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What is the Thread Size and Pitch of the Tow Smart part # TS89ZR Mounting Bolts?  

Updated 05/18/2026 | Published 05/16/2026

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Question:

What is the thread size and pitch for the mounting bolts?

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Expert Reply:

Hi Greg,

I was able to find installation instructions for the TowSmart Trailer Hitch part # TS89ZR (2044 is the manufacturer part number) with the hardware information. The bolts are a standard hex head that are 12mm in diameter with a 1.25 pitch (1.25mm between threads). It is 30mm long, has a class 10 strength rating and a yellow zinc finish. I've linked the file with the installation instructions for you as well. The instructions also give the proper specs for torquing the bolts down, which is 86 ft-lbs for all the bolts.

Are you looking for replacement hardware for this hitch? Or installing it for the first time?

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Claire H
TowSmart Trailer Hitch part # TS89ZR
TowSmart Trailer Hitch part # TS89ZR
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