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Steel Adapter, 9/16-18 Male SAE O-Ring Face Seal To 1/4-18 Male NPT, Straight

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Description & Features

Part of the Eaton Aeroquip FF2031T Series, this Steel Adapter, 9/16-18 Male SAE O-Ring Face Seal To 1/4-18 Male NPT, Straight provides a reliable straight-configuration connection between SAE O-Ring Face Seal and Male NPT threaded lines. The steel construction makes it well suited for demanding service environments, including marine and military applications, chemical processing, pulp and paper facilities, food and beverage processing, and offshore drilling.

The SAE O-Ring Face Seal end delivers leak-resistant sealing performance, while the Male NPT end accommodates standard tapered thread connections. With an overall length (A dimension) of 1.24 inches, this compact adapter fits within tight installation envelopes. The catalog reference number for this part is C1CU98.

SKU: FF2031T0404S

Supplier Part Number (MPN): FF2031T0404S

Alternate Part Numbers: C1CU98, MI-00306441, MINO-00015F55519

Specifications

A
1.24
Alternate Part Numbers
Alternate Part Number C1CU98, Alternate Part Number MI-00306441, Alternate Part Number MINO-00015F55519
Application
Marine/Military, Chemical Processing, Pulp and Paper Industries, Food and Beverage Processing, Off-Shore Drilling
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
0.56
End Size 2
0.25
End Type 1
ORS
End Type 2
NPTF
Minimum Working Temperature
-40
Seal Part if Included
FF9446-11
Supplier Part Number
FF2031T0404S
Thread 1
9/16-18
Thread 2
1/4-18
Thread Sealant
No
Tube I.D. 1
0.17
Tube I.D. 2
0.28
Tube O.D.
0.25
Tube O.D.
0.25
Product Weight
1.00 lbs

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Product Questions & Answers (4)

Question by: Pete D on Jan 30, 2026, 7:43 AM
I need an adapter to go from an O-ring face seal to a pipe thread. Will this do the trick?
Answer by: Customer Support on Jan 31, 2026, 5:38 PM
This straight adapter is designed to connect a 9/16-18 male SAE O-Ring Face Seal to a 1/4-18 male NPT.
Question by: Janice F on Aug 10, 2025, 7:26 AM
Trying to hook an ORFS line to a 1/4 NPT port, is this the straight adapter for that?
Answer by: Customer Support on Aug 11, 2025, 8:36 AM
For joining those two thread styles, it matches up a 9/16-18 male SAE O-ring face seal end to a 1/4-18 male NPTF end in a straight body.
Question by: Ralph L on Jan 25, 2026, 3:38 PM
got a hose end with a 9/16-18 ORFS male on it and i need to go into a 1/4-18 npt port. is FF2031T0404S the right straight adapter?
Answer by: Customer Support on Jan 26, 2026, 5:19 PM
Match-up wise, that is exactly what this adapter is: a straight steel fitting with a 9/16-18 male SAE O-Ring Face Seal on one end and a 1/4-18 male NPT on the other.
Question by: Harvey S on Dec 31, 2025, 10:24 AM
Got a line running to a pressure gauge on a food processing skid, does this adapter work for that kind of setup?
Answer by: Customer Support on Jan 1, 2026, 11:43 AM
Food and beverage processing is actually one of the listed applications for this adapter, so yes, it fits right into that kind of use. The 9/16-18 male SAE O-Ring Face Seal end gives you a leak-resistant seal without relying on thread deformation, which matters on instrumentation lines where you want a clean, repeatable connection. The other end is 1/4-18 male NPT, which is the standard thread you'll find on most gauge ports and sensor fittings. Steel construction holds up fine in typical processing environments.