Centering Drill Bit Set Rittal 4050.813 – centering drill bits for M5, 3 pieces, for aluminium, plastic, stainless steel, steel

Rittal 4050.813 is a set of three centering drill bits designed to create precise pilot holes and accurate starts for threading M5. Made for use on aluminium, plastic, stainless steel and steel, this kit helps establish correct hole position and alignment before tapping. The small-diameter centering geometry reduces wandering and improves the consistency of subsequent threading operations, making it suitable for preparation work in metalworking and fabrication contexts.

Advantages

The set contains three centering drills sized for M5 threads, providing consistent hole centering and simplified setup for tapping operations. Their geometry is optimized to prevent slipping on flat or curved surfaces, which reduces the need for additional marking or spotting. Because they are specified for a range of materials — aluminium, plastic, stainless steel and steel — the drills are versatile for mixed-material workshop tasks.

Suitable for

• Preparing pilot holes for M5 threading in sheet metal and components
• Spot drilling on aluminium and plastic parts prior to tapping
• Use in light fabrication, repair and assembly work involving stainless steel and steel
• Applications where accurate hole position and repeatable thread starts are required

When it may not be suitable

This centering drill set is intended for starting and guiding taps for M5 threads and is not a substitute for full-size drilling or reaming operations. It is not designed for use as a final-diameter drill for through-holes or where larger hole diameters are required. For extremely hard or hardened tool steels, specialized drills or different cutting geometries may be necessary.

Key specifications

• Application: centering/spot drilling to start M5 threading
• Material compatibility: aluminium, plastic, stainless steel, steel
• Quantity: 3 pieces per set
• Purpose: improve thread start accuracy and prevent tap wandering

How to use

Secure the workpiece and mark the intended hole location. Use the centering drill in a drill press or handheld drill at appropriate speed for the material, applying steady, moderate feed until the center hole is formed. Remove chips and verify the center before switching to the M5 tap. When tapping, align the tap with the starting hole and proceed with standard tapping technique, using cutting fluid as appropriate for the material.

What to consider before purchase

• Verify that you need centering/spotting drills specifically sized for M5 thread starts
• Confirm compatibility with the materials you will work on (aluminium, plastic, stainless steel, steel)
• Consider whether three pieces meet your workshop usage frequency and backup needs
• Ensure your drilling equipment can hold small-diameter bits securely

Usage recommendations

Use appropriate speeds and cutting fluids for each material: lower speeds and suitable lubrication for stainless steel and steels, higher speeds for aluminium and plastics. Inspect drill tips for wear and replace the set when centering accuracy declines to maintain consistent thread quality.