The SST "Identibolt" is a one-stop-shop to verify nuts and bolts. This product distinguishes between similar inch and metric threads
METRIC THREAD SIZES: -M4 x 0.7 -M5 x 0.8 -M6 x 1.0 -M7 x 1.0 -M8 x 1.0 -M8 x 1.25 -M10 x 1.0 -M10 x 1.25 -M10 x 1.5 -M12 x 1.25 -M12 x 1.5 -M12 x 1.75 -M14 x 1.5 -M14 x 2.0
IMPERIAL THREAD SIZES: -#6 – 32 Fine -#8 – 32 Fine -#10 – 24 Coarse -#10 – 32 Fine -1/4 – 20 Coarse -1/4 – 28 Fine -5/16 – 18 Coarse -5/16 – 24 Fine -3/8 – 16 Coarse -3/8 – 24 Fine -7/16 – 14 Coarse -7/16 – 20 Fine -1/2 - 13 Coarse -1/2 – 20 Fine