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Steel Bulkhead Locknut, 7/16-20 Thread

A 0.25	Alternate Part Numbers Alternate Part Number C1BB83, Alternate Part Number MI-00317840, Alternate Part Number MINO-00015F64773	B 0.69	Brand Danfoss Power Solutions (II LLC Aeroquip)	Brand Aeroquip	Pack Size 1.00	UOM EA	Finish None	Materials Carbon steel	Series 210212	Supplier Part Number 210212-4S	Thread 2 7/16-20	Thread Sealant No	Tube O.D. 0.25	Tube O.D. 0.25	Type Locknut	Product Weight 0.02 lbs

Product Questions & Answers 3

Product Questions & Answers

got a bulkhead fitting that takes a 7/16-20 nut, is this the right locknut for it?

Question by: Jerry L on Feb 9, 2026, 9:47 PM

The key detail is the thread. This locknut is 7/16-20 and it’s called out as a Danfoss and Eaton 210212 Series spare part bulkhead nut, so it matches bulkhead setups that use that series and thread size.

Answer by: Customer Support on Feb 11, 2026, 7:41 AM

what thread size is this locknut, and is it the same part Eaton lists under the 210212 series?

Question by: Cindy S on Dec 19, 2025, 7:58 AM

7/16-20 is the thread size on this one. It's cataloged under the Eaton Aeroquip 210212 series as a spare part bulkhead nut, with the catalog number C1BB83. So yes, it lines up with what Eaton lists for that series.

Answer by: Customer Support on Dec 20, 2025, 9:34 AM

Just want to make sure this will fit my setup. It's a 7/16-20 thread, right?

Question by: Clint S on Dec 15, 2025, 4:50 PM

That's correct. This is a bulkhead locknut with a 7/16-20 thread size, fitting standard Danfoss / Eaton 210212 Series applications.

Answer by: Customer Support on Dec 16, 2025, 4:57 PM

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Model Number	Tube O.D.	Thread 2	A	B
210212-5S	0.31	1/2-20	0.25	0.75
210212-6S	0.38	9/16-18	0.27	0.81
210212-8S	0.5	3/4-16	0.31	1
0306-32	2	2-1/2 - 12	0.22	0.63
210212-10S	0.63	7/8-14	0.36	1.12
210212-12S	0.75	1-1/16 - 12	0.41	1.38
210212-4S	0.25	7/16-20	0.25	0.69