Dormer Pramet A125 37/64 Inch x 310 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Engineered for precision and long-lasting performance, the Dormer Pramet A125 37/64 Inch x 310 mm HSS Straight Shank Extra Long Series Drill (BS 328) is built to reach deep into tough workpieces without compromising starting accuracy.

Key features include a 118-degree conventional point that delivers a strong, chatter-free start and is easy to re-grind for extended tool life. The 118° geometry reduces wandering when piercing through metal, helping you maintain a true hole axis from the first cut.

The steam oxide finish minimizes adhesion and built-up edge, allowing smoother chip flow and cleaner holes across a variety of materials. With a robust premium HSS composition, this drill handles drilling into steel, aluminium, and stainless steel with dependable performance.

Designed as an extra-long drill, it provides an extended reach ideal for deep holes, internal voids, or pockets that standard drills can’t access. The straight shank ensures simple, secure clamping in conventional chucks and collets, ensuring rigidity and predictable alignment on both manual and CNC machines. The generous overall length (310 mm / 12.2 in) and a diameter of 37/64 in (0.578 in / 14.69 mm) give you true deep-hole capability without swapping tool families.

Who should use it? This drill is a workhorse for fabricators, machine shops, automotive and aerospace enthusiasts, and any project requiring reliable deep-hole drilling in a range of materials. If you’re building jigs, fixtures, or components where depth and reach matter, the A125 is a trusted choice that pairs well with standard drilling equipment and feeds that suit heavy-HSS drills.

Practical tips: clamp securely, use proper peck drilling technique to evacuate chips, and apply cutting fluid to extend tip life. Start at a light feed to establish the hole, then increase as the material yields. For stainless steel, moderate speeds and ample lubrication help prevent workpiece adhesion and prolong drill life. The 118-degree point also accepts gentle re-sharpening to recover a sharp edge when needed.