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Threaded & Adapters Reducing Adapter, 1/4-18 FNPT x 1/8-27 MNPT, 316 SS

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Description & Features

This reducing adapter features a 1/4-18 FNPT to 1/8-27 MNPT connection, ideal for adapting dissimilar thread sizes in instrumentation and control systems. Constructed from 316 stainless steel, the Threaded & Adapters Reducing Adapter offers excellent corrosion resistance and durability in demanding industrial environments.

The adapter ensures a secure and leak-free connection. It is suitable for use with various fluids and gases, providing a reliable solution for pressure and flow control applications.

SKU: RA-1/4X1/8

Supplier Part Number (MPN): 1/4X1/8RA

Alternate Part Numbers: C1DJ68, MI-08751889, MINO-00766X32113

Specifications

Alternate Part Numbers
Alternate Part Number 1/4X1/8RA, Alternate Part Number C1DJ68, Alternate Part Number MI-08751889, Alternate Part Number MINO-00766X32113
Brand
Ssp Fittings Corp
Brand
SSP Fittings Corp
Pack Size
1.00
UOM
EA
Supplier Part Number
1/4X1/8RA
Product Weight
0.99 lbs

Product Questions & Answers (2)

Question by: Randy S on Aug 6, 2025, 8:03 PM
got a 1/4-18 female NPT port but the gauge line is 1/8-27 male NPT. is this the little adapter i need?
Answer by: Customer Support on Aug 8, 2025, 6:48 AM
For that kind of size change, this adapter is made to go from 1/4-18 FNPT on one side to 1/8-27 MNPT on the other, so it fits the job of stepping a 1/4 female NPT connection down to a 1/8 male NPT connection.
Question by: Wayne L on Mar 28, 2026, 8:18 AM
Got a 1/4 female port on my instrument panel and need to step it down to 1/8 male, this the right piece for that?
Answer by: Customer Support on Mar 29, 2026, 1:32 PM
That's what this adapter is built for. The female end threads in at 1/4-18 NPT and the male end comes out at 1/8-27 NPT, so you're going from the larger port down to the smaller connection. Standard tapered NPT threads on both ends, which means you get a tight, leak-free seal without a lot of fuss during installation.