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parts, and accessories for bench top machinists.
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Dimensions of Standard Tapers

Morse Tapers

    Jacobs   Brown & Sharp   Jarno   Top
 Taper  Large End Small End Length Taper/
Foot
Taper/
Inch
Angle From Center
#0 0.3561 0.2520 2.00 .6246 .0521 1.4908
#1 0.4750 0.3690 2.13 .5986 .0499 1.4287
#2 0.7000 0.5720 2.56 .5994 .0500 1.4307
#3 0.9380 0.7780 3.19 .6024 .0502 1.4377
#4 1.2310 1.0200 4.06 .6233 .0519 1.4876
#4-1/2 1.5000 1.2660 4.50 .6240 .0520 1.4894
#5 1.7480 1.4750 5.19 .6315 .0526 1.5073
#6 2.4940 2.1160 7.25 .6257 .0521 1.4933
#7 3.2700 2.7500 10.00 .6240 .0520 1.4894

 

Jacobs Tapers

    Morse   Brown & Sharp   Jarno   Top
Taper Large End Small End Length Taper/
Foot
Taper/
Inch
Angle From Center
#0 0.2500 0.2284 0.44 .5915 .0493 1.4117
#1 0.3840 0.3334 0.66 .9251 .0771 2.2074
#2 0.5590 0.4876 0.88 .9786 .0816 2.3350
#2 Short 0.5488 0.4876 0.75 .9786 .0816 2.3350
#3 0.8110 0.7461 1.22 .6390 .0532 1.5251
#4 1.1240 1.0372 1.66 .6289 .0524 1.5009
#5 1.4130 1.3161 1.88 .6201 .0517 1.4801
#6 0.6760 0.6241 1.00 .6229 .0519 1.4868
#33 0.6240 0.5605 1.00 .7619 .0635 1.8184

 

Brown & Sharpe Tapers

    Morse   Jacobs   Jarno   Top
Taper Large End Small End Length Taper/
Foot
Taper/
Inch
Angle From Center
#1 0.2392 0.2000 0.94 .5020 .0418 1.1983
#2 0.2997 0.2500 1.19 .5020 .0418 1.1983
#3 0.3753 0.3125 1.50 .5020 .0418 1.1983
#4 0.4207 0.3500 1.69 .5024 .0419 1.1992
#5 0.5388 0.4500 2.13 .5016 .0418 1.1973
#6 0.5996 0.5000 2.38 .5033 .0419 1.2013
#7 0.7201 0.6000 2.88 .5015 .0418 1.1970
#8 0.8987 0.7500 3.56 .5010 .0418 1.1959
#9 1.0775 0.9001 4.25 .5009 .0417 1.1955
#10 1.2597 1.0447 5.00 .5161 .0430 1.2320
#11 1.4978 1.2500 5.94 .5010 .0418 1.1959
#12 1.7968 1.5001 7.13 .4997 .0416 1.1928
#13 2.0731 1.7501 7.75 .5002 .0417 1.1940
#14 2.3438 2.0000 8.25 .5000 .0417 1.1935
#15 2.6146 2.2500 8.75 .5000 .0417 1.1935
#16 2.8854 2.5000 9.25 .5000 .0417 1.1935
#17 3.1563 2.7500 9.75 .5000 .0417 1.1935
#18 3.4271 3.0000 10.25 .5000 .0417 1.1935

 

Jarno Tapers

    Morse   Jacobs   Brown & Sharp   Top
Taper Large End Small End Length Taper/
Foot
Taper/
Inch
Angle From Center
#2 0.2500 0.2000 1.00 .6000 .0500 1.4321
#3 0.3750 0.3000 1.50 .6000 .0500 1.4321
#4 0.5000 0.4000 2.00 .6000 .0500 1.4321
#5 0.6250 0.5000 2.50 .6000 .0500 1.4321
#6 0.7500 0.6000 3.00 .6000 .0500 1.4321
#7 0.8750 0.7000 3.50 .6000 .0500 1.4321
#8 1.0000 0.8000 4.00 .6000 .0500 1.4321
#9 1.1250 0.9000 4.50 .6000 .0500 1.4321
#10 1.2500 1.0000 5.00 .6000 .0500 1.4321
#11 1.3750 1.1000 5.50 .6000 .0500 1.4321
#12 1.5000 1.2000 6.00 .6000 .0500 1.4321
#13 1.6250 1.3000 6.50 .6000 .0500 1.4321
#14 1.7500 1.4000 7.00 .6000 .0500 1.4321
#15 1.8750 1.5000 7.50 .6000 .0500 1.4321
#16 2.0000 1.6000 8.00 .6000 .0500 1.4321
#17 2.1250 1.7000 8.50 .6000 .0500 1.4321
#18 2.2500 1.8000 9.00 .6000 .0500 1.4321
#19 2.3750 1.9000 9.50 .6000 .0500 1.4321
#20 2.5000 2.0000 10.00 .6000 .0500 1.4321
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