Lock for Demco Cast Head Coupler And Safety Chains
Updated 06/28/2026 | Published 06/23/2026
Products Featured in This Question
Question:
I purchased this Demco Cast Head Coupler w/ Jack Hole - eZ-Latch - 2 Ball - A-Frame - Bolt-On - 10K. Do you have a lock that covers it and the chains?
asked by: Kathy B
Expert Reply:
Hi Kathy; we do have locks like the InfiniteRule Lock for Cast Demco eZ-Latch Trailer Couplers # IR66FR or ICON # AL78DQ for your # DM37ZR. However, there are no locks that cover both the coupler and safety chains. If you're wanting to leave them on the trailer while it is sitting/stored, I would wrap the chains around the tongue and secure them with a simple padlock like # ML1KA.
What kind of trailer do you have?
(click to enlarge)
Dave
6/28/2026
The Infinite Rule lock works pretty well, but two minor observations 1) the 1/4 inch pin could be larger diameter, and 2) key chains with multiple keys make it cumbersome to use, a single key is easier to operate. A quarter or half turn tumbler lock would be better than a full multi-turn thread.
Matt
6/28/2026
I bought this lock for my Demco cast hitch as nothing I had “on the shelf” would work. I could not be happier or more satisfied with the quality and the functionality of this lock. Yes, I would unabashedly recommend this lock. And, while I’m at it, I would be remiss if I didn’t give eTrailer a duff of my hat, as well. I don’t “shop it around” anymore- eTrailer has become my go to for anything I need with regard to my trailer. Hope this helps.
Cliff
6/28/2026
Hi Kathy, I agree with Dave about the key. I have a key for the Infinite Rule lock attached to my tow vehicle key and it is some what difficult to turn and turn the Infinite Rule lock. I us the other single key that came with the Infinite Rule lock and it is less frustrating to turn. Other than that it's a very good lock and the lock fits the Demco Cast Head Coupler very will.
Product Page this Question was Asked From
InfiniteRule Lock for Cast Demco eZ-Latch Trailer Couplers - 2" and 2-5/16"
- Trailer Tongue Lock
- Latch Lock
- Universal Application Lock
- Keyed Unique
- Stainless Steel
- Fits 2 Inch Ball
- Fits 2-5/16 Inch Ball
- 2-15/16 Inch Span
- InfiniteRule
more information >
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on Trailer Tongue Lock
Robert B.
6/28/2026
I bought one. It works great!