Jacobs 3006288 1/8-5/8in JT3 R8 Shank Keyed Drill Chuck
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The Jacobs 3006288 is a new keyed drill chuck with a 1/8 to 5/8 in (3–16 mm) capacity, JT3 (Jacobs Taper #3) mount, and an integrated R8 shank for direct installation into Bridgeport-style knee mills and compatible vertical milling machines without a separate arbor. The chuck body features a ball-bearing supported sleeve design — visible in the photos as the 'BALL BEARING SUPER' ring engraving — which reduces radial runout and extends service life under sustained drilling loads. Three hardened steel jaws provide concentric clamping across the full capacity range, and a standard keyed tightening mechanism (chuck key included, visible in photo 2) ensures positive jaw lock during operation. This unit is suited for drilling operations on manual knee mills, drill presses fitted with R8 spindles, and similar machine tools where a JT3-arbor chuck with an R8 shank is specified.
Product Specifications
| Brand | Jacobs |
| MPN | 3006288 |
| Chuck Capacity (in) | 1/8 to 5/8 in |
| Chuck Capacity (mm) | 3 to 16 mm |
| Taper Mount | JT3 (Jacobs Taper #3) |
| Shank Type | R8 |
| Chuck Type | Keyed |
| Bearing Type | Ball Bearing |
| Number of Jaws | 3 |
| Chuck Key Included | Yes |
| Condition | New |