic systems. Just make sure the thread sizes match your needs, it goes from 1/4-18 male NPT to 1/8-27 male NPT.