HSS Cobalt Taper Shank Drill Bit
HSS cobalt taper shank drill bits combine the positive-drive of Morse taper mounting with the heat resistance of cobalt-enhanced steel for the most demanding industrial drilling applications. Available in M35 (5% Cobalt) and M42 (8% Cobalt) grades, these bits feature Morse taper shanks (MT1-MT5) and deliver exceptional performance when drilling stainless steel, titanium, Inconel, and other high-temperature alloys on drill presses, lathes, and milling machines. The cobalt alloy maintains cutting edge hardness at elevated temperatures while the taper shank provides self-locking, vibration-free drive.
HSS Cobalt Taper Shank Drill Bit Technical Data
| Specification | Details |
|---|---|
| Grade | HSS-Co M35 (5% Cobalt) / HSS-Co M42 (8% Cobalt) |
| Shank Type | Morse Taper (MT1, MT2, MT3, MT4, MT5) |
| Standard | DIN 345 |
| Point Angle | 135° Split Point |
| Hardness | HRC 65-67 |
| Drill Diameter Range | 12.00mm to 70.00mm |
| Application | Stainless Steel, Titanium, Inconel, Heat-Resistant Alloys |
HSS Cobalt Taper Shank Drill Bit Size Chart (DIN 345)
| Diameter (mm) | Flute Length (mm) | Overall Length (mm) | Morse Taper |
|---|---|---|---|
| 12.00 | 101 | 182 | MT1 |
| 12.50 | 101 | 182 | MT1 |
| 14.00 | 108 | 189 | MT1 |
| 14.50 | 114 | 212 | MT1 |
| 15.00 | 114 | 212 | MT1 |
| 15.50 | 120 | 218 | MT1 |
| 16.00 | 120 | 218 | MT2 |
| 16.50 | 125 | 223 | MT2 |
| 17.00 | 130 | 228 | MT2 |
| 17.50 | 130 | 228 | MT2 |
| 18.00 | 130 | 228 | MT2 |
| 18.50 | 135 | 233 | MT2 |
| 19.00 | 135 | 233 | MT2 |
| 19.50 | 140 | 238 | MT2 |
| 20.00 | 140 | 238 | MT2 |
| 21.00 | 145 | 243 | MT2 |
| 22.00 | 150 | 248 | MT2 |
| 23.00 | 155 | 253 | MT2 |
| 24.00 | 160 | 281 | MT3 |
| 25.00 | 160 | 281 | MT3 |
| 26.00 | 165 | 286 | MT3 |
| 27.00 | 170 | 291 | MT3 |
| 28.00 | 170 | 291 | MT3 |
| 29.00 | 175 | 296 | MT3 |
| 30.00 | 175 | 296 | MT3 |
| 31.00 | 180 | 301 | MT3 |
| 32.00 | 185 | 334 | MT4 |
| 33.00 | 185 | 334 | MT4 |
| 34.00 | 190 | 339 | MT4 |
| 35.00 | 190 | 339 | MT4 |
| 36.00 | 195 | 344 | MT4 |
| 37.00 | 195 | 344 | MT4 |
| 38.00 | 200 | 349 | MT4 |
| 39.00 | 200 | 349 | MT4 |
| 40.00 | 200 | 349 | MT4 |
| 41.00 | 205 | 354 | MT4 |
| 42.00 | 205 | 354 | MT4 |
| 43.00 | 210 | 359 | MT4 |
| 44.00 | 210 | 359 | MT4 |
| 45.00 | 210 | 359 | MT4 |
| 46.00 | 215 | 364 | MT4 |
| 47.00 | 215 | 364 | MT4 |
| 48.00 | 220 | 369 | MT4 |
| 49.00 | 220 | 369 | MT4 |
| 50.00 | 220 | 369 | MT4 |
| 51.00 | 225 | 412 | MT5 |
| 52.00 | 225 | 412 | MT5 |
| 53.00 | 230 | 417 | MT5 |
| 55.00 | 230 | 417 | MT5 |
| 56.00 | 235 | 422 | MT5 |
| 58.00 | 235 | 422 | MT5 |
| 60.00 | 235 | 422 | MT5 |
| 62.00 | 240 | 427 | MT5 |
| 63.00 | 240 | 427 | MT5 |
| 65.00 | 245 | 432 | MT5 |
| 68.00 | 250 | 437 | MT5 |
| 70.00 | 250 | 437 | MT5 |
| 72.00 | 255 | 442 | MT5 |
| 75.00 | 260 | 447 | MT5 |
| 76.00 | 260 | 447 | MT5 |
HSS Cobalt Taper Shank Drilling Tools for Heavy-Duty Hard Material Drilling
HSS cobalt taper shank drill bits represent the highest tier of twist drill performance, combining the heat-resistant properties of cobalt steel with the robust mounting of Morse taper shanks. These bits are specifically engineered for industrial environments where standard HSS bits cannot withstand the combination of high torque, elevated temperatures, and abrasive materials. Typical applications include marine propeller shaft drilling, oil and gas flange preparation, chemical plant maintenance, and aerospace component manufacturing.
The 135° split point geometry ensures positive cutting action with reduced thrust requirements, while the cobalt content maintains cutting edge integrity at friction temperatures exceeding 600°C. Precision-ground flutes are designed for efficient chip evacuation at deeper drilling depths, and the Morse taper shank guarantees concentric rotation without slippage in machine tool spindles.
For standard duty applications with straight shank mounting, see our HSS Jobber Drilling Tools with 1/2-inch Parallel Shank for general workshop drilling.
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