Drill bit set Rittal 4050.812 — centering drills, M4 thread support, for aluminium/plastic/stainless steel/steel, 3 pcs

Rittal 4050.812 is a set of three centering drill bits designed to provide reliable hole starts and correct thread alignment for M4 applications. These centering drills are suitable for use in aluminium, plastic, stainless steel and steel, and are intended for tasks such as metalworking, panel fabrication and enclosure assembly where precise positioning and clean thread entry are important.

Advantages

The set contains three centering drills engineered to establish accurate pilot points that reduce wandering and improve subsequent tapping quality. Their geometry supports M4 thread starts, helping to ensure consistent engagement of taps and threaded fasteners. Compatibility with a range of materials — from softer plastics and aluminium to harder stainless steel and steel — makes this set versatile for workshop and production environments.

Suitable for

• Preparing accurate pilot holes for M4 threaded fasteners
• Panel fabrication and assembly of enclosures and housings
• General metalworking where centered hole starts are required
• Drilling starting points in plastic components to prevent cracking

When it may not be suitable

This centering drill set is specifically geared toward establishing pilot points and supporting M4 thread starts; it is not a complete tapping kit and does not include taps or thread-cutting tools. It may not be appropriate for applications requiring larger or smaller thread sizes, non-M4 thread profiles, or specialized coatings or geometries for very high-speed machining or abrasive materials.

Key specifications

• Tool type: centering drill bits (pilot drills)
• Number of pieces: 3
• Supported thread size: M4 (for thread start support)
• Suitable materials: aluminium, plastic, stainless steel, steel

How to use

Clamp the workpiece securely and mark the intended hole position. Fit a centering drill from the set in the drill chuck or collet, ensuring correct concentric mounting. Use low to moderate spindle speed and steady feed to create a small, accurately centered pilot point. Once the pilot point is established, remove the centering drill and proceed with the appropriate drill or tap for the final hole and thread cutting. For plastics, use reduced speed and gentle feed to avoid melting or chipping.

What to consider before purchase

• Intended thread size: set supports M4 thread starts only
• Material compatibility: suited for aluminium, plastic, stainless steel and steel
• Set contents: contains three centering drill bits; taps are not included
• Machine and chuck compatibility: verify shank diameter and chuck type fit your drill or machine

Usage recommendations

Use appropriate cutting fluid when working with steel or stainless steel to extend tool life and improve finish. Start at low speed when centering in plastic or thin-walled materials to prevent deformation. Inspect pilot points for wear and replace centering drills when accuracy degrades to maintain consistent thread starts.