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Steel Adapter, 1/4-18 Male NPT To 9/16-18 Female JIC 37 deg Flare Swivel, 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 9/16-18 Female JIC 37-degree flare swivel, making it well-suited for hydraulic systems that require a reliable transition between NPT and JIC fittings. The swivel end allows for easier line positioning and assembly without twisting the connected hose or tube.

The Steel Adapter, 1/4-18 Male NPT To 9/16-18 Female JIC 37 deg Flare Swivel, Straight is part of the Eaton Aeroquip 2018 Series and carries catalog number C1AU66. It is designed for demanding service environments including marine and military, chemical processing, pulp and paper, food and beverage processing, and offshore drilling applications.

SKU: 2018-4-6S

Supplier Part Number (MPN): 2018-4-6S

Alternate Part Numbers: C1AU66, MI-00305325, MINO-00015F54244

Specifications

Connection Size 1
3/8 in
Connection Size 2
1/4 in
Connection Type
Female JIC Swivel, MNPT
Connection Type 1
Female SAE 37 deg JIC Flare Swivel
Connection Type 2
Male NPTF
Dimension Standards
SAE J514
Dimensions
1.59 in L
Finish
Dura-Kote™
Fitting Type
Adapter
Hex Size
11/16 in
Material
Steel
Material Construction
Carbon Steel
Operating Temperature
-40
Series
2018 Series
Thread Size
1/4-18 x 9/16-18
Tube OD
3/8 in

Product Questions & Answers (3)

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Question by: Keith B on Aug 29, 2025, 10:05 AM
got a hose end that’s 9/16-18 JIC, what does the other side of this adapter screw into?
Answer by: Customer Support on Aug 30, 2025, 8:41 PM
On the pipe side, it’s a 1/4-18 male NPTF thread. The other end is a 9/16-18 female JIC 37 degree flare swivel, so it mates to a JIC 37 degree male flare.
Question by: Brett S on Jun 28, 2025, 3:29 PM
what industries is this adapter actually rated for? we run a paper mill and need something that holds up
Answer by: Customer Support on Jun 30, 2025, 6:05 AM
Marine, military, chemical processing, pulp and paper, food and beverage, and offshore drilling are all listed applications for this fitting. Pulp and paper specifically is called out, so it lines up with what you're running. The Eaton Aeroquip 2018 series has a solid track record in those kinds of wet, corrosive process environments.
Question by: Marvin C on Jul 10, 2025, 9:45 PM
Will this adapter work okay in a marine environment?
Answer by: Customer Support on Jul 12, 2025, 12:01 PM
Given its listed applications including marine environments, this adapter should be suitable for such use.

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