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Steel Bulkhead Locknut, 1/2-20 Thread

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Description & Features

This Danfoss / Eaton 210212 series locknut, also known as catalog number C1JC36, is a carbon steel component designed for hydraulic applications.

The Steel Bulkhead Locknut, 1/2-20 Thread, features a 1/2-20 thread and is part of the Pipe to 37° Flare Steel Adapters product model line.

It has a tube O D of 0.31 inches. This locknut is designed as a spare part.

SKU: 210212-5S

Supplier Part Number (MPN): 210212-5S

Alternate Part Numbers: C1JC36

Specifications

Brand
Aeroquip® by Danfoss
Connection Type
Female JIC
Dimension Standards
SAE 070118/J514
Finish
Dura-Kote™
Fitting Type
Locknut
Hex Size
1/4 in
Material
Steel
Material Construction
Carbon Steel
Series
210212 Series
Thread Size
1/2-20

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Product Questions & Answers (3)

Question by: Jimmy J on Jul 8, 2025, 2:10 PM
Got a bulkhead fitting that calls for a 1/2-20 locknut, is this the right nut for that?
Answer by: Customer Support on Jul 10, 2025, 10:25 AM
The key callout on this part is the 1/2-20 thread. It is a steel bulkhead locknut in the Danfoss and Eaton 210212 spare part line, so it matches applications that specify a 1/2-20 bulkhead nut.
Question by: Norm H on Jan 7, 2026, 6:30 AM
Will this nut work to hold a fitting through a panel?
Answer by: Customer Support on Jan 8, 2026, 3:07 PM
Exactly, this bulkhead nut is designed for securing fittings tightly through panels or walls, providing a solid, leak-proof connection.
Question by: Diane P on Mar 11, 2026, 3:00 PM
Is this the right locknut for a 210212 series bulkhead fitting, or do I need something different?
Answer by: Customer Support on Mar 13, 2026, 6:16 AM
For the Danfoss / Eaton 210212 series, this is the correct spare part bulkhead nut. It carries catalog number C1JC36 and comes from Eaton Aeroquip, so it matches that series directly. The thread is 1/2-20, with an A dimension of 0.25 and a B dimension of 0.75, so double-check those measurements against your fitting before ordering if you've got any doubt about which size you're working with.

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