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!).
Dimensions in mm.
| 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.
| 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 |
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Copyright © 2022, Arc Euro Trade Ltd. All Rights Reserved.
Copyright © 2022, Arc Euro Trade Ltd. All Rights Reserved.