Cobalt HSS Drill Bits for Stainless Steel
DIN standard M35 cobalt HSS twist drills provide heat resistance, stable cutting, efficient chip evacuation, and clean, accurate holes when machining stainless steel, alloy steel, cast iron, and non-ferrous metals.
⚙️ Core Specifications
*Materiale: M35 cobalt high-speed steel (5% cobalt)
*Standard: DIN standard
*Point Angle: 118° standard / 135° split point optional
*Tipo di flauto: Precision-ground spiral flutes
*Tipo di gambo: Straight cylindrical shank
*Finish Options: Bright finish / black oxide / TiN coating optional
*Gamma di diametri: Standard metric sizes and customized combinations
*Materiali di applicazione: Stainless steel / alloy steel / carbon steel / cast iron
*Supply Options: Individual drills / assorted drill sets
*OEM/ODM: Custom sizes, set combinations, coatings, marking, and packaging available
Qualità costante
Consistent geometry across repeat orders.
Ordini flessibili
Small batches and mixed sizes available.
OEM Support
Custom marking, labels and packaging.
Standard e personalizzati
Standard sizes and custom configurations.
Panoramica del prodotto
Il DIN Standard Cobalt HSS Twist Drill for Stainless Steel is a jobber-length, straight-shank drilling tool designed for repeatable professional metalworking. Its DIN 338 dimensional format makes diameter and length selection straightforward, while M35 high-speed steel with approximately 5% cobalt provides better hot hardness and wear resistance than conventional general-purpose HSS when cutting stainless steel and other demanding metals.
Fully ground flutes provide accurate geometry and a smooth chip path. A 135° split-point option helps reduce drill walking and cutting pressure, while a regular point is available for general drilling requirements. For additional materials, coatings, and HSS grades, compare the M2/M35/M42 coated HSS twist drill series.
HSS drill family reference. Rolled, fully ground, bright, black-oxide, titanium-coated, straight-shank, taper-shank, center-drill, and spot-drill formats are shown. The ordered cobalt twist-drill construction and finish should be confirmed by model.
Why M35 Cobalt HSS for Stainless Steel?
Point Geometry & Ground Construction
DIN 338 Size & Length Chart
Reference dimensions in millimeters. Diameter groups share the same nominal flute and overall length.
| Diameter D (mm) | Flute Length l (mm) | Overall Length L (mm) |
|---|---|---|
| 0.4 | 5 | 20 |
| 0.5 | 6 | 22 |
| 0.6 | 7 | 24 |
| 0.7 | 8 | 28 |
| 0.8 | 10 | 30 |
| 0.9 | 11 | 32 |
| 1.0 | 12 | 34 |
| 1.1 | 14 | 35 |
| 1.2 | 18 | 38 |
| 1.3 | 16 | 38 |
| 1.4 | 18 | 40 |
| 1.5 | 20 | 40 |
| 1.6-1.7 | 20 | 43 |
| 1.8-1.9 | 22 | 46 |
| 2.0-2..1 | 24 | 49 |
| 2.2-2.3 | 27 | 53 |
| 2.4-2.6 | 30 | 57 |
| 2.7-3.0 | 33 | 61 |
| 3.1-3.3 | 36 | 65 |
| 3.4-3.7 | 39 | 70 |
| 3.8-4.2 | 43 | 75 |
| 4.3-4.7 | 47 | 80 |
| 4.8-5.3 | 52 | 86 |
| 5.4-5.0 | 57 | 93 |
| 6.1-6.7 | 63 | 101 |
| 6.8-7.5 | 69 | 109 |
| 7.6-8.5 | 75 | 117 |
| 8.6-9.5 | 81 | 125 |
| 9.6-10.6 | 87 | 133 |
| 10.7-10.8 | 94 | 142 |
| 11.9-13.2 | 101 | 151 |
| 13.3-14.0 | 108 | 160 |
Stainless-Steel Drilling Recommendations
Quick Troubleshooting Guide
| Observed Condition | Items to Check |
|---|---|
| Drill walks at entry | Use the split-point option, shorten overhang, improve spot location, and verify runout. |
| Squealing, rubbing, or rapid work hardening | Avoid dwell, review feed, reduce excessive speed, and ensure the cutting edge is sharp. |
| Blue chips or excessive heat | Reduce cutting speed and improve cutting-fluid delivery and chip removal. |
| Chipped lips or drill breakage | Check workholding, runout, interrupted entry, excessive feed, and chip packing. |
| Oversize or tapered hole | Inspect point symmetry, holder condition, spindle alignment, and tool wear. |
Related Drilling Options
Select the drill according to workpiece material, required diameter, depth, machine power, holder, and production volume. Holder condition is part of the cutting system; see why tooling should be evaluated as a complete system.
CENTER DRILLTiN-Coated M35 Cobalt HSS Center DrillFor centering and starting operations before drilling.View product
TAPER SHANKM2 HSS Morse-Taper Twist DrillFor larger-diameter drilling with a Morse-taper spindle.View product
CARBIDE UPGRADESolid Carbide Twist Drill for Stainless SteelFor rigid CNC setups and higher-production applications.View product
Size Chart & Specifications
The supplied chart lists 32 diameter entries from 0.4 mm to a listed upper band of 13.3–14.0 mm. For each entry, it gives overall length L and flute length l. All values below are in millimeters. Match the requested diameter to its length entry, then confirm the exact cobalt HSS grade, point geometry, coating and shank dimensions for the ordered model.
| Diameter D (mm) | Overall L (mm) | Flute l (mm) | Diameter D (mm) | Overall L (mm) | Flute l (mm) |
|---|---|---|---|---|---|
| 0.4 | 20 | 5 | 2.4–2.6 | 57 | 30 |
| 0.5 | 22 | 6 | 2.7–3.0 | 61 | 33 |
| 0.6 | 24 | 7 | 3.1–3.3 | 65 | 36 |
| 0.7 | 28 | 8 | 3.4–3.7 | 70 | 39 |
| 0.8 | 30 | 10 | 3.8–4.2 | 75 | 43 |
| 0.9 | 32 | 11 | 4.3–4.7 | 80 | 47 |
| 1.0 | 34 | 12 | 4.8–5.3 | 86 | 52 |
| 1.1 | 35 | 14 | 5.4–5.0 | 93 | 57 |
| 1.2 | 38 | 18 | 6.1–6.7 | 101 | 63 |
| 1.3 | 38 | 16 | 6.8–7.5 | 109 | 69 |
| 1.4 | 40 | 18 | 7.6–8.5 | 117 | 75 |
| 1.5 | 40 | 20 | 8.6–9.5 | 125 | 81 |
| 1.6–1.7 | 43 | 20 | 9.6–10.6 | 133 | 87 |
| 1.8–1.9 | 46 | 22 | 10.7–10.8 | 142 | 94 |
| 2.0–2.1 | 49 | 24 | 11.9–13.2 | 151 | 101 |
| 2.2–2.3 | 53 | 27 | 13.3–14.0 | 160 | 108 |
Specification confirmation: The chart does not state the exact cobalt HSS grade or cobalt content, point angle, coating, shank diameter, manufacturing standard or tolerances. Confirm these for the ordered model; stainless steel suitability depends on the workpiece and cutting conditions.
HSS Drill Speeds & Feed Settings
Select starting cutting data for the confirmed cobalt HSS grade, point geometry, workpiece stainless grade and hardness, hole depth and coolant supply. The dimension chart does not provide speed or feed recommendations.
Setting Speed & Feed
Spindle speed: n = (1000 × Vc) / (π × D), where n is RPM, Vc is cutting speed in m/min and D is drill diameter 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 0.10 mm/rev, programmed feed is 50 mm/min. This illustrates the formula only; these values are not a recommendation for a specific material.
For additional reference, see our HSS cutting tools speeds & feeds guide. Confirm tool-specific values for the selected cobalt HSS drill and stainless steel grade.
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.
Opzioni di personalizzazione
| Parametro | Information to Confirm |
|---|---|
| Drill Type | Twist drill, center drill, extra-long drill or application-specific design |
| Materiale dell'utensile | 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 |
| Finitura superficiale | 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
| Caratteristica | Check Against the Confirmed Specification |
|---|---|
| Diametro di taglio | 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
Are these cobalt HSS drills suitable for every stainless steel grade?
The range is intended for stainless steel drilling, but the appropriate drill configuration and cutting data depend on the stainless grade, hardness, hole depth, machine rigidity and coolant. Provide those details when requesting a recommendation.
Which diameters and lengths are listed?
The size chart contains 32 entries, starting at Ø0.4 mm and ending with the listed Ø13.3–14.0 mm band. Overall lengths range from 20 to 160 mm, and flute lengths from 5 to 108 mm. Diameter bands group length dimensions; confirm the exact diameter and availability before ordering.
What cobalt percentage, point angle and coating do the drills have?
The supplied dimension chart does not specify an HSS grade, cobalt percentage, point angle or coating. Confirm the configuration for the exact model in the quotation or product drawing.
Does flute length equal the maximum drilling depth?
No. Flute length is a physical tool dimension. Usable drilling depth also depends on the drill point, chip clearance, workholding and whether the hole is blind or through. Confirm the required hole depth before selecting a length.
What speeds and feeds should I use for stainless steel?
The dimension chart does not contain cutting data. Select a starting cutting speed and feed per revolution for the confirmed drill geometry, stainless grade, hole depth and coolant setup. Keep the cutting edge engaged, provide suitable coolant and validate the settings with a trial hole.
Are all diameter ranges in the supplied chart confirmed?
Three entries need confirmation: the chart prints “5.4–5.0” and “10.7–10.8” in the diameter column, and lists a longer flute for Ø1.2 mm than for Ø1.3 mm. These values are reproduced in Specifications as shown; request confirmation before using the affected sizes in an order.
Ordering & OEM FAQs
Cosa devo fornire per ottenere un preventivo?
Send the exact drill diameter, quantity, stainless steel grade, hole depth and whether the hole is blind or through. Include any required HSS grade, point geometry, coating, shank dimensions, tolerance, packaging or drawing.
Can the drill dimensions or branding be customized?
Share the required diameter, flute and overall lengths, shank specification, point geometry and branding requirements for a feasibility review. The available options and tolerances should be confirmed in the quotation or approved drawing.
Can I order multiple sizes together?
Provide a size-by-size quantity list for a mixed-size quotation. Availability, minimum quantity and lead time can then be confirmed for each requested diameter and configuration.
Downloads & Technical Reference
For general calculations and starting references, see the HSS cutting tools speeds & feeds guide. Confirm tool-specific cutting data for the ordered drill and stainless steel grade.
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.
