This document covers a dual dimensioning practice that provides both U.S. customary inch-pound units and SI metric units for all dimensions on the field of the drawing. The scope does not include the "chart method"-whereby drawings are dimensioned only in SI units-with conversions to inch-pound units provided in chart form (usually computer-generated) on the drawing. Further information on the chart method is found in SAE Handbook Supplement J1066, "Recommended Guidelines for Company Metrication Programs in the Metalworking Industry."