Thread Identifier

Check Internal and External Threads Easily and Precisely​

Fed up of struggling to identify bolt and nut threadforms? You need to buy our thread finder! The Thread Detective is a precise and easy-to-use thread identifier for both bolts and nuts, consisting of thread checkers conveniently assembled onto a wire lanyard. It is especially well suited for distinguishing between similar inch and metric thread types.
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Identify thread types of Metric and Imperial Fasteners Quickly and Easily

The Combo Thread Detective has the following checking sizes:

UNC and UNF: 6-32, 8-32, 10-24, 10-32, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, 1/2-13, & 1/2-20,

Metric: M4x0.7, M5x0.8, M6x1.0, M8x1.0, M8x1.25, M10x1.0, M10x1.25, M10x1.50, M12x1.25, M12x1.5, & M12x1.75.