Tapers

Jacobs Taper

The Jacobs Taper (abbreviated JT eg JT0 or JT3) is commonly used to secure drill press chucks to an arbor.

Taper Large End Small End Length Taper/
Foot
Taper/
Inch
1/2 Included Angle
#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°

 

Morse Taper

A self-holding standard taper largely used on small cutting tools such as drills, end mills, and reamers, and, on some machines, spindles in which these tools are used.

Morse Taper No. Gauge Depth (inches) Gauge Diameter (inches) Hang (inches) Taper per inch 1/2 included angle °
0 2 0.252 1/8 0.05205 1° 29′ 30”
1 21/8 0.369 1/8 0.04988 1° 26′
2 29/16 0.572 3/16 0.04995 1° 26′
3 33/16 0.778 3/16 0.05020 1° 26′ 15”
4 41/16 1.02 1/4 0.05194 1° 29′
5 53/16 1.475 1/4 0.05263 1° 30′ 30”
6 71/4 2.116 5/16 0.05214 1° 30′
7 10 2.75 3/8 0.052 1° 30′

 

About Nigel 135 Articles
Have been making models since I was around 7 years old and using a lathe from the age of 11, a self taught engineer with a passion for making model engines.

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