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Steel Adapter, 7/16-20 Male JIC 37 deg Flare Hex Plug

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Description & Features

Manufactured from steel and conforming to SAE 37° flare standards, this fitting is designed for use in hydraulic, instrumentation, and chemical processing systems where a reliable male JIC hex plug connection is required. The Steel Adapter, 7/16-20 Male JIC 37 Deg Flare Hex Plug carries a 7/16-20 thread specification with a 0.25-inch tube O.D. and is rated for a minimum working temperature of -40°F, making it suitable for demanding thermal conditions. Supplied by Danfoss Power Solutions (Aeroquip), it is cataloged under number C1CB21 and classified under UNSPSC code 40183100. No thread sealant is required for this fitting.

SKU: 900599-4S

Supplier Part Number (MPN): 900599-4S

Alternate Part Numbers: 20011204, C1CB21, MI-00317217, MINO-00015F64571

Specifications

A
0.80
Alternate Part Numbers
Alternate Part Number 20011204, Alternate Part Number C1CB21, Alternate Part Number MI-00317217, Alternate Part Number MINO-00015F64571
Application
Other - Hydraulic, instrumentation, and chemical processing systems
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
0.44
End Type 1
SAE 37
End Type 2
SAE 37
Minimum Working Temperature
-40
Supplier Part Number
900599-4S
Thread 2
7/16-20
Thread Sealant
No
Tube O.D.
0.25
Tube O.D.
0.25
Product Weight
0.01 lbs

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Product Questions & Answers (4)

Question by: Wayne F on Nov 11, 2025, 5:28 PM
Will this plug work for instrumentation systems, or is it mainly for hydraulics?
Answer by: Customer Support on Nov 13, 2025, 10:29 AM
This steel adapter is applicable to hydraulic, instrumentation, and chemical processing systems.
Question by: Daryl S on Jan 15, 2026, 2:55 PM
got a 1/4 inch tube line, is this the right plug for a 37 degree JIC flare port?
Answer by: Customer Support on Jan 17, 2026, 6:49 AM
For a 1/4 inch tube size JIC 37 degree flare connection, this plug matches that setup. It’s a steel 37 degree flare hex plug with 7/16-20 thread and a 0.25 inch tube O.D. callout, so the sizing lines up for that common 1/4 tube JIC flare.
Question by: Phil B on Oct 29, 2025, 2:01 PM
what exactly does this plug do in a hydraulic line, like is it just blocking off a port or something more to it?
Answer by: Customer Support on Oct 30, 2025, 2:35 PM
Blocking off an unused JIC port is exactly what this fitting handles. The 37 degree flare seating surface creates a metal-to-metal seal when torqued down, so fluid can't push past it even under working pressure. You'd use it anywhere you need to cap a live hydraulic circuit, close off an instrumentation tap that isn't in use, or seal a port during testing or reconfiguration. The male JIC thread is 7/16-20, which is the standard for -4 JIC fittings in most hydraulic and instrumentation hydraulic connections.
Question by: Kent B on Nov 3, 2025, 4:15 PM
got a port with 7/16-20 JIC on it, is this the right plug to cap it off?
Answer by: Customer Support on Nov 5, 2025, 10:40 AM
For capping a 7/16-20 male JIC 37 degree flare connection, this part matches that thread and flare style. It is a straight 37 degree flare hex plug in the Eaton Aeroquip 900599 series.