Recommended
Magnet drills with variable speed, so the correct RPM can be set for each operation.
Versadrive Multisink Technical Guide & FAQ
Multisink Technical Guide
The Multisink is HMT's combination countersinking tool, designed for use with a magnet drill or drill press. Use it as a piloted countersink, or with Versadrive holecutters, drill bits, taps, drill taps and reamers to countersink in the same operation. This guide covers machines, materials, pilots, lubrication, specifications, best practice and recommended RPM.
TCT Multisink (uncoated) and ULTRA Multisink (coated carbide), in 82° and 90° point angles, for holes from 5/8" diameter. Standard 3/4" Weldon shank, suitable for use with any variable speed magnet drill.
Which Machine Should I Use?
Can also be used with
Drill presses and radial arm drills.
Tapping
To tap and countersink, or drill, tap and countersink, the machine must have variable speed and reverse.
Which Materials Can the Multisink Be Used On?
Structural Steel
TCT or ULTRA Multisink. See the RPM table for steels up to 500 MPa and up to 1000 MPa.
Wear Plate and Hardox
Drill the hole first with Carbidemax ULTRA cutters, then countersink separately with the ULTRA Multisink and the matching pilot.
Stainless Steel
Run at the reduced stainless steel speeds in the RPM table.
When Do I Need a Pilot?
Always fit a pilot of the matching diameter when countersinking a pre-drilled hole. It protects the tips, centers the tool and prevents chatter. Fractional pilots, 5/8" to 15/16" › · Metric pilots, 16 to 26 mm ›
Which Lubricant Should I Use?
Speedlube
The best all-purpose choice. Fast aerosol application covers the inside of the hole as well as the tool. Shop Speedlube ›
BioCut Paste
Dip the tool straight into the tin. Minimizes run-off and mess on painted or sensitive surfaces, and suits overhead work. Shop BioCut Paste ›
BioCut Blue
Works particularly well on harder materials and difficult applications. Apply directly to the tool and into the hole on flat surfaces. Shop BioCut Blue ›
Multisink Specifications
All Multisinks have a standard 3/4" (19.05 mm) Weldon shank, suitable for use with any variable speed magnet drill.
| Part no. | Countersink diameter | d2 | Length | Point angle | Shank |
|---|---|---|---|---|---|
| 601055-0400 | 40 mm | 14 mm | 100 mm | 90° | 3/4" Weldon |
| 601055-0550 | 55 mm | 14 mm | 109 mm | 90° | 3/4" Weldon |
| Part no. | Version | Countersink diameter |
|---|---|---|
| 601057-0010 | TCT | 1-1/2" |
| 601057-0020 | TCT | 2-11/64" |
| 601058-0010 | ULTRA | 1-1/2" |
| 601058-0020 | ULTRA | 2-1/4" |
| Range | Sizes | Part nos. |
|---|---|---|
| Fractional | 5/8", 11/16", 3/4", 13/16", 7/8", 15/16" | 601051-0015 to 601051-0040 |
| Metric | 16, 18, 20, 22, 24, 26 mm (length 52 mm) | 601050-0160 to 601050-0260 |
Best Practice & FAQ
What is best practice for long tool life?
- Set the correct RPM for each operation. The wrong RPM leads to poor tool life or breakage.
- Apply firm, steady feed pressure throughout the cut.
- Avoid lateral movement or tilting, which can damage the tool.
- Apply quality cutting lubricant regularly, especially in thick or hardened material.
- Make sure the surface is clean and the steel is thick enough for a strong magnet hold.
- Use the highest available gear for maximum torque.
Is my magnet drill suitable for the Multisink?
Use a variable speed magnet drill, or another drilling machine, with the torque and speed range for countersinking. Change the RPM for each separate operation rather than leaving it at one speed. To tap and countersink in one operation, the drill must also be reversible.
Why have the tips of my Multisink been damaged?
When you only countersink a pre-drilled hole, always fit the pilot of the matching diameter. The pilot protects the tips, centers the tool in the hole, improves cutting and prevents chatter.
Can I drill and countersink Hardox and wear plate steels?
Wear plate such as Hardox is extremely hard and needs maximum rigidity, with the shortest possible distance between spindle and workpiece. Drill the holes first with Carbidemax ULTRA coated TCT cutters, then countersink separately with the ULTRA coated Multisink and the matching pilot.
Can I countersink laser-cut or flame-cut holes?
Laser-cut and flame-cut holes are often not perfectly round and can have rough edges, so the pilot may not fit. Ream the holes first to make them round and remove the surface hardness, then countersink with the Multisink and the matching pilot.
Why has my Multisink gone blunt?
Early blunting is usually caused by running too high an RPM for the application. At the recommended RPM and torque, and following the best practice on this page, you should get excellent tool life.
Which lubricant should I use?
See Lubrication above.
How do I get technical support or make a warranty claim?
Visit Product Support for support and warranty claim forms. Give as much of the requested information as you can and our technical team will be in touch.
Recommended RPM for Countersinking
Guideline parameters only. Actual parameters may vary with operating conditions. Multisink sizes are 40 mm and 55 mm (90°), and 1-1/2", 2-11/64" and 2-1/4" (82°).
| Countersink diameter | Structural steel up to 500 MPa (73 ksi) | Structural steel up to 1000 MPa (145 ksi) | Stainless steel | Aluminum | Gray cast iron | Plastics |
|---|---|---|---|---|---|---|
| 6.3 mm (1/4") | 765 | 505 | 265 | 1250 | 500 | 850 |
| 10.4 mm | 460 | 300 | 145 | 765 | 315 | 530 |
| 12.4 mm (1/2") | 385 | 255 | 110 | 635 | 265 | 480 |
| 16.5 mm | 295 | 185 | 80 | 485 | 210 | 345 |
| 20.5 mm (13/16") | 230 | 155 | 50 | 385 | 165 | 280 |
| 25 mm (1") | 185 | 130 | 50 | 315 | 130 | 225 |
| 30 mm | 155 | 105 | 35 | 265 | 105 | 185 |
| 40 mm | 120 | 80 | 30 | 205 | 80 | 140 |
| 55 mm | 95 | 60 | 25 | 145 | 70 | 120 |
| 63 mm | 80 | 55 | 20 | 130 | 55 | 90 |
| 80 mm | 65 | 40 | 20 | 100 | 45 | 75 |
Technical guidance prepared by Holemaker Technology. Last reviewed: November 2026.