Double-Ended HSS Center Drills – Fully Ground
Fully ground, double-ended HSS center drills for center-hole preparation and controlled hole starting. Seven listed item codes cover pilot diameters d from 1.0 to 5.0 mm, with size-specific body diameters D, cutting lengths l and overall lengths L.
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.
Double-Ended HSS Center Drills – Fully Ground Overview
These fully ground, double-ended HSS center drills are designed to prepare center holes and establish a controlled start for subsequent drilling. The supplied chart lists seven item codes with pilot diameter d from 1.0 to 5.0 mm, body diameter D from 4 to 11 mm, cutting length l from 1.0 to 5.5 mm and overall length L from 34 to 70 mm. Choose the complete size row for the holder and required hole form, and confirm the exact steel grade and cutting geometry for the ordered item.
Key Configuration
The product drawing shows a pilot and tapered cutting feature at both ends. Protect the inactive end during clamping.
Select the listed cutting length l and overall length L for the required access and setup.
The original product description identifies a fully ground design; confirm the exact geometry and finish for the item code.
Key Product Advantages
Center-Hole Preparation
Creates a starting feature for compatible centering operations.
Two Cutting Ends
Allows use of the second end when the tool remains serviceable.
Seven Item Codes
Each code has its own d, D, l and L dimensions.
HSS Construction
Confirm the precise HSS grade for your workpiece and order.
Centering Applications
Use a suitable center drill to prepare center holes on a lathe or to establish a starting location before subsequent drilling on a CNC machine or drill press. Choose the tool by workpiece material, hole geometry, holder fit and machine rigidity.
Workpiece Material Selection
The supplied sheet labels a 50 series for general-purpose cutting and a 60 series for higher-speed cutting, and illustrates carbon steel, alloy steel, cast iron, copper alloy and tool steel material groups. It does not map an individual item code to a series or specify the exact HSS grade. Confirm the ordered series and cutting data for the workpiece.
Product Details & Available Configurations
All five images below are retained from the original product page. Some may show related configurations; use the seven-row chart in Specifications for the dimensions of this listed series.
Confirm the HSS grade, finish and end geometry for the quoted item; product images alone do not establish these specifications.
Size Chart & Specifications
The supplied chart lists seven item codes. Pilot diameter d runs from 1.0 to 5.0 mm, body diameter D from 4 to 11 mm, cutting length l from 1.0 to 5.5 mm and overall length L from 34 to 70 mm. All dimensions below are in millimeters. Match the item code and complete row to your holder and required center-hole feature.
| Item Code | Pilot Dia. d (mm) | Body Dia. D (mm) | Cutting Length l (mm) | Overall L (mm) |
|---|---|---|---|---|
| 04D0010 | 1.0 | 4 | 1.0 | 34 |
| 05D0015 | 1.5 | 5 | 1.5 | 40 |
| 06D0020 | 2.0 | 6 | 2.0 | 45 |
| 07D0025 | 2.5 | 7 | 2.5 | 50 |
| 08D0030 | 3.0 | 8 | 3.0 | 50 |
| 10D0040 | 4.0 | 10 | 4.5 | 60 |
| 11D0050 | 5.0 | 11 | 5.5 | 70 |
Series confirmation: The sheet describes 50 and 60 series and gives broad material examples, but the seven item codes are not individually assigned to either series. Confirm the series, cutting geometry and applicable workpiece before ordering.
HSS Center Drill Speeds & Feed Settings
The size chart does not provide speed or feed values. Select starting cutting data using the confirmed series, active cutting diameter, HSS grade, workpiece grade and hardness, holder rigidity and coolant supply.
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 active pilot 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 0.02 mm/rev, programmed feed is 10 mm/min. This demonstrates the formula only; it is not a recommendation for a specific workpiece.
For general starting references, see our HSS cutting tools speeds & feeds guide. Confirm tool-specific values for the selected 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 double-ended center drills used for?
They prepare center holes for work held between centers or establish a starting location before a subsequent drilling operation. Confirm that the end geometry matches the required center-hole form.
Which sizes and item codes are listed?
The chart lists seven codes: 04D0010, 05D0015, 06D0020, 07D0025, 08D0030, 10D0040 and 11D0050. Pilot diameter d is 1.0–5.0 mm, body diameter D is 4–11 mm, cutting length l is 1.0–5.5 mm and overall length L is 34–70 mm. Select all dimensions from the same row.
How do the two cutting ends help?
The design provides a cutting feature at each end. The second end may be used if it remains serviceable; protect the inactive end in the holder and confirm adequate grip and clearance.
What do d, D, l and L mean?
In the supplied drawing, d is the pilot diameter, D is the larger body or clamping diameter, l is the short cutting length and L is the overall length. Cutting length l is a tool dimension, not a guaranteed finished center-hole depth.
What is the difference between the 50 and 60 series?
The supplied sheet labels the 50 series for general-purpose cutting and the 60 series for higher-speed cutting. It does not assign the seven item codes to a particular series. Confirm the ordered series, HSS grade and workpiece suitability before purchase.
What cutting speed and feed should I use?
The size chart does not give speed or feed values. Choose starting conditions for the confirmed series, pilot diameter, HSS grade, workpiece material and hardness, coolant and machine rigidity. Avoid overloading the short pilot and validate settings with a trial cut.
Ordering & OEM FAQs
What should I provide for a quotation?
Send the item code or d, D, l and L dimensions, quantity, workpiece grade and required center-hole form. Include the requested 50 or 60 series, HSS grade, point geometry, finish, tolerance or drawing if specified.
Can I request custom dimensions or OEM marking?
Share your required pilot and body diameters, cutting and overall lengths, center-hole geometry, material, finish and marking or packaging requirements. Available options and tolerances should be confirmed against an approved drawing.
Can I combine several item codes in one quotation?
Yes. Send a code-by-code quantity list. Availability, minimum quantity and dispatch time can then be confirmed for each requested specification.
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, series 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.
