The Dormer Pramet A125 10.00 mm x 400 mm HSS straight shank drill is engineered for professionals who demand extended reach without sacrificing precision. This extra-long drill bit combines a robust 10.0 mm diameter with a full 400 mm flute length, giving you the capability to drill deep holes in hard-to-reach areas while maintaining clean, controlled cuts.

Key features that matter in real work

118° conventional point — a strong, self-centering point that starts cleanly and resists wandering. It also preserves grind life, making it easier to re-sharpen when needed, so you spend more time drilling and less time fussing with alignment.

Steam oxide finish — this finish reduces chip adhesion at the cutting edge, helping to minimize built-up edge and overheating. The result is steadier hole quality and less stopping to clear debris during long, continuous drilling sessions.

Extra-long length series — specifically designed for drilling very deep holes and for applications where increased reach is essential. The extended flute length provides ample clearance for long through-holes, deep pockets, and，当 you’re working with thick workpieces or assemblies with multiple layers.

Premium HSS material — high-speed steel offers dependable performance across a range of machine tools and materials. This drill can handle steel, aluminium, and stainless steel, making it a versatile choice for mixed-material projects without needing multiple drill bits.

Versatility in one drill — whether you’re using a drill press, CNC, or handheld power drill, this bit adapts to a broad spectrum of metalworking tasks. It delivers consistent hole quality in automotive, fabrication, and maintenance environments where accuracy and reach are critical.

Why this bit stands out in practice

For technicians who frequently encounter recessed chambers, long weld seams, or components with limited access, the A125 drill delivers reliable start-up and smooth chip evacuation. The 400 mm length reduces the need for adapters or extensions, simplifying setups and cutting down on setup time. Its compatibility with a wide range of metals—including steel, aluminium, and stainless steel—means you can standardize on a single high-performing bit for diverse jobs, reducing tool changes and inventory complexity.

Practical tips for best results

• Secure the workpiece firmly and use a slow-start feed to prevent deflection on the pilot section.
• Maintain appropriate cutting speeds for the material; cooler operation is recommended for stainless steel to prolong tool life.
• Use light, steady pecking if drilling deep holes to clear chips and prevent clogging, especially in steels.
• Inspect the point and flute for wear; re-sharpen as needed to preserve hole accuracy and center Punch alignment.
• Apply a compatible coolant or lubrication to reduce heat and extend tool life on tough materials.

Whether upgrading your workshop toolkit or equipping a dedicated production line, the Dormer Pramet A125 10.00 mm x 400 mm HSS straight shank drill provides extended reach with dependable performance across common metals. BS 328 approved and built to handle demanding metalworking tasks, it’s a smart choice for engineers, machinists, and maintenance technicians who value precision, durability, and efficiency.