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Steel Adapter, 1-5/8-12 Male JIC 37 deg Flare Hex Plug

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Description & Features

Manufactured from steel and built for demanding industrial service, this Steel Adapter, 1-5/8-12 Male JIC 37 Deg Flare Hex Plug is part of the Eaton Aeroquip 900599 Series. The male JIC 37-degree flare hex plug configuration provides a reliable seal in straight-connection applications, with an A dimension of 1.45 inches supporting consistent fitment across compatible hydraulic assemblies.

Suited for use across a broad range of industries, this adapter is well matched to marine and military, chemical processing, pulp and paper, food and beverage processing, and off-shore drilling environments. The hex plug design simplifies installation and removal using standard tooling, making it a practical choice for fluid systems that require periodic maintenance or reconfiguration. Catalog reference C1CB17 applies.

SKU: 900599-20S

Supplier Part Number (MPN): 900599-20S

Alternate Part Numbers: 20011209, C1CB17, MI-00317300, MINO-00015F64580

Specifications

Connection Type
Male 37 deg JIC
Dimension Standards
SAE 070109/J514
Dimensions
1.45 in L
Finish
Dura-Kote™
Fitting Type
Plug
Hex Size
1.688 in
Material
Steel
Material Construction
Carbon Steel
Operating Temperature
-40 to 250 deg F
Series
900599 Series
Thread Sealant
Without Thread Sealant
Thread Size
1-5/8-12

Product Questions & Answers (3)

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Question by: Diane G on Oct 31, 2025, 9:00 PM
i got a line with 1-5/8-12 JIC threads. is this the right plug to cap it off?
Answer by: Customer Support on Nov 2, 2025, 6:46 AM
For a 1-5/8-12 JIC 37 degree flare connection, this is a straight steel hex plug made for that SAE 37 flare style. It matches the 1-5/8-12 thread callout and is intended to close off that type of flare port.
Question by: Johnny T on Jul 3, 2025, 8:17 AM
Is this plug made to hold up in saltwater conditions, like on a boat?
Answer by: Customer Support on Jul 5, 2025, 6:55 AM
This steel adapter is suitable for marine applications, so it should hold up well in saltwater environments.
Question by: Duane W on Nov 17, 2025, 6:18 AM
what industries is this plug actually used in, like is it just for heavy equipment or does it go into other stuff too?
Answer by: Customer Support on Nov 19, 2025, 6:57 AM
Marine, military, chemical processing, pulp and paper, food and beverage, and offshore drilling all show up as listed applications for this fitting. So no, it's not just heavy equipment territory. Anywhere you need to cap off a 1-5/8-12 male JIC 37 degree flare port cleanly, this plug fits the bill across a pretty wide range of industries.

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