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Learn about the different types and standards of drill bit sizes, such as metric, fractional-inch and gauge drill bits. Find tables, charts and formulas to convert and compare drill bit sizes.
Find the appropriate tap drill for any thread size in imperial and metric systems up to 36.5 mm diameter. Learn the rules of thumb and examples for choosing the best tap drill based on major diameter, pitch, or major minus pitch.
Width across flats is the distance between two parallel surfaces on the head of a screw or bolt, or a nut, mostly for torque transmission by positive locking. Learn about the different forms, spanner sizes, and tolerances of width across flats in metric and inch systems.
Learn about the history and status of the metric system in the U.S., which is the preferred system of weights and measures for trade and commerce since 1975. Find out how U.S. customary units are defined in terms of metric units and how some industries and fields use the SI system extensively.
Learn how to convert units of measurement using the factor–label method, a technique that cancels out dimensional units with fractions. Find out the limitations and applications of this method for different types of units and equations.
The U.S. customary system is a system of measurement units derived from English units and used in the U.S. and some territories. It is based on the inch, foot, yard, and mile for length, and the pound, ounce, and gallon for mass and volume.
The metric system is a decimal-based system of measurement that uses seven base units and metric prefixes. It evolved from the French Revolution and is now the official system of weights and measures in most countries.
Learn about the history, current practice and variations of different systems of units of measurement, such as the metric system, the imperial system and the US customary system. Compare the base units, derived units and prefixes of each system and their applications in science, commerce and everyday life.
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