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Steel Adapter, 9/16-18 Male SAE O-Ring Face Seal To 3/8-18 Male NPT, Straight

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Description & Features

This steel adapter is a straight adapter from the Danfoss / Eaton FF2031T series. It adapts from 9/16-18 male SAE O-ring face seal to 3/8-18 male NPT connections. Suitable for applications such as marine/military, chemical processing, pulp and paper industries, food and beverage processing, and off-shore drilling. Minimum working temperature: -40 degrees.

Thread 1 is 9/16-18 and thread 2 is 3/8-18. Tube I.D. 1: 0.17. Tube I.D. 2: 0.41. Tube O.D.: 0.25. Seal part, if included: FF9446-11.

SKU: FF2031T0406S

Supplier Part Number (MPN): FF2031T0406S

Alternate Part Numbers: C1JA70, MI-02056508, MINO-00015J90454

Specifications

Brand
Aeroquip® by Danfoss
Connection Size 1
1/4 in
Connection Size 2
3/8 in
Connection Type
Male ORFS, MNPT
Connection Type 1
Male ORFS
Connection Type 2
Male NPTF
Dimension Standards
SAE 520102/J1453
Dimensions
1.24 in L
Finish
Dura-Kote™
Fitting Type
Adapter
Hex Size
3/4 in
Material
Steel
Material Construction
Carbon Steel
Operating Temperature
-40 to 250 deg F
Seal Material
NBR
Series
FF2031T Series
Thread Size
3/8-18, 9/16-18
Tube OD
1/4 in

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Product Questions & Answers (2)

Question by: Wayne S on Oct 11, 2025, 12:12 PM
trying to hook up a 9/16-18 ORFS line to a 3/8-18 NPT port, is that what this adapter does
Answer by: Customer Support on Oct 12, 2025, 8:23 PM
Function-wise, it bridges those two connection types in a straight body. One end is 9/16-18 male SAE O-ring face seal, and the other end is 3/8-18 male NPT, so it is meant for exactly that ORFS-to-NPT hookup.
Question by: Chad O on May 5, 2025, 7:33 AM
Got a line running NPT on one end and an SAE O-ring face seal on the other, does this fitting bridge those two without needing extra pieces in between?
Answer by: Customer Support on May 6, 2025, 5:31 PM
That's what it handles. One end is a 9/16-18 male SAE O-ring face seal and the other is a 3/8-18 male NPT, all in one straight body. No additional adapters or couplings needed to go between those two thread types.

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