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Danfoss / Eaton ADP Bulkhead Lock Nut

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Description & Features

Constructed from carbon steel with Dura-Kote plating, this locknut delivers reliable corrosion resistance in demanding hydraulic and fluid connector assemblies. The Danfoss / Eaton ADP Bulkhead Lock Nut belongs to the 210212 Series and is engineered to secure bulkhead fittings at operating pressures above standard SAE thresholds, making it well suited for high-pressure industrial hydraulic systems.

Part of the Eaton Aeroquip line, this component is available across hundreds of fitting styles, supporting broad design flexibility in custom or complex assemblies. Carbon steel construction keeps the part durable under mechanical stress, while the corrosion-resistant finish supports service life in harsh or exposed environments.

SKU: 210212-16S

Supplier Part Number (MPN): 210212-16S

Alternate Part Numbers: C1BB82, MI-00317896, MINO-00015F64781

Specifications

Brand
Aeroquip® by Danfoss
Connection Type
Female JIC
Dimension Standards
SAE 070118/J514
Finish
Dura-Kote™
Fitting Type
Locknut
Material
Steel
Material Construction
Carbon Steel
nmfc
50
Series
210212 Series
Thread Size
1-5/16-12

Product Questions & Answers (3)

Question by: Rick P on Mar 29, 2025, 12:40 PM
what's the finish on this locknut, and will it hold up if it's gonna be sitting in a wet or real humid environment?
Answer by: Customer Support on Mar 31, 2025, 6:09 AM
Carbon steel construction with Dura-Kote plating gives this nut solid corrosion resistance, so humid or moisture-heavy conditions are well within what it's built to handle. That plating is specifically what sets it above bare steel hardware in environments where rust is a real concern.
Question by: Brent S on Apr 22, 2025, 6:13 PM
Got a 210212-16S bulkhead nut that’s seen better days, is this the right lock nut to swap in?
Answer by: Customer Support on Apr 23, 2025, 7:53 PM
For a straight replacement, this is the 210212 Series ADP bulkhead lock nut with supplier part number 210212-16S, so it matches that series and part number callout.
Question by: Stan B on Oct 12, 2025, 2:26 PM
Will this lock nut work with standard Aeroquip fittings, or is it only for Danfoss stuff?
Answer by: Customer Support on Oct 13, 2025, 3:08 PM
It's an Eaton Aeroquip part, so it's made to work with their ADP series fittings. You'll want to double-check the sizing to be sure.

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