Nachi LIST9617 21/64 x 196 x 246mm 20D Aqua Drill EX Long Carbide Drill
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The Nachi Aqua Drill EX (LIST9617) is a solid carbide, coolant-through, extra-long series twist drill designed for deep-hole drilling up to 20× diameter in a single pass. This specific drill measures 21/64 in (0.328 in) in diameter with a 196 mm (7.72 in) flute length and 246 mm (9.69 in) overall length, as confirmed by the label designation "21/64X196X246 20D." The Aqua Drill EX series features Nachi's proprietary AquaReivo coating (a multi-layer PVD coating optimized for high-speed drilling with coolant), a 140° split-point geometry for self-centering and reduced thrust force, and through-coolant channels that deliver cutting fluid directly to the cutting edge — enabling aggressive feed rates and extended tool life in steel, alloy steel, and cast iron. The drill has a straight shank for use in standard collet chucks, hydraulic chucks, or shrink-fit toolholders and is offered here in new, unused condition.
Product Specifications
| Brand | Nachi |
| Series | Aqua Drill EX |
| List Number | LIST9617 |
| Drill Diameter | 21/64 in (0.3281 in / 8.334 mm) |
| Flute Length | 196 mm (7.72 in) |
| Overall Length | 246 mm (9.69 in) |
| Depth of Cut Ratio | 20xD |
| Shank Type | Straight (cylindrical) |
| Construction | Solid carbide |
| Coating | AquaReivo PVD multi-layer coating |
| Point Angle | 140° |
| Point Type | Split point |
| Coolant | Through-coolant (internal channels) |
| Condition | New |