Which issue of _Machinery's Handbook_? In my 25th edition, it
is on page 910 at the top, with source dates relating it to ANSI 1981 &
My 15th edition has it on page 1416 -- also at the top. The
source dates there reference ASA B5.10-1953, so it has been around for a
Yes, it is. Actually, the ASA tapers are made up from three
.239 through .375 is a Brown & Sharpe taper series
1 through 7 (including 4-1/2) is derived from the Morse taper
200 through 1200 are the 0.750 (3/4" per foot) series.
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