Designed for precision in metric assemblies, the Dormer Pramet A402 M4 HSS straight shank drill combines a dedicated 118° pilot with a 180° counterbore to deliver clean, accurate clearance holes for standard metric threads in a single, efficient pass. Built to DIN 8376 specifications, this is a purpose-built tool for machinists who demand consistency from job to job.

Key features and benefits

• 118° pilot with 180° counterbore: Enables accurate pilot alignment and a flush, recessed counterbore for bolt heads, ensuring reliable thread clearance when assembling metric fasteners.
• DIN 8376 compliance: The drill geometry is tuned to standardize hole diameter and depth for common metric thread installations, reducing guesswork and rework.
• Premium HSS material: High-speed steel provides robust performance across a range of materials, including steel, aluminum, and stainless steel, while maintaining good edge retention.
• Steam oxide finish: A coating designed to minimize workpiece sticking to the cutting edge, promoting smoother chip evacuation and longer tool life in challenging materials.
• Specific pilot diameter and depth: Precisely engineered to create the correct clearance drilling diameter and depth for standard threads, helping you achieve consistently threaded holes without oversize or undersize issues.
• Versatile and reliable: Suitable for both CNC and conventional machines, making it a dependable choice for batch production or prototype work alike.
• X4D standard length, straight shank: The 4xD flute length and straight shank provide rigidity, balanced cutting, and straightforward tool changes across your milling or drilling setups.

Ideal applications

• Creating counterbored clearance holes for M4 and other standard metric threads in steel, aluminum, or stainless components.
• Fixture work and assembly jigs where precise bolt head seating is critical for flush surfaces and consistent fastener installation.
• Shop environments that run both CNC milling centers and traditional drill presses, where one tool must perform reliably across formats.

Practical tips for best results

• Use appropriate cutting speed for the material being drilled; moderate speeds with steady feed help preserve the 118° pilot and prevent wandering on tougher alloys.
• Maintain good chip evacuation by ensuring adequate lubrication or coolant, especially when drilling stainless steel or high-strength alloys.
• Peck drilling in harder materials can prevent chip buildup in the counterbore region and extend tool life.
• Check hole depth against the intended bolt length to avoid over- or under-recessed counterbores that could compromise fastener seating.

With the Dormer Pramet A402 M4 HSS straight shank SUBLAND drill, you gain a dedicated solution that merges precise pilot entry, accurate counterbore depth, and durable performance into one reliable tool. This is the choice for workshop professionals who value repeatable results, reduced setup times, and superior fit for metric-thread assemblies.