Duab NC-20 5-20mm B22 / JT3 Precision Keyed Drill Chuck
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The Duab NC-20 (Art. Nr. 4000025421) is a new precision keyed drill chuck with a clamping range of 5–20 mm (approximately 3/16"–3/4") and a B22 / Jacobs Taper No. 3 (JT3) tapered mount, confirmed by both the chuck body engraving and the MSC packing label reading "PRECISION KEYED DR CHUCK – CAP .2–.787 3JT TAPER." The chuck body is hardened alloy steel, featuring three-jaw self-centering scroll construction, a knurled outer sleeve for manual pre-tightening, and a bevel-gear rack compatible with the included T-handle chuck key. The B22 back taper is the standard mount used on bench drill presses, radial arm drills, and milling machines equipped with a JT3 spindle or adaptor arbor; the chuck ships new-in-box and includes the chuck key. Typical applications include production drilling, secondary drilling operations, and drill press work requiring secure, repeatable tool holding across the full 5–20 mm shank diameter range.
Product Specifications
| Brand | Duab |
| Model / MPN | NC-20 |
| Article Number | 4000025421 |
| Chuck Type | Keyed (key-type), 3-jaw |
| Clamping Range (Metric) | 5–20 mm |
| Clamping Range (Imperial) | 0.197–0.787 in (approx. 3/16–3/4 in) |
| Mount Taper Type | B22 / Jacobs Taper No. 3 (JT3) |
| Taper Standard | JT3 (Jacobs Taper #3) |
| Body Material | Hardened alloy steel |
| Chuck Key Included | Yes |
| Condition | New |