Dormer Pramet A125 3/4 Inch x 310 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

The Dormer Pramet A125 3/4 Inch x 310 mm HSS ST Straight Shank Extra Long Series Drill is purpose-built for deep-hole drilling with precision and reliability. This long-reach drill blade is designed to tackle challenging projects where standard bits simply don’t reach, delivering consistent performance from start to finish.

118-degree conventional point for clean starts and steady progress
Equipped with a robust 118° point, this drill bites into workpieces with a confident, self-centering start. The geometry helps minimize wandering, promotes true holes, and makes re-grinding simpler when maintenance is needed—keeping downtime to a minimum and productivity high.

Steam oxide finish to lessen sticking and heat buildup
The steam oxide coating reduces friction between the cutting edge and the material being drilled. This means smoother chip evacuation, less heat buildup, and cleaner hole walls across a range of materials. It’s especially beneficial when drilling longer runs where edge protection and consistent cutting performance matter most.

Extra-long reach for deep holes and hard-to-access work
With a length of 310 mm and a straight shank, this bit makes deep-hole projects practical and efficient. It’s ideal for applications that require extended reach into thick workpieces, recessed cavities, or tight setups where shorter bits can’t do the job. The extra-long series minimizes the need to reposition and increases accuracy in demanding fabrication tasks.

Premium HSS for broad material versatility
Manufactured from high-speed steel, this drill bit handles a wide spectrum of materials, including steel, aluminium, and stainless steel. The combination of premium HSS and the 118-degree point provides dependable performance, resistance to wear, and the durability needed for repetitive drilling in a busy workshop.

Versatility across machines and applications
Whether you’re using a drill press, a CNC machine, or a handheld drill, the A125 bit is built to perform. Its straight shank ensures secure clamping and reliable alignment, while the long flute design supports efficient chip clearance during extended drilling sessions. This makes it a practical choice for automotive, fabrication, maintenance, and general engineering environments where precision and reach matter.

Key specifications at a glance

• Diameter: 3/4 inch
• Length: 310 mm
• Shank: Straight
• Material: Premium HSS
• Tip geometry: 118-degree conventional

Practical tips for best results
- Maintain the 118° geometry: re-sharpen carefully to preserve the point angle for precise starts and hole accuracy. - Use appropriate cooling or cutting oil to reduce friction and extend bit life, especially on tougher materials. - Secure the workpiece firmly and use gradual depth increments on deep-hole tasks to manage heat and chip buildup. - Match drill speed to the material: lighter materials like aluminum respond well to moderate speeds, while steel and stainless benefit from controlled, steady feeds and adequate lubrication. - Inspect the bit for wear after long runs; the longer reach can magnify any deviation, so re-check alignment before continuing deeper passes.

In short, the Dormer Pramet A125 3/4 Inch x 310 mm HSS ST Straight Shank Extra Long Series Drill is your go-to solution when depth, reach, and dependable performance are non-negotiable. Its 118-degree point, steam oxide finish, and premium HSS composition combine to deliver clean starts, smooth operation, and durable cutting life across a variety of metals and machining setups.