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Size Up Bolts With Check-A-Thread
When you need to identify a bolt size and thread, the Ortus Enterprises Check-A-Thread gauges may be a good addition to your shop.
The plastic and metal thread checkers make it easy to figure out the correct diameters for metric and inch bolts as well as thread size from extra fine to fine to coarse.
Simply screw in the bolts or nuts to find the right size. The 15 metric sizes are mounted in red plastic, and the 21 standard measure sizes are on blue plastic. Measure the length of bolts with the rulers on the top of each 5 by 24-in. unit.
Made in the U.S., Check-A-Thread gets pretty good reviews, though some report that the plastic base can warp. Handy DIYers figure out ways to mount them on boards, shelves, and other places in their shops. The pair sells for $86 on Amazon.

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2023 - Volume #47, Issue #4