& SHARPE AND JARNO TAPERS
STANDARD TAPERS: Certain types of small tools and machine parts, such
as twist drills, end mills, arbors, lathe centers, etc., are provided with
taper shanks which fit into spindles or sockets of corresponding taper,
thus providing not only accurate alignment between the tool or other part
and its supporting member but also more or less frictional resistance for
driving the tool. There are several standards for "self-holding"
tapers but the Morse and the Brown & Sharpe are the standards most
widely used by American manufactures.