Dormer Pramet A125 1/4" x 310 mm HSS Straight Shank Extra Long Series Drill BS 328 is a purpose-built solution for professionals who demand depth, precision, and durability in a single tool. This drill bit is crafted to tackle demanding deep-hole tasks without compromising hole quality or rigidity.

• 118° conventional point — a strong, self-centering tip that starts cleanly and resists wandering. The geometry is designed to hold its edge, making re-grinding straightforward when you need to extend tool life.
• Steam oxide finish — a non-stick coating that minimizes built-up edge, promoting smoother cutting and reliable chip evacuation across a range of materials from steel to aluminum and stainless steel.
• Extra-long length (310 mm) — specifically engineered to reach deep holes and recessed areas where standard bits fall short. The extended reach expands your drilling options in fabrication, automotive, and construction projects.
• Premium HSS (high-speed steel) — this high-grade material delivers strong performance across multiple materials, delivering consistent hole size and finish whether you’re drilling steel, aluminum, or stainless steel.
• Straight shank — compatibility with common drill chucks and collets ensures stable, straight holes and minimizes runout during operation.
• BS 328 compliant — manufactured to standard specifications, offering reliability and interchangeability within professional tooling ecosystems.

Ideal for machinists, fabricators, and maintenance technicians, this drill bit excels in applications that require deep-hole drilling, long reach, and dependable performance in a variety of materials. Use it for piercing through thick steel sections, drilling through automotive frames, or creating deep clearance holes for fasteners and dowels. The 1/4 inch shank fits standard drill presses and hand drills, providing versatility across workshop setups.

Practical tips for best results:

• Match speed and feed to the material: lighter feeds with steady RPM for aluminum; moderate feeds with adequate lubrication for steel and stainless.
• Start with a center punch to establish the initial guide and prevent walking on the entry.
• Keep the bit cool with cutting fluid or lightweight oil to prolong edge life and reduce heat-induced wear.
• Clamp workpieces securely to maintain straightness and reduce deflection in deep-hole drilling scenarios.