Dormer Pramet A125 1/16 Inch x 160 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

The Dormer Pramet A125 1/16 x 160 mm HSS Straight Shank Extra Long Series Drill is built for serious deep-hole work. With a compact 1/16" diameter and a generous 160 mm overall length, this drill delivers dependable reach when standard-length bits fall short, making it an essential tool for fabrication, maintenance, and curious DIY metalwork where access is limited.

• 118-degree conventional point: a strong, self-centering tip that stays true on initial entry and is easy to re-sharpen, helping you maintain accuracy over time. This geometry is a staple for general-purpose drilling in steel and other metals.
• Steam oxide / steam tempered finish: engineered to reduce chip adhesion and help keep the cutting edge clear during long drills, improving chip flow and overall tool life. Availability can vary by catalog, but the goal remains the same: steadier cuts and less sticking at depth.
• Extra-long length (10xD depth capability): specifically designed for drilling very deep holes and reaching recessed areas without sacrificing rigidity. The A125 series meets BS 328 standards for long-reach applications, with an overall length of 160 mm and a flute length around 100 mm for controlled chip evacuation.
• Premium HSS material: a versatile workhorse suitable for drilling a wide range of metals, including steel, aluminum, and stainless steel, making it a reliable choice across multiple projects.
• Straight shank for broad machine compatibility: designed to fit common chucks and collets across benchtop drills, milling machines, and CNC setups, providing stable guidance in a variety of machines.

Specifications you can rely on include a 1/16" (approximately 1.59 mm) cutting diameter, 160 mm total length, and a flute length of about 100 mm, with the A125 designation indicating the extra-long, straight-shank family. These dimensions align with BS 328 standards and are repeated across trusted distributors and Dormer Pramet catalogs.

Ideal use cases include deep holes in steel chassis components, engine blocks, and other thick metal work where access is limited or pecking would slow production. The A125 series is commonly specified for 10xD hole drilling without pecking in steel, offering a single-pass option when the depth would otherwise require multiple shorter drills. This makes it a practical choice for shop floors and maintenance bays aiming to reduce tool changes and downtime.

Practical tips to get the most from your A125 drill:

• Set cutting speeds and feeds to suit the material: use lower feeds in harder steels and ensure ample lubrication to minimize heat buildup and edge wear.
• Peck drilling is usually unnecessary with this length when drilling steel, but periodically retract to clear chips if you encounter resistance or binding.
• Begin with a light touch to establish the pilot entry, then gradually increase depth to maintain steady progress and reduce wandering.
• Keep the drill sharp and re-sharpen when needed to preserve the 118° point geometry and ensure clean holes.

In short, the Dormer Pramet A125 1/16 x 160 mm HSS Straight Shank Extra Long Series Drill combines long-reach capability with reliable cutting geometry and versatile material compatibility. It’s a precise, durable choice for professionals who regularly encounter deep, hard-to-reach holes in steel, aluminum, and stainless steel—and who value consistent performance from a single extended drill.