What Tool Should be Used to Tighten Spindle Nuts

Updated 11/17/2025 | Published 12/28/2024

Question:

What size socket fits spindle nut 6-191?

asked by: Ken L

Expert Reply:

Hey Ken, that's a good question but it's actually best to just use a set of channel locks when tightening the spindle nut # 6-191 because you aren't actually supposed to get it very tight. Basically you torque it down nut on the spindle should be tightened until snug, with no side-to-side play in the hub and then backed off slightly, about maybe a 1/8 of a turn. If the spindle uses a castle nut and cotter pin or tang nut, tighten the nut finger tight until it stops, then back it off so the cotter pin or washer tang fits into the next indentation of the castle nut.

If you click on the video link I provided, and forward to the 1:40 mark, you can see one of our techs demonstrating how to tighten a spindle nut.

expert reply by: Jameson C

Jameson C.

11/17/2025

Hey Ken, how did things go using the channel locks to snug up that spindle nut? Your results could really help others trying to get the right feel for that adjustment.