Machinery's Handbook, 31st Edition
1030
Standard Tapers Table 3. American National Standard Draw-In Bolt Ends ANSI/ASME B5.18-1972 (R2014)
M
D
B
C
A
Length of Usable Thread
Size of Thread for Small End UNC-2A D
Size of Thread for Large End UNC-2A M
Length of Usable Thread at Small End B
Size No.
on Large Diameter C
Length of Small End A
30 40 45 50 60
1.06 1.25 1.50 1.50 1.75
0.75 1.00 1.12 1.25 1.37
0.75 1.12 1.25 1.38 2.00
0.500-13 0.625-11 0.750-10 1.000-8 1.250-7
0.375-16 0.500-13 0.625-11 0.625-11
1.000-8
All dimensions are given in inches. Table 4. American National Standard Pilot Lead on Centering Plugs for Flatback Milling Cutters ANSI/ASME B5.18-1972 (R2014)
T .0002
.0625 .0250
30°
Lead Diameter
Plot Diameter
Face of Spindle
– T –
.03125
Max Lead Diameter = Max Pilot Diameter – .003 Min Lead Diameter = Min Pilot Diameter – .006
American Standard Taper 3.500 Inch per Ft.
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