Drill Chucks & Adapters
The Jacobs Taper (abbreviated JT) is commonly used to secure drill press chucks to an arbor. The taper angles are not consistent varying from 1.41° per side for #0 (and the obscure #2+1/2) to 2.33° per side for #2 (and #2 short).
There are also several sizes between #2 and #3: #2 short, #6 and #33
| Taper | Small End | Big End | Length |
|---|---|---|---|
| #0 | 0.22844 in (5.8024 mm) | 0.2500 in (6.3500 mm) | 0.43750 in (11.113 mm) |
| #1 | 0.33341 in (8.4686 mm) | 0.3840 in (9.7536 mm) | 0.65625 in (16.669 mm) |
| #2 | 0.48764 in (12.386 mm) | 0.5590 in (14.199 mm) | 0.87500 in (22.225 mm) |
| #2 Short | 0.48764 in (12.386 mm) | 0.5488 in (13.940 mm) | 0.75000 in (19.050 mm) |
| #21/2 | 0.625 in (15.875 mm) | 0.677 in (17.196 mm) | 1.055 in (26.797 mm) |
| #3 | 0.74610 in (18.951 mm) | 0.8110 in (20.599 mm) | 1.21875 in (30.956 mm) |
| #4 | 1.0372 in (26.345 mm) | 1.1240 in (28.550 mm) | 1.6563 in (42.070 mm) |
| #5 | 1.3161 in (33.429 mm) | 1.4130 in (35.890 mm) | 1.8750 in (47.625 mm) |
| #6 | 0.6241 in (15.852 mm) | 0.6760 in (17.170 mm) | 1.0000 in (25.400 mm) |
| #33 | 0.5605 in (14.237 mm) | 0.6240 in (15.850 mm) | 1.0000 in (25.400 mm) |
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