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Wrench & Socket Sizes For Different Diameter Bolts

open end wrench

Figure 1 - Open end wrench


Figure 2 - Socket

Knowing what size wrench or socket to use on a bolt can save hours of time and frustration. The following chart is applicable for hex, square and lag bolts.

a chart of wrench and socket sizes

The chart is applicable 99% of the time for open end, box end, 6 and 12 point sockets.

In some cases a manufacturer may adjust the head size of a bolt in order to have the head fit into a certain location.