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What Size Lock Fits a BTBRV InstaLatch Ball Mount  

Published 10/16/2026



Question:

I'm getting the BTBRV InstaLatch Ball Mount BTBRV009 for my equipment trailer and want to lock it to my truck. Will a regular hitch lock work with the built-in pins, or do I need something different?

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Expert Reply:

Hi Trevor! A regular receiver lock won't work with the BTBRV InstaLatch Ball Mount # BTBRV009 since it uses built-in hitch pins. Instead, you need a lock with a 1/4" diameter pin that fits through the release mechanism.

I recommend the etrailer Lock # e39PR. It has the correct 1/4" pin diameter and a 2-3/4" usable span, so you can use it in place of the included wire lock pin to keep someone from releasing and removing the ball mount.

Are you planning to leave the ball mount installed when you aren't towing?

expert reply by:
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Robin H
e39PR
e39PR
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BTBRV InstaLatch
BTBRV InstaLatch
(click to enlarge)
Trevor profile picture

Trevor

10/16/2026

If I use the e39PR lock, can I still remove the ball mount without taking the lock off?

Robin H. profile picture
Etrailer Expert

Robin H.

10/16/2026

@Trevor no, you'll need to unlock and remove the # e39PR before operating the release mechanism. That's what keeps someone from walking up and removing your InstaLatch. Once the lock is out, you can operate the release and remove the ball mount without dealing with a traditional hitch pin.
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