caster bolt thread size

[mjn]

Wanting to use 4 bolts with rubber heads (instead of casters) to lift my #3 a bit from my table. Brought a caster to Home Depot but a 1/2 inch stainless nut seemed a bit too tight. Figured a 1/2 inch (diameter)stainless bolt would work, perhaps would be a bit loose. However, back home the bolt seats a short distance then gets too tight to finger thread into the legs. Are these standard threads? What size? Thanks in advance.

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[old sarge]

A good hardware store like ACE or TrueValue should have a pitch gauge on hand to measure the thread as well as the diameter for SAE and Metric.  Not sure about the big box stores.

[mjn]

Good advice. Found the size for anyone looking in the future: M12-1.75 threads. Wasn't expecting metric but makers were likely limited by available casters. All set now with bolts sitting in rubber footers. Thanks.

[SuperDave]

Since Cookshacks are the only ones I hear specifically "made in America", I was expecting a metric answer.