M35 Cobalt HSS Center Drills – TiN Coated
TiN-coated M35 cobalt HSS center drills for center-hole preparation and controlled hole starting. The double-ended drawing marks 60° and 120° features and lists seven cutting diameters from 1.5 to 6 mm, with size-specific shank diameters and overall lengths.
Product Specifications
Consistent Quality
Consistent geometry across repeat orders.
Flexible Orders
Small batches and mixed sizes available.
OEM Support
Custom marking, labels and packaging.
Standard & Custom
Standard sizes and custom configurations.
M35 Cobalt HSS Center Drills – TiN Coated Overview
These M35 cobalt high-speed steel center drills are offered with a TiN-coated finish for center-hole preparation and accurate hole starting. The supplied drawing shows a double-ended tool with 60° and 120° included-angle features. Its seven listed sizes cover cutting diameter d from 1.5 to 6 mm, shank diameter d1 from 4 to 14 mm and overall length L from 36.5 to 70 mm. Match the specified geometry and tool size to the required center-hole form, workpiece and holder before ordering.
Key Configuration
The drawing marks 60° and 120° features on opposite ends. Confirm the required end and center-hole form for the application.
Check which cutting end is required, along with holder grip and clearance for the opposite end.
Each cutting diameter d has its own shank diameter d1, overall length L and listed L1 dimension.
Key Product Advantages
M35 HSS Substrate
A cobalt-bearing HSS grade for this product configuration.
TiN-Coated Finish
The stated finish; confirm coverage and specification for the ordered model.
Two Tool Ends
The drawing shows cutting features at both ends.
Seven Listed Sizes
Select d, d1, L and L1 from the exact size row.
Centering Applications
Use the specified end to prepare a center hole for turning between centers or to establish a starting location for a subsequent drilling operation, where its geometry is suitable. Review the workpiece grade, machine setup, holder and coolant before selecting cutting data.
Workpiece Material Selection
Provide the exact workpiece grade and hardness when requesting a starting speed and feed. M35 substrate and TiN finish describe the tool; the dimension chart does not establish suitability or cutting data for every steel, stainless steel, cast iron or nonferrous alloy.
Product Details & Available Configurations
The machining video is retained from the original product page. Use the dimension chart in Specifications to choose the exact size; confirm the coating and end geometry for the model quoted.
The video illustrates machining; it does not specify cutting conditions or establish a tool-life or accuracy guarantee for all sizes and workpieces.
Size Chart & Specifications
The supplied drawing lists seven center drill sizes from d = 1.5 to 6 mm. Shank diameter d1 ranges from 4 to 14 mm, overall length L from 36.5 to 70 mm and the dimension labeled flute length L1 from 2 to 8 mm. All dimensions below are in millimeters. Check the full row and the required 60° or 120° end geometry before ordering.
| Size d (mm) | Shank Dia. d1 (mm) | Overall Length L (mm) | Flute Length L1 (mm) |
|---|---|---|---|
| 1.5 | 4 | 36.5 | 2 |
| 2 | 5 | 41 | 2.6 |
| 2.5 | 6 | 44.5 | 3 |
| 3 | 8 | 50 | 4 |
| 4 | 10 | 57 | 5 |
| 5 | 12 | 64 | 6 |
| 6 | 14 | 70 | 8 |
Specification confirmation: M35 and TiN are stated in the product title and original page, but the dimension chart does not provide cobalt percentage, coating thickness, hardness, tolerance or a machining standard. Confirm these items on the quotation or approved product drawing when required.
HSS Center Drill Speeds & Feed Settings
Choose starting cutting data for the actual cutting diameter, selected end, workpiece grade and hardness, tool holding and coolant. The dimension chart does not provide speed or feed values. The old product-page figures are not tied to a specific size and workpiece setup.
Setting Speed & Feed
Spindle speed: n = (1000 × Vc) / (π × d), where n is RPM, Vc is cutting speed in m/min and d is the diameter at the active cutting end in mm.
Feed rate: F = n × f, where F is feed in mm/min and f is feed per revolution in mm/rev.
Calculation example: At 500 RPM and 0.02 mm/rev, programmed feed is 10 mm/min. This illustrates the formula only and is not a recommended setting for any workpiece.
For additional reference, see our HSS cutting tools speeds & feeds guide. Confirm tool-specific values for the chosen center drill and workpiece.
HSS Drill Customization & OEM
HSS drills can be reviewed against your hole requirements, workpiece material and machine setup. We can discuss application-specific dimensions, cutting geometry, tool material, surface finish and private-label presentation. Available options depend on the drill type and the confirmed manufacturing specification.
Point & Cutting Geometry
Review point angle, point thinning, flute design and cutting-edge geometry according to the workpiece and drilling operation. Geometry options vary between twist drills, center drills and special drills.
Dimensions & Shank
Specify cutting diameter, flute length, overall length and the required shank configuration. Straight-shank, Morse-taper, extra-long and other constructions are reviewed by product series.
Finish & OEM Branding
Review a suitable coating or surface finish where applicable. Laser marking, labels and packaging can be discussed for distributor and private-label orders.
Customization Options
| Parameter | Information to Confirm |
|---|---|
| Drill Type | Twist drill, center drill, extra-long drill or application-specific design |
| Tool Material | Required HSS grade, such as M2, M35 or M42, subject to the selected series |
| Diameter | Cutting diameter and required diameter tolerance |
| Length & Reach | Flute length, overall length, drilling depth and clearance requirements |
| Point & Flutes | Point geometry, flute design and chip-evacuation requirements |
| Shank | Shank type and dimensions required by the holder |
| Surface Finish | Uncoated, coated or treated finish, where suitable for the tool and application |
| OEM Presentation | Tool marking, product labels and packaging requirements |
Options are reviewed for the specific product and order. A listed option does not imply that every HSS drill series has the same material, geometry, shank or coating choices.
What to Send for a Custom Drill Quote
Send the drill type, diameter, hole depth, workpiece grade, required geometry, shank or holder details, quantity and any coating or marking requirements. A drawing or reference sample helps confirm non-standard dimensions.
Submit a Custom Tool RequestHSS Drill Quality Control
HSS drills are reviewed against the confirmed product specification or approved drawing. Checks are selected according to drill type, size, geometry and finish, from incoming material through grinding, final inspection and packing.
Material Verification
Check the specified HSS grade and incoming material information against the production order.
In-Process Checks
Review key dimensions and ground features during production so deviations can be addressed before final inspection.
Final Tool Inspection
Check the applicable diameter, lengths, point geometry, cutting edges and shank against the approved specification.
Marking & Packing
Verify the model identification, order quantity and agreed packaging before dispatch.
Inspection Checkpoints
| Feature | Check Against the Confirmed Specification |
|---|---|
| Cutting Diameter | Nominal size and specified diameter tolerance |
| Flute & Overall Length | Required cutting length, tool reach and overall dimension |
| Point Geometry | Point angle, symmetry and specified point features |
| Cutting Edges & Flutes | Visible edge condition and the relevant ground flute features |
| Shank & Finish | Specified shank dimensions and applicable coating or surface finish |
| Order Identification | Model, size, quantity, marking and agreed packaging |
Learn more about our manufacturing and quality process.
Product FAQs
What are these center drills used for?
They are used to prepare a center hole for work held between centers or to establish a starting location before a subsequent drilling operation. Confirm that the selected end geometry matches the required hole form.
Which sizes are shown in the dimension chart?
Seven cutting diameters d are listed: 1.5, 2, 2.5, 3, 4, 5 and 6 mm. Their matching shank diameters d1 are 4–14 mm, overall lengths L are 36.5–70 mm and listed L1 dimensions are 2–8 mm. Select all four dimensions from the same size row.
What do the 60° and 120° markings mean?
The drawing marks a 60° feature at one end and a 120° feature at the other. Confirm the required end profile and center-hole standard for your part drawing; the angle markings alone do not define a complete standard designation.
Does L1 equal the finished center-hole depth?
No. The chart labels L1 as flute length, while the drawing locates it at the short pilot end. It is a tool dimension, not a guaranteed finished-hole depth. Confirm the required depth and tool geometry before machining.
Is the cobalt content or TiN coating thickness specified?
The product title identifies M35 cobalt HSS and TiN coating, but the supplied dimension chart does not state cobalt percentage, coating thickness, hardness or tolerances. Request those values for the exact model if your purchase specification requires them.
What speeds and feeds should I use?
The chart does not provide cutting data. Select a starting cutting speed and feed for the active cutting end, workpiece grade and hardness, holder rigidity and coolant setup. Protect the small pilot from excessive feed and validate the settings with a trial cut.
Ordering & OEM FAQs
What information is needed for a quotation?
Send the requested size d, quantity, workpiece grade, required center-hole form and drawing. Specify the 60° or 120° end, shank and overall dimensions, and any coating, tolerance or packaging requirements.
Can the dimensions or branding be customized?
Share the required cutting and shank diameters, overall length, pilot geometry, coating and marking or packaging details. Feasibility and tolerances should be confirmed against an approved drawing.
Can I combine several sizes in one order?
Yes, send a size-by-size quantity list for a mixed-size quotation. Availability, minimum quantity and dispatch time can be confirmed for each requested configuration.
Downloads & Technical Reference
For general calculations and starting references, see the HSS cutting tools speeds & feeds guide. Confirm tool-specific settings for the selected center drill and workpiece.
Need Sizes, Pricing or Custom Options?
Send us the required tool type, sizes, quantities, workpiece material and any OEM or custom requirements. We will confirm suitable specifications, availability, lead time and quotation details.
Drawings, size lists and reference photos are welcome.
