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Steel Adapter, 3/8-18 Male NPT To 7/16-20 Male JIC 37 deg Flare, Straight

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Description & Features

Optimize your hydraulic system with the Eaton Aeroquip Steel Adapter, designed to connect 3/8-18 Male NPT to 7/16-20 Male JIC 37-degree flare fittings. Crafted from durable steel, this straight adapter ensures reliable performance in demanding environments such as marine, military, chemical processing, pulp and paper, food and beverage processing, and off-shore drilling. Its robust construction provides long-lasting durability, making it an essential component for a variety of industrial applications.

The adapter is part of the Danfoss/Eaton 2021 Series, known for precision and consistent quality. The combination of NPT and JIC connections offers versatility in installation, ensuring a secure fit and leak-free operation. This product is well-suited for use in high-pressure hydraulic systems where dependability is critical.

SKU: 2021-6-4S

Supplier Part Number (MPN): 2021-6-4S

Alternate Part Numbers: 20011342, C1AV21, MI-00310061, MINO-00015F60056

Specifications

A
1.42
Alternate Part Numbers
Alternate Part Number 20011342, Alternate Part Number C1AV21, Alternate Part Number MI-00310061, Alternate Part Number MINO-00015F60056, Alternate Part Number MINO-00925X08736
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
13556
End Size 1
0.38
End Size 2
0.44
End Type 1
NPTF
End Type 2
SAE 37
Minimum Working Temperature
-40
Supplier Part Number
2021-6-4S
Thread 1
3/8-18
Thread 2
7/16-20
Thread Sealant
No
Tube O.D.
0.25
Tube O.D.
0.25
Product Weight
0.09 lbs

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Product Questions & Answers (2)

Question by: Bonnie C on Jan 30, 2026, 10:09 AM
got a hose end that’s 7/16-20 JIC, will this adapter screw right into a 3/8-18 pipe port on the other side?
Answer by: Customer Support on Feb 1, 2026, 6:06 AM
For connecting those two thread standards, it’s the right style. One end is 3/8-18 male NPTF pipe thread and the other end is 7/16-20 male SAE 37 degree flare (JIC), and it’s a straight steel adapter.
Question by: Billy S on Apr 21, 2025, 6:25 AM
got a 3/8-18 male NPT side on my hydraulic line that needs to tie into a 7/16-20 JIC fitting, this straight adapter the right piece for that job?
Answer by: Customer Support on Apr 23, 2025, 6:56 AM
That's what this adapter is built for. One end is 3/8-18 male NPT and the other is 7/16-20 male JIC with a 37-degree flare seat, so it bridges those two thread types in a straight inline configuration. It's part of the Eaton Aeroquip 2021 Series, which is a well-established line of steel pipe-to-flare adapters. As long as your mating fittings match those thread sizes and standards, this is the correct piece.