Morse Taper sizes

Different Morse tapers have easily distinguished sizes.

Measure at the big end (ie, the open hole), in inches:

• #0 is 0.356

• #1 is 0.475

• #2 is 0.700

• #3 is 0.938

• #4 is 1.231,

• #5 is 1.748

• #6 is 2.494

• #7 is 3.270

Principal dimensions of Morse Taper Shank in accordance with BS1660, 1972 / ISO 296/DIN 228

MORSE TAPER No. A mm B mm C mm D mm E mm TAPER per mm on dia. 1 12.065 62.0 65.5 5.2 5 0.04988 2 17.780 75.0 80.0 6.3 6 0.04995 3 23.825 94.0 99.0 7.9 7 0.05020 4 31.267 117.5 124.0 11.9 8 0.05194 5 44.399 149.5 156.0 15.9 10 0.05263