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Cobalt high-speed steel in six configurations — round, tri-flat and hex shanks in M35 and M42. From 1/16" to 1/2" with amber-oxide finish and a 135° split point, this ANSI-standard range is built for hard and abrasive materials where standard HSS loses its edge. Factory-direct from a 20-year precision-tools manufacturer with ISO 9001 / 14001 / 45001 triple-system certification.
Ideal for drilling hard and abrasive materials like stainless steel, titanium, and cast iron. Choose M35 for everyday cobalt performance or M42 for maximum heat resistance, in round, tri-flat or hex shank format to match your chuck or quick-change system.
Ideal for drilling hard and abrasive materials like stainless steel, titanium, and cast iron.
| Size | Decimal (in) | Diameter Dia (mm) | OAL (in) | OAL (mm) | FL (in) | FL (mm) | Material | Finish | Point | M35 Round Shank SKU | M35 Tri-flat Shank SKU | M35 Hex Shank SKU | M42 Round Shank SKU | M42 Tri-flat Shank SKU | M42 Hex Shank SKU |
| 1/16 | 0.0625" | 1.6 | 1-7/8" | 47.6 | 7/8" | 22.2 | M35 / M42 | Amber Oxide | 118°Point | 1011231104 | 1011231204 | 1011231304 | 1011331104 | 1011331204 | 1011331304 |
| 5/64 | 0.0781" | 2 | 2" | 50.8 | 1" | 25.4 | M35 / M42 | Amber Oxide | 1011231105 | 1011231205 | 1011231305 | 1011331105 | 1011331205 | 1011331305 | |
| 3/32 | 0.0938" | 2.4 | 2-1/4" | 57.1 | 1-1/4" | 31.8 | M35 / M42 | Amber Oxide | 1011231106 | 1011231206 | 1011231306 | 1011331106 | 1011331206 | 1011331306 | |
| 7/64 | 0.1094" | 2.8 | 2-5/8" | 66.7 | 1-1/2" | 38.1 | M35 / M42 | Amber Oxide | 1011231107 | 1011231207 | 1011231307 | 1011331107 | 1011331207 | 1011331307 | |
| 1/8 | 0.1250" | 3.2 | 2-3/4" | 69.8 | 1-5/8" | 41.3 | M35 / M42 | Amber Oxide | 135° Split Point Double Relief Angle | 1011231108 | 1011231208 | 1011231308 | 1011331108 | 1011331208 | 1011331308 |
| 9/64 | 0.1406" | 3.6 | 2-7/8" | 73 | 1-3/4" | 44.4 | M35 / M42 | Amber Oxide | 1011231109 | 1011231209 | 1011231309 | 1011331109 | 1011331209 | 1011331309 | |
| 5/32 | 0.1562" | 4 | 3" | 76.2 | 1-7/8" | 47.6 | M35 / M42 | Amber Oxide | 1011231110 | 1011231210 | 1011231310 | 1011331110 | 1011331210 | 1011331310 | |
| 11/64 | 0.1719" | 4.4 | 3-1/8" | 79.4 | 2" | 50.8 | M35 / M42 | Amber Oxide | 1011231111 | 1011231211 | 1011231311 | 1011331111 | 1011331211 | 1011331311 | |
| 3/16 | 0.1875" | 4.8 | 3-1/2" | 88.9 | 2-1/8" | 54 | M35 / M42 | Amber Oxide | 1011231112 | 1011231212 | 1011231312 | 1011331112 | 1011331212 | 1011331312 | |
| 13/64 | 0.2031" | 5.2 | 3-5/8" | 92.1 | 2-1/4" | 57.1 | M35 / M42 | Amber Oxide | 1011231113 | 1011231213 | 1011231313 | 1011331113 | 1011331213 | 1011331313 | |
| 7/32 | 0.2188" | 5.6 | 3-3/4" | 95.2 | 2-3/8" | 60.3 | M35 / M42 | Amber Oxide | 1011231114 | 1011231214 | 1011231314 | 1011331114 | 1011331214 | 1011331314 | |
| 15/64 | 0.2344" | 6 | 3-7/8" | 98.4 | 2-1/2" | 63.5 | M35 / M42 | Amber Oxide | 1011231115 | 1011231215 | 1011231315 | 1011331115 | 1011331215 | 1011331315 | |
| 1/4 | 0.2500" | 6.3 | 4" | 101.6 | 2-3/4" | 69.8 | M35 / M42 | Amber Oxide | 1011231116 | 1011231216 | 1011231316 | 1011331116 | 1011331216 | 1011331316 | |
| 17/64 | 0.2656" | 6.7 | 4-1/8" | 104.8 | 2-7/8" | 73 | M35 / M42 | Amber Oxide | 1011231117 | 1011231217 | 1011231317 | 1011331117 | 1011331217 | 1011331317 | |
| 9/32 | 0.2812" | 7.1 | 4-1/4" | 107.9 | 3" | 76.2 | M35 / M42 | Amber Oxide | 1011231118 | 1011231218 | 1011231318 | 1011331118 | 1011331218 | 1011331318 | |
| 19/64 | 0.2969" | 7.5 | 4-3/8" | 111.1 | 3-1/8" | 79.4 | M35 / M42 | Amber Oxide | 1011231119 | 1011231219 | 1011231319 | 1011331119 | 1011331219 | 1011331319 | |
| 5/16 | 0.3125" | 7.9 | 4-1/2" | 114.3 | 3-1/4" | 82.5 | M35 / M42 | Amber Oxide | 1011231120 | 1011231220 | 1011231320 | 1011331120 | 1011331220 | 1011331320 | |
| 21/64 | 0.3281" | 8.3 | 4-5/8" | 117.5 | 3-3/8" | 85.7 | M35 / M42 | Amber Oxide | 1011231121 | 1011231221 | 1011231321 | 1011331121 | 1011331221 | 1011331321 | |
| 11/32 | 0.3438" | 8.7 | 4-3/4" | 120.6 | 3-1/2" | 88.9 | M35 / M42 | Amber Oxide | 1011231122 | 1011231222 | 1011231322 | 1011331122 | 1011331222 | 1011331322 | |
| 23/64 | 0.3594" | 9.1 | 4-7/8" | 123.8 | 3-5/8" | 92.1 | M35 / M42 | Amber Oxide | 1011231123 | 1011231223 | 1011231323 | 1011331123 | 1011331223 | 1011331323 | |
| 3/8 | 0.3750" | 9.5 | 5" | 127 | 3-3/4" | 95.2 | M35 / M42 | Amber Oxide | 1011231124 | 1011231224 | 1011231324 | 1011331124 | 1011331224 | 1011331324 | |
| 25/64 | 0.3906" | 9.9 | 5-1/8" | 130.2 | 3-7/8" | 98.4 | M35 / M42 | Amber Oxide | 1011231125 | 1011231225 | 1011231325 | 1011331125 | 1011331225 | 1011331325 | |
| 13/32 | 0.4062" | 10.3 | 5-1/4" | 133.3 | 4" | 101.6 | M35 / M42 | Amber Oxide | 1011231126 | 1011231226 | 1011231326 | 1011331126 | 1011331226 | 1011331326 | |
| 27/64 | 0.4219" | 10.7 | 5-3/8" | 136.5 | 4-1/8" | 104.8 | M35 / M42 | Amber Oxide | 1011231127 | 1011231227 | 1011231327 | 1011331127 | 1011331227 | 1011331327 | |
| 7/16 | 0.4375" | 11.1 | 5-1/2" | 139.7 | 4-1/4" | 107.9 | M35 / M42 | Amber Oxide | 1011231128 | 1011231228 | 1011231328 | 1011331128 | 1011331228 | 1011331328 | |
| 29/64 | 0.4531" | 11.5 | 5-5/8" | 142.9 | 4-3/8" | 111.1 | M35 / M42 | Amber Oxide | 1011231129 | 1011231229 | 1011231329 | 1011331129 | 1011331229 | 1011331329 | |
| 15/32 | 0.4688" | 11.9 | 5-3/4" | 146 | 4-1/2" | 114.3 | M35 / M42 | Amber Oxide | 1011231130 | 1011231230 | 1011231330 | 1011331130 | 1011331230 | 1011331330 | |
| 31/64 | 0.4844" | 12.3 | 5-7/8" | 149.2 | 4-5/8" | 117.5 | M35 / M42 | Amber Oxide | 1011231131 | 1011231231 | 1011231331 | 1011331131 | 1011331231 | 1011331331 | |
| 1/2 | 0.5000" | 12.7 | 6" | 152.4 | 4-3/4" | 120.6 | M35 / M42 | Amber Oxide | 1011231132 | 1011231232 | 1011231332 | 1011331132 | 1011331232 | 1011331332 |
Bulk packs or individual industrial plastic tubes.
Professional OEM Support: We provide comprehensive private labeling services.
Customized Packaging: Blister cards, plastic boxes, and logo etching can be fully customized to meet your specific brand requirements and local market standards.
Manufactured to ANSI standards in an ISO 9001 / 14001 / 45001 triple-certified facility — every drill is inspected before packing.
M35 (5% cobalt) balances edge life and cost for general hard-material drilling; M42 (8% cobalt) delivers the highest heat resistance for stainless and titanium production runs.
Round shank for standard chucks, tri-flat for positive-grip chucks, hex for impact drivers and quick-change holders.
Yes — custom branding, packaging and bulk size-assortment programs are available.
Email [email protected] or message us on WhatsApp for wholesale pricing, samples and lead times.
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