The Bernardo MD 4055 fixed-speed magnetic drilling machine offers core drilling capacities up to Ø 40 mm with a maximum depth of 50 mm, twist drill capacity up to Ø 13 mm, drill head stroke of 135 mm, no-load speed of 480 rpm, a universal 19 mm Weldon shank for standard core drills, automatic internal lubrication with integrated tank, electromagnet with an adhesive force of 10,500 N, and an 1150 W 230V single-phase motor. Weight 12.7 kg, machine dimensions 240 × 255 × 500 mm. Suitable for metalworking, machine construction, automotive sector, construction sites, and workshops. Manufactured in Austria, distributed in Italy by Krollit as an official Bernardo distributor since 2007.
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Core drilling capacity: Ø 40 mm × 50 mm depth
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Max twist drill: Ø 13 mm
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Head stroke: 135 mm
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Spindle speed: 480 rpm
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Magnet adhesive force: 10,500 N
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Motor: 1150 W – 230V single-phase
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Weight: approx. 12.7 kg
Who uses the MD 4055 and for what
The Bernardo MD 4055 is a portable magnetic drilling machine designed for mechanical workshops, metal fabricators, and construction sites. Fixed speed 480 rpm: simple and reliable configuration for standard use on typical materials and diameters. For workshops that primarily work with structural steel using standard core drills, the fixed speed is correctly sized, avoiding the electronic complexity and cost of an inverter. The electromagnet with 10,500 N adhesive force ensures secure fastening on steel structures even in vertical or overhead positions, with a safety belt/chain included as standard. The automatic internal lubrication system delivers coolant directly to the tool through the spindle, significantly extending the life of core drills (expensive consumables) and improving hole quality. Its 12.7 kg weight and compact dimensions (240 × 255 × 500 mm) make it portable to construction sites in a case or plastic container, without the need for pallet jacks or cranes. Among Krollit's customers, the MD 4055 is chosen by metal fabrication workshops, automotive workshops, steel structure manufacturers, industrial maintenance technicians, and site installers.
Its place in the Bernardo range
The Bernardo range of magnetic drilling machines is organized by core drilling capacity (max diameter and depth) and drive type. The range includes 10 models divided into 3 families:
E Family (fixed speed): MD 3550 E (Ø 35 mm), MD 3850 (Ø 38 mm), MD 4055 (Ø 40 mm), MD 5050 E (Ø 50 mm). Suitable for workshops with repetitive standard work on known materials.
VD Family (Variable Digital Speed): MD 3550 VD (Ø 35 mm), MD 5050 VD (Ø 50 mm), MD 6050 VD (Ø 60 mm), MD 9875 VD (Ø 98 mm). Continuously adjustable speed for material adaptation, suitable for workshops with a variety of operations.
M Family (multi-gear/multifunction): MD 5075 with 2 gears (Ø 50 mm × 75 mm depth), TPC 1000 multifunction with tapping up to M18.
The MD 4055 is sized for workshops with standard daily use. For workshops that alternate different materials (mild steels, hardened steels, aluminum), the corresponding VD version offers greater flexibility: for the MD 4055, the equivalent VD is the superior VD range. The advantage of the E version lies in its simple construction (fewer electronic components) and lower cost.
Krollit logistics and support
Bernardo shipping in 5-9 working days (7 days to the South). Weighing 12.7 kg, it is shipped in a case/plastic container and can be easily handled by one person, even on site. Weldon 19 mm core drills, mandrels, adapters, and original Bernardo spare parts are available from stock with 3-5 working days shipping. Customer support in Italian is available.
Who the MD 4055 is for
| Profile |
Compatibility |
Reason |
| Passionate hobbyist |
Suitable |
Semi-professional machine for occasional use on steel structures. Works on 230V single-phase domestic power, 12.7 kg weight manageable by one person. |
| Metal fabricator with daily use |
Recommended |
Ø 40 mm capacity and fixed speed 480 rpm sized for standard structural steels. Reliability of a simple configuration without complex electronic components. |
| Site installer |
Recommended |
12.7 kg weight and compact dimensions (240 × 255 × 500 mm) make it transportable. 10,500 N magnet force for secure fastening on vertical structures. |
Not suitable for: core drilling beyond Ø 40 mm (upgrade to MD 5050, MD 5075, MD 6050 VD or MD 9875 VD models); deep core drilling beyond 50 mm (the MD 5075 with 75 mm depth or MD 9875 VD with 75 mm depth are correctly sized); workshops with a variety of materials requiring different speeds (the corresponding VD version offers greater flexibility); non-magnetic structures (aluminum, non-magnetic stainless steel): the electromagnet does not adhere; continuous industrial use at high frequency (magnetic drills are designed for intermittent use).
Working capacity
| Specification |
Value |
| Max core drilling diameter |
Ø 40 mm |
| Max core drilling depth |
50 mm |
| Max twist drill diameter |
Ø 13 mm |
| Drill head stroke |
135 mm |
Speed and tool holder
| Specification |
Value |
| Spindle speed |
480 rpm |
| Weldon shank |
19 mm |
| Distance Weldon - base |
140 mm |
Magnetic base
| Specification |
Value |
| Magnetic adhesive force |
10,500 N |
| Magnetic base dimensions |
159 × 79 × 48 mm |
Motor and power supply
| Specification |
Value |
| Motor power |
1150 W |
| Voltage |
230V |
| Power supply |
Single-phase |
Dimensions and weight
| Specification |
Value |
| Machine dimensions (L × W × H) |
240 × 255 × 500 mm |
| Weight |
approx. 12.7 kg |
Compliance
| Specification |
Value |
| Marking |
CE |
Standard equipment
- Bernardo MD 4055 magnetic drilling machine
- Plastic transport case
- Coolant tank
- Safety belt/chain for vertical and overhead use
- User manual in Italian
- Service tool set
Frequently Asked Questions
What materials does the MD 4055's electromagnet work on?
Only on magnetic ferrous materials: structural steel, iron, carbon steels. It does not work on aluminum, non-magnetic stainless steel, non-ferrous materials.
The electromagnet creates the magnetic field that attaches the machine to the structure: without ferrous material, attachment is impossible. For working on aluminum or non-magnetic stainless steel, fixed drill presses or dedicated mechanical fastening systems are required. For most standard metal structures (fabrication, frames, profiles), the electromagnet is the fastest and most reliable fastening system.
Can I use the drilling machine in a vertical or overhead position?
Yes. with the included safety belt/chain. The 10,500 N magnetic force is sized for fastening in any position, but safety always requires the additional mechanical restraint.
The electromagnet retains the machine even during a momentary power interruption for the seconds needed to prevent falls, but in the event of a prolonged interruption (torn cable, blackout), the safety belt/chain is the only reliable system. Standard safety procedures ALWAYS require mechanical restraint in addition to the electric magnet, regardless of the nominal adhesive force.
How does the automatic internal lubrication system work?
The coolant (oil-water emulsion or dedicated metalworking oil) starts from an integrated tank and is delivered directly to the center of the tool through an internal channel. It works in any position (even overhead) by gravity or pressure.
Internal lubrication significantly extends the life of core drills (expensive consumables) by reducing friction and dissipating heat. Without lubrication, drills last 30-50 holes; with internal lubrication, 100-200 holes. The coolant is not included and is available from standard industrial suppliers.
Is the 19 mm Weldon shank a universal standard?
Yes. The 19 mm Weldon shank is the international standard for core drills: most commercial drills (Karnasch, Magbohrer, Rotabroach, BDS, etc.) use this shank. All drills have a 19 mm Weldon pin for quick fastening via a lateral set screw.
For workshops with drills of other brands or standards, adapters can be used. For future investments, the 19 mm Weldon shank is the most common choice with the widest market offering. Original Bernardo drills come with a 19 mm Weldon shank and are available from stock with 3-5 working days shipping.
How much power does the motor consume during intermittent use?
The 1150 W motor typically consumes 1.1-1.3 kWh per effective hour of work. In intermittent artisanal use (1-2 minutes per hole, pauses between holes), the average consumption is 0.3-0.5 kWh/hour.
The motor only runs during hole cutting: it is off between holes. For workshops with significant electricity costs, consumption is negligible. The drilling machine is an electrically efficient machine: nominal power is only engaged during actual processing minutes. For intensive continuous use, a standard industrial meter is recommended.
