The Dormer Pramet A400 M6 HSS straight shank subland drill with 90 degree standard length (DIN 8374) is engineered for precise chamfered clearance holes that perfectly suit standard metric threads. Built to perform across CNC and conventional machines, this drill blends exacting geometry with durable high-speed steel to deliver consistent, reliable results in a range of metals.

• 118° pilot and 90° chamfer — a specialized combination that starts the hole with a precise pilot and then creates a clean 90-degree chamfer, ideal for producing chamfered clearance holes for M6 and other standard metric threads. This minimizes thread damage and improves tapping success.
• Steam oxide finish — a robust coating that reduces friction and helps prevent material from sticking to the cutting edge, promoting smoother chip evacuation and longer tool life.
• Precisely tuned pilot diameter and length — designed to achieve the correct clearance drilling diameter and depth for standard threads, reducing the need for rework and ensuring downstream tapping or thread inserts seat accurately.
• Premium HSS material — high-speed steel provides good heat resistance and wear durability, making it suitable for drilling steel, aluminium, and stainless steel without frequent tool changes.
• Subland geometry with straight shank — stable cutting action with reduced wandering, and a straight shank that fits a wide range of standard tool holders for dependable performance in both new and older setups.
• Versatility for multiple setups — optimized for both CNC and conventional machines, enabling precise clearance holes and chamfers in one tool, saving time and reducing tool changes on mixed workflows.

Who benefits most: professional machinists, maintenance technicians, and shop floor operators who routinely prepare threaded assemblies or need clean chamfered clearance holes for metric fasteners. Whether you’re building enclosures, framing, automotive components, or machinery housings, this drill helps you move from hole creation to reliable threading with fewer steps.

Practical tips for best results: match cutting speeds and feeds to the material being drilled, use appropriate lubrication on harder metals to extend tool life, and begin with a conservative feed to establish the pilot before committing to full-depth chamfering. The DIN 8374 specification ensures compatibility with standard thread sizes, while the A400 M6 designation signals a precise fit for M6 clearance holes and related applications.