ZHANGJIAGANG FLAME MACHINERY CO.,LTD.
| Surface | coffee |
| Process | Ti-coated,Black Oxide,Bright finished |
| Material | M35 |
| Type | Twist bits |
| Name | Cobalt Center Drill Bits |
| POINT: | 118/135 Split Point |
| Hardness | HRC65-67 |
| Payment Terms | T/T, L/C, D/P |
| Supply Ability | 400,0000Pcs Per Mouth |
| Delivery Time | 30-45days |
| Packaging Details | Plastic box,Double Blister card |
| Use | ceramic materials |
| Size | 1.5 2.5 3.5 4 5 6 |
| Oem | Available |
| Brand Name | XRTOOLS |
| Model Number | 3.5MM |
| Certification | ISO9000 |
| Place of Origin | JIANG SU |
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Product Specification
| Surface | coffee | Process | Ti-coated,Black Oxide,Bright finished |
| Material | M35 | Type | Twist bits |
| Name | Cobalt Center Drill Bits | POINT: | 118/135 Split Point |
| Hardness | HRC65-67 | Payment Terms | T/T, L/C, D/P |
| Supply Ability | 400,0000Pcs Per Mouth | Delivery Time | 30-45days |
| Packaging Details | Plastic box,Double Blister card | Use | ceramic materials |
| Size | 1.5 2.5 3.5 4 5 6 | Oem | Available |
| Brand Name | XRTOOLS | Model Number | 3.5MM |
| Certification | ISO9000 | Place of Origin | JIANG SU |
| High Light | Cobalt Center hss cobalt drill bits ，hss cobalt drill bits HRC65 ，hss drill bits for metal HRC67 | ||
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.
|
Industry |
Application |
|---|---|
|
CNC Machining |
Spot drilling and hole centering in precision part production |
|
Lathe Turning |
Center marking round workpieces before tailstock drilling |
|
Metal Fabrication |
Chamfered entry holes for bolts, rivets, or deep drilling |
|
Aerospace / Automotive |
Pre-drilling on alloy components exposed to high stress or heat |
|
Mold & Die Workshops |
Guiding holes on hardened blocks prior to threading or reaming |
|
Maintenance / Tool Rooms |
Fast alignment drilling for repairs and structural retrofits |
|
Feature |
Details |
|---|---|
|
Material |
HSS-Co (Cobalt High-Speed Steel, 5% cobalt content) |
|
Coating |
TiAlN (Titanium Aluminum Nitride – dark grey/purple PVD coating) |
|
Point Angles |
60°, 82°, 90° (standard for center & countersink operations) |
|
Available Sizes |
1.0mm – 6.3mm / 1/32" – 1/4" |
|
Tolerance |
h8 on shank, precision-ground point and flute geometry |
|
Hardness |
HRC 65–67 after vacuum heat treatment |
|
Flute Type |
Straight flute – DIN 333 A / B compliant |
|
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
Company Details
Business Type:
Manufacturer,Exporter,Trading Company
Year Established:
2018
Total Annual:
500-600
Employee Number:
135~150
Ecer Certification：
Verified Supplier
Jiangsu Xing Rui Precision Tools Co., Ltd. is a leading manufacturer of high-quality cutting tools in China, established in 2008 and located in Danyang, Jiangsu Province—a major hub for cutting tool production with convenient transportation for global logistics. Main Products We speciali... Jiangsu Xing Rui Precision Tools Co., Ltd. is a leading manufacturer of high-quality cutting tools in China, established in 2008 and located in Danyang, Jiangsu Province—a major hub for cutting tool production with convenient transportation for global logistics. Main Products We speciali...
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