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Bolts, nuts, washers and rivets. We use 1/4x20 bolts for the most part but also keep #10 and #8 around. Get various lengths I 1/4" increments. Make sure you have nylocks and washers. We also use 3/16" rivets.

Also, all those pesky wago connectors you need for the control system

We also keep plenty of shaft collars, 3/8, 1/2" around. Velcro is also handy to have, we stock 1" wide Velcro. Machine key stock is on hand as we'll, 8mm, 1/8"