Dormer Pramet A125 3.30 mm x 160 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A125 3.30 mm x 160 mm HSS ST Straight Shank Extra Long Series Drill BS 328—the deep-hole specialist your workshop relies on when reach matters as much as sharpness. Built for precision and longevity, this drill is engineered to push through tight spaces and long workpieces with confidence.

Key features that translate to real-world results

• 118-degree conventional point for decisive penetration and clean entry. The geometry is designed to bite quickly, stay on center, and be easily re-sharpened when needed, reducing downtime on long jobs.
• Steam oxide finish minimizes built-up edge and sticking of work-piece material to the cutting edge. This translates to smoother cutting action, less heat buildup, and better chip evacuation—especially important on longer drills where heat can be a challenge.
• Extra long length series (160 mm) delivers the reach you need for drilling very deep holes or accessing internal features that standard drills can’t reach. Perfect for through-holes, pocket drilling, or workpieces with extended contours.
• Premium HSS material offers robust performance across a broad material mix, including steel, aluminium, and stainless steel. The alloy combines hardness with good heat resistance, letting you drill through varied workpieces without swapping bits.
• Straight shank design provides universal compatibility with a wide range of machines, from benchtop drill presses to CNC mills, clamps, and chucks. No special adapters required—just reliable seating and consistent runout.

Why this drill stands out

Depth and precision are the dual goals of any deep-hole task. The A125’s combination of a true 118° tip, a steam-oxidized surface, and an extended 160 mm reach means fewer tool changes and less risk of wandering on entry. This is not a one-size-fits-all drill—it's optimized for deep drilling in a variety of materials, with performance that you can feel in smoother starts, steadier chip flow, and cleaner holes.

Ideal use cases

• Deep through-holes in steel or aluminum chassis, housings, or brackets where standard-length drills fall short.
• Internal drilling tasks on long workpieces or fixtures that require precise alignment and minimal re-positioning.
• Prototyping and small-batch manufacturing where quick, reliable set-ups reduce downtime.
• Maintenance and repair work in automotive, plumbing, or electrical enclosures where deep access is common.

Practical tips for best results

• Use appropriate coolant or cutting fluid to maximize tool life and chip evacuation, especially at full depth.
• Set conservative spindle speeds and feeds for the material being drilled to prevent overheating of the HSS and preserve the tip geometry.
• When re-sharpening, maintain the original 118° point to keep entry performance consistent.
• Ensure a rigid setup with proper workholding to minimize vibrations that can degrade hole accuracy on long drills.

Engineered for professionals who demand both reach and reliability, the Dormer Pramet A125 3.30 mm x 160 mm HSS ST Straight Shank Extra Long Series Drill BS 328 is the go-to choice for deep, accurate drilling across steel, aluminium, and stainless steel. If your current toolkit struggles with depth or consistency, this drill bit is built to deliver precise holes, longer tool life, and fewer interruptions in your workflow.