What Size Pins Hold The Ball In Place On The etrailer Ball Mount e66PR

Updated 10/27/2025 | Published 03/11/2025

Products Featured in This Question

etrailer Adjustable 2-Ball Mount - 2" Hitch - 6" Rise, 6" Drop - 10K

(157)

$106.29

Fastway Trailer Hitch Receiver Lock - 2" Hitches - 5/8" Diameter - Qty 1

(198)

$21.21

TowSmart Hitch Receiver Locking Pin w/Cap - 1/2" and 5/8" Diameter

(18)

$16.93

Question:

What diameter lock do I need for the pins that adjust the height of the ball?

asked by: Joel C

Expert Reply:

Good question Joel.

I couldn't find that measurement anywhere so I grabbed one and measured it. This will take a lock with a 5/8" diameter and at least 2-1/4" of useable space. I added a quick, though quite crude, picture below showing what I mean.

If you didn't have a lock you were already looking at, I think the Fastway # FA86-00-3050 would be a very good option. It meets the 5/8" requirement and actually has 2-13/16" of useable space, so it will fit perfectly. There are a few less expensive options, but they use a tube to adapt it to fit the larger 5/8" hole (see part # TS24VR as an example) and I don't think you would be happy with it.

If you have any other questions or need further assistance, let me know in the comments below. And just as a side note, we don't have many pictures of this ball mount from people who have bought them, so if you wanted to snap a few and send them over, it would be greatly appreciated : )

expert reply by: Lazer S

etrailer Ball Mount Pin
(click to enlarge)

Lazer S.

10/27/2025

Hey Joel, how did the 5/8-inch lock work out with your adjustable ball mount? Your update could make it easier for the next person trying to find the right fit.