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JT Drill Chuck Taper Dimensions
The Jacobs Taper (JT) is commonly used to secure a drill chuck to an arbor.
The dimensions below should help you identify the correct arbor for your chuck (or vice-versa!).
| Jacobs Taper | D | d | L | Taper per mm on Diameter | Incl. Angle (Approx.) | |
|---|---|---|---|---|---|---|
| Deg. | Min. | |||||
| 0 | 6.35 | 5.802 | 11.112 | 0.04929 | 2 | 49 |
| 1 | 9.754 | 8.469 | 16.669 | 0.07709 | 4 | 24 |
| 2 Short | 13.94 | 12.386 | 19.05 | 0.08155 | 4 | 39 |
| 2 | 14.199 | 12.386 | 22.225 | 0.08155 | 4 | 39 |
| 33 | 15.85 | 14.237 | 25.4 | 0.0635 | 3 | 38 |
| 6 | 17.17 | 15.852 | 25.4 | 0.05191 | 2 | 58 |
| 3 | 20.599 | 18.951 | 30.956 | 0.05325 | 3 | 02 |
| 4 | 28.55 | 26.346 | 42.049 | 0.05241 | 2 | 59 |
| 5 | 35.89 | 32.422 | 47.625 | 0.05168 | 2 | 58 |
If your chuck dimensions don’t match a taper in the above table then it’s possible you have a DIN 238 taper e.g. B12 or B16.
B Drill Chuck Taper Dimensions
| DIN 238 Taper | D | d | L | Taper per mm on Diameter | Incl. Angle (Approx.) | ||
|---|---|---|---|---|---|---|---|
| Deg. | Min. | Sec. | |||||
| B10 | 10.094 | 9.4 | 14.5 | 0.04988 | 2 | 51 | 27 |
| B12 | 12.065 | 11.1 | 18.5 | 0.04988 | 2 | 51 | 27 |
| B16 | 15.733 | 14.5 | 24 | 0.04995 | 2 | 51 | 41 |
| B18 | 17.78 | 16.2 | 32 | 0.04995 | 2 | 51 | 41 |
| B22 | 21.793 | 19.8 | 40.5 | 0.0502 | 2 | 52 | 31 |
| B24 | 23.825 | 21.3 | 50.5 | 0.0502 | 2 | 52 | 31 |
Morse Taper Dimentions
MT Size | D1 (mm) | D2 (mm) | L2 (mm) | Taper (μm/mm) | Half-Angle | L1 (mm) | L3 (mm) | H (mm) | R (mm) |
0 | 9.045 | 6.401 | 50.8 | 52.051 | 1°29’26” | 59.531 | 6.350 | 3.967 | 4 |
1 | 12.065 | 9.373 | 53.975 | 49.882 | 1°25’43” | 65.087 | 9.525 | 5.159 | 5 |
2 | 17.780 | 14.529 | 65.087 | 49.951 | 1°25’49” | 79.375 | 11.112 | 6.350 | 6 |
3 | 23.825 | 19.761 | 80.962 | 50.196 | 1°26’16” | 98.425 | 14.287 | 7.938 | 7 |
4 | 31.267 | 25.908 | 103.188 | 51.938 | 1°29’15” | 123.825 | 15.875 | 12.159 | 8 |
4.5 | 38.100 | 32.156 | 114.300 | 51.999 | 1°29’22” | N/A | N/A | N/A | N/A |
5 | 44.399 | 37.465 | 131.762 | 52.626 | 1°30’26” | 155.575 | 19.050 | 15.875 | 10 |
6 | 63.348 | 53.746 | 184.150 | 52.138 | 1°29’36” | 217.487 | 28.575 | 19.050 | 13 |
7 | 83.058 | 69.850 | 254.0 | 51.999 | 1°29’22” | 141.275 | 34.925 | 28.575 |
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