USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
FIGURE 150.
CONVERSION CHART - MILLIMETERS TO INCHES.
a. Standards of Length.
Two systems, the English and Metric, are
commonly used in the design of measuring tools for linear measurements. The
English system uses inches, feet, and yards; the Metric system uses
millimeters, centimeters, and meters. In relation to each other, 1 inch is
equivalent to 25.4 millimeters, or 1 millimeter is equivalent to 0.039370
inch. Refer to figures 150 through 156 (above and on the following pages)
to facilitate conversion between systems.
b. Standards of Screw Threads. There are several screw thread systems
that are recognized as standards throughout the world. All threaded items
for Ordnance used in the United States, Great Britain, and Canada are
specified in the Unified System. However, the existing inch measure screw
thread systems should be understood despite the existence of the Unified
System.
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