The Dormer Pramet A400 M8 HSS Straight Shank Subland 90 Degree Standard Length drill (DIN 8374) is purpose-built for clean, accurate clearance holes in metric assemblies. Featuring a carefully engineered 118-degree pilot and a 90-degree chamfer, this drill is designed to create chamfered clearance holes for standard M8 threads with consistent depth and precision—reducing the need for rework and improving tapping reliability.

Precision-engineered for reliable clearance drilling

• 118° pilot point ensures precise centering and smooth entry, minimizing wandering on tough or misaligned workpieces.
• 90° chamfer is purposefully formed to generate the chamfered clearance hole required for standard metric threads, promoting accurate thread engagement and smoother fastener seating.
• Steam-oxide finish helps prevent workpiece material from sticking to the cutting edge, improving chip flow and reducing built-up edge during prolonged operations.
• Specific pilot diameter and length are calibrated to achieve the correct clearance drilling diameter and controlled depth, ensuring you hit the right notch for reliable tapping and consistent hole quality.
• Premium HSS material delivers robust performance across a range of substrates—from steel and stainless steel to aluminum—providing durability and long life in everyday shop conditions.
• Straight shank (X4D, standard length) compatibility with a wide array of CNC and conventional machines, offering straightforward tool changes and dependable rigidity in drilling operations.
• Subland geometry supports controlled drilling depth, simplifying hole preparation for threaded assemblies and minimizing scrap.

Who benefits most

Machinists, job shops, and maintenance teams who frequently prepare clearance holes for M8 threaded fasteners will appreciate the dependable accuracy and repeatable results this drill delivers. It’s especially valuable when you need to streamline tapping workflows by ensuring the clearance hole is correctly sized and properly chamfered on a consistent basis.

How this drill helps you work smarter

• Eliminates guesswork by combining a precise pilot with a deliberate chamfer, reducing misalignment and improving first-pass hole quality.
• Improves tapping success rates by providing the exact clearance diameter and depth needed for standard M8 threads.
• Versatile across machines—whether you’re running CNC programs or manual setups, the straight shank accommodates a broad range of tool holders and collet systems.
• Steam-oxide finish enhances chatter resistance and easing of chip evacuation, leading to smoother operations in materials that tend to gum up tools.

In practice, this drill shines in production environments where precision clearance holes for metric threads are routine—think robotics assemblies, electrical enclosures, or machinery frames—where repeatability and clean entry reduce cycle times and improve overall part quality.

Tip for best results: Match spindle speeds and feeds to the material being drilled, use proper coolant or lubrication, and deburr the hole after drilling to ensure optimal thread engagement and a clean finished surface.