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Steel Adapter, 9/16-18 Male JIC 37 deg Flare Hex Plug

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Description & Features

Manufactured to SAE 37° flare specifications, this steel adapter is designed for use in demanding hydraulic systems across marine and military, chemical processing, pulp and paper, food and beverage, and off-shore drilling applications. The male JIC hex plug configuration allows for clean line termination where a port needs to be capped or sealed without thread sealant.

The Steel Adapter, 9/16-18 Male JIC 37 deg Flare Hex Plug is part of the Danfoss Power Solutions (Aeroquip) 900599 Series and carries catalog number C1CB23. It features a 9/16-18 thread size with a 0.375 in. tube O.D. and is rated for a minimum working temperature of -40°. The male-to-female end configuration suits straight adapter installations where a secure, leak-resistant connection is required.

UNSPSC code 40183100 classifies this fitting within fluid power connectors. This part is ECCN-rated EAR99, indicating no special export licensing is required for most destinations.

SKU: 900599-6S

Supplier Part Number (MPN): 900599-6S

Alternate Part Numbers: 20011205, C1CB23, MI-00317238, MINO-00015F64573

Specifications

A
0.84
Alternate Part Numbers
Alternate Part Number 20011205, Alternate Part Number C1CB23, Alternate Part Number MI-00317238, Alternate Part Number MINO-00015F64573
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
13555
End Size 1
0.56
End Type 1
SAE 37
End Type 2
SAE 37
Minimum Working Temperature
-40
Supplier Part Number
900599-6S
Thread 2
9/16-18
Thread Sealant
No
Tube O.D.
0.38
Tube O.D.
0.38
Product Weight
0.02 lbs

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Product Questions & Answers (4)

Question by: Floyd S on May 7, 2025, 5:03 PM
got a line with 9/16-18 JIC, is this the right plug to cap it off?
Answer by: Customer Support on May 9, 2025, 2:23 PM
For a 9/16-18 SAE 37 degree flare (JIC) connection, this is a matching steel hex plug in the Danfoss 900599 series. It is a straight 37 degree flare plug with 9/16-18 threads and is sized for 3/8 inch tube OD.
Question by: Darryl B on Dec 8, 2025, 1:59 PM
Would this plug work alright in a saltwater environment on my boat?
Answer by: Customer Support on Dec 9, 2025, 6:10 PM
These steel adapters are suited for marine applications, so it should hold up well for you.
Question by: Todd P on Sep 22, 2025, 2:47 PM
what industries is this plug rated for, or is it pretty much just general hydraulic use?
Answer by: Customer Support on Sep 24, 2025, 8:11 AM
Eaton Aeroquip built this one for some fairly demanding environments. Listed applications include marine and military use, chemical processing, pulp and paper, food and beverage processing, and offshore drilling. That covers a wide range, so it holds up well across industries where fluid compatibility and reliable sealing matter.
Question by: Terry R on Jul 25, 2025, 12:50 PM
Is this plug compatible with standard JIC fittings?
Answer by: Customer Support on Jul 26, 2025, 6:40 PM
It sure is. This adapter plug is made to fit any standard 9/16-18 male JIC 37 degree flare fitting.