Availability Of Locking Coupler Pin With 5/16" Diameter

Updated 02/03/2026 | Published 07/25/2024

Products Featured in This Question

etrailer Trailer Coupler Latch Lock - 2" Span - 1/4" Diameter - Chrome

(261)

$19.78

Trimax Universal Trailer Coupler Lock for 1-7/8", 2", and 2-5/16" Couplers

(106)

$74.83

Question:

Hello, I have an aluma 8214HS TILT trailer that has a 2” coupler with a 5/16” hole for a coupler pin. I am having a hard time finding a theft deterrent/safety coupler pin that has a lock on it for this 5/16th size of a hole. Do you guys carry any lockable coupler pins that are this size? Thanks in advance!

asked by: Davis M

Expert Reply:

Hello Davis. The 1/4" pins are the standard for most coupler locks, and unfortunately, we do not offer anything with a 5/16" diameter. A 1/4" pin such as part # e98886, can still be used, but there may be a bit more play than you would like.

Another good option for theft deterrent is a universal coupler lock like the Trimax Universal Trailer Coupler Lock # TMX47FR. This will work with the 2" ball and will fit a wide variety of coupler styles up to 4-1/2" wide overall.

expert reply by: Jesse M

Jesse M.

2/3/2026

Hey Davis, how did the Trimax universal coupler lock work out on your Aluma trailer? Your feedback could really help others looking for a theft deterrent for a similar setup.