Dart Hss Ground Twist Drill - 9.5mm - Pk 5

This 9.5mm HSS Ground Twist Drill is suitable for a wide range of materials including cast iron, sheet metal, non-ferrous metal, steel, stainless steel, brass, wood, and PVC.

It means the tip of the drill bit has an angle of 135 degrees and is split in the center. This design allows the bit to start drilling immediately without slipping or needing to pre-centre the hole, and it helps in reducing the torque required for starting.

A ground flute is machined and sharpened, offering better precision, faster chip removal, and a smoother finish. A rolled flute is formed by rolling, which is quicker to manufacture but can result in less precise edges and potentially slower chip evacuation.

No, this is a High-Speed Steel (HSS) twist drill bit designed for metal, wood, and plastic. For concrete or masonry, you would need a masonry drill bit, typically with a carbide tip and a different flute design.

This pack contains 5 drill bits.

The overall length of the 9.5mm drill bit is 125 mm.

The working length, which is the fluted portion of the drill bit, is 8.1 cm.

Ensure the 135° split point tip is properly seated. For very hard surfaces, consider using a centre punch to create a small indentation before drilling.

Reduce drill speed, apply more pressure, and ensure adequate chip removal by occasionally retracting the bit. Use a cutting fluid or lubricant, especially for metal applications.

Check if the drill bit is dull or damaged. Ensure you are using the correct drill speed for the material. Clear flutes of any debris. If drilling metal, consider using a lubricant.

Avoid excessive side pressure or binding the bit. Ensure the hole depth is appropriate for the drill bit's flute length. Use a slower speed for harder materials.