Dormer Pramet A125 9/64 Inch x 160 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A125 drill: a purpose-built, extra-long HSS drill designed for deep-hole tasks where reach and reliability matter. This 9/64 inch diameter bit (approx. 3.57 mm) features a robust 160 mm overall length and a straight shank that fits a wide range of drill chucks and CNC machines, making it a versatile addition to any metalworking toolkit. BS 328 compliant, it’s built for precision in professional settings where consistency isn’t optional.

• 118-degree conventional point for a strong, self-centering starting edge that reduces wandering and speeds up initial penetration. It’s also easy to re-grind when you need to refresh the edge in-field.
• Steam oxide finish minimizes built-up material at the cutting edge, helping you achieve cleaner holes with less sticking and easier chip evacuation.
• Extra-long length (160 mm) engineered for drilling very deep holes or reaching into recessed workpieces, flanges, or assemblies where standard bits fall short.
• Premium HSS construction capable of drilling a broad range of materials—from plain carbon steel and alloyed steels to aluminum and stainless steel—without frequent bit changes.
• Straight shank design ensures broad compatibility with standard drill chucks, collet systems, and automatic machines, delivering stable performance even in longer reach measurements.

Ideal for automotive, fabrication, and industrial workshop environments, this drill excels in applications that demand depth and consistency. Use it for blind holes, clearance holes in thicker materials, or situations where you must maintain straightness over a long reach.

Why choose the Dormer Pramet A125 for deep-hole work? It combines a reliably aggressive point with a corrosion-resistant finish and a durable HSS core, giving you predictable hole sizes, smooth entering behavior, and a longer service life in demanding materials. The straight shank supports steady feeds and reduces slippage, helping you maintain accuracy across passes and setups.

Practical tips for optimal results:

• Use steady, moderate feeds and avoid aggressive plunging to keep the 118-degree point cleanly aligned with the workpiece.
• Apply light cutting fluid or coolant when drilling steel or stainless steel to extend drill life and improve chip evacuation.
• Maintain the bit by re-sharpening the point before the edge becomes visibly dull to preserve hole quality.
• Secure the workpiece firmly and ensure proper work-holding to prevent chatter on long-reach drilling tasks.

Specifications at a glance:

• Diameter: 9/64 inch (approximately 3.57 mm)
• Overall length: 160 mm
• Shank: Straight
• Material: High-speed steel (HSS)
• Coating/Finish: Steam oxide
• Point geometry: 118-degree conventional
• Series: Extra Long
• Standard: BS 328