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| Brand Name: | XRTOOLS |
| Model Number: | 3.5MM |
| MOQ: | 500PCS |
| Price: | 0.05-2.7$/PCS |
| Delivery Time: | 30-45days |
| Payment Terms: | T/T, L/C, D/P |
Cobalt Center Drill Bit with TiAlN Coating – For Spot Drilling and Chamfering Metal
As a specialized manufacturer of precision cutting tools, XRTOOLS brings decades of engineering experience to the development of advanced drill bits for industrial use. Our HSS-Co Center Drill Bit, treated with a TiAlN (Titanium Aluminum Nitride) coating, represents the fusion of metallurgical excellence, precision CNC manufacturing, and application-driven design.
This center drill bit is engineered for spotting, centering, chamfering, and pilot hole preparation across a wide range of hard metals. Constructed from 5% cobalt high-speed steel (HSS-Co), it offers excellent hot hardness and wear resistance, ensuring durability in high-speed machining environments.
Each XRTOOLS center drill bit is produced under ISO-standardized procedures using industry-leading CNC equipment. Our commitment to quality ensures every tool exceeds the performance standards of metalworking professionals.
Material Selection – HSS-Co with 5% cobalt for thermal resistance
Forging & Roughing – High-pressure forged blanks ensure consistent grain structure
CNC Milling & Grinding – Precision geometry on point angles and flute profiles
Vacuum Heat Treatment – Achieving HRC 65–67 for edge retention
TiAlN Coating – Advanced ceramic layer via PVD for heat shielding and lubricity
100% Quality Control – Runout, concentricity, hardness, and coating thickness tested
XRTOOLS tools are built to outperform in real-world industrial applications—delivering reliability, consistency, and service life demanded by today’s professionals.
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Industry |
Application |
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CNC Machining |
Spot drilling and hole centering in precision part production |
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Lathe Turning |
Center marking round workpieces before tailstock drilling |
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Metal Fabrication |
Chamfered entry holes for bolts, rivets, or deep drilling |
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Aerospace / Automotive |
Pre-drilling on alloy components exposed to high stress or heat |
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Mold & Die Workshops |
Guiding holes on hardened blocks prior to threading or reaming |
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Maintenance / Tool Rooms |
Fast alignment drilling for repairs and structural retrofits |
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Feature |
Details |
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Material |
HSS-Co (Cobalt High-Speed Steel, 5% cobalt content) |
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Coating |
TiAlN (Titanium Aluminum Nitride – dark grey/purple PVD coating) |
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Point Angles |
60°, 82°, 90° (standard for center & countersink operations) |
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Available Sizes |
1.0mm – 6.3mm / 1/32" – 1/4" |
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Tolerance |
h8 on shank, precision-ground point and flute geometry |
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Hardness |
HRC 65–67 after vacuum heat treatment |
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Flute Type |
Straight flute – DIN 333 A / B compliant |
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Overall Length |
38mm – 80mm depending on size specification |
Individual Packaging: Plastic tube with label (customizable)
Bulk Options: 10 / 50 pcs in inner boxes or export cartons
OEM Branding Support:
Laser-marked logo and part number
EN/RU bilingual labels
Optional coating (TiN / TiCN / Black Oxide)
Custom size development available
Expertise in Cutting Tools – Over 20 years of R&D and OEM production
Advanced Manufacturing – Full CNC production line & automated QA systems
Global Supply Coverage – Serving clients across North America, Eastern Europe, and Asia
Application-Centered Design – Tools developed with feedback from real-world users
Consistency + Performance – Each tool delivers reliable, repeatable cutting results
