                                      ### DECIMAL SIZE vs. NOMINAL DIAMETER SIZE

To determine the proper nominal diameter size of a screw, you will need a caliper. Some calipers have LED read-outs in decimals. The\se decimal numbers will need to be converted into a whole number to determine what the diameter of the machine screw is. Check the chart below for easy decimal to diameter conversions for machine screws.

 Decimals Diameters Decimals Diameters .060 = #0 .125 = #5 .073 = #1 .138 = #6 .086 = #2 .164 = #8 .099 = #3 .190 = #10 .112 = #4 .216 = #12

Diameters 1/4 inch and larger are converted from decimals to fractions in 1/16 inch increments. (a) MAJOR DIAMETER: The largest diameter of a screw thread; measured from the crests on external threads and the roots on internal threads. (b) PITCH DIAMETER: The imaginary diameter equal distance between the major and minor diameters. (c) MINOR DIAMETER: The smaller diameter of a screw thread; measured from the roots on external threads and the crests on internal threads. (d) THREAD PITCH: The distance between a given point on a thread and a corresponding point on the next thread. Also referred to as the "lead" which is the distance a screw will advance during one turn. 20 Rancho Circle, Lake Forest, CA 92630 - Tel. 949.770.7711 Fax 949.770.0705 - info@usfastener.com