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#1 Simplest way is to buy a bolt gauge from a hardware store or online.

Example:

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=39240&xcamp=Google&utm_source=googlebase&utm_medium=cpc&zmam=33951326&zmas=12&zmac=112&zmap=39240

#2 Next method is to see if you or someone you know ever purchased an assortment of nuts and bolts from a hardware store that has labeled drawers. Take nut from the labeled drawer and match it up.

#3 You can make your own bolt gauge if you own a set of drill bits. Drill holes in sheet metal or wood and label the holes. Push the bolt in the holes till you find a fit. This will not give you the thread pitch though which you usually need for a mating nut.

#4 If you have a set of wrenches that are the size of the bolt threads match them up until you find a fit. You probably do not have wrenches that small though. I assume it is a small bolt.

#5 Use calipers to gauge the diameter and place the gauge reading on an accurate ruler. This will not give you the thread pitch either.

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15y ago

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