Page History: Dimensions of Standard Tapers
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Page Revision: 2009/11/25 23:54
Morse Tapers
| 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
| 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
| 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
Originally proposed by Oscar J. Beale of Brown & Sharpe, the Jarno tapers are based on a mathematical relationship to the taper number. The major diameter is one-eighth inch per taper number, the minor diameter is one-tenth inch per taper number, and the length is one-half inch per taper number. For example, a #7 Jarno taper is 7/8" at the big end, 0.7000" at the small end, and is 3½" long. All Jarno tapers taper at a rate of 0.6000 inches per foot (0.0500 inch per inch).
| 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 |