Drill bit Dolfamex NAWIERTAK NWRC-L 3.15 L-100 — 3.15 mm shank length 100 mm

Dolfamex NAWIERTAK NWRC-L 3.15 L-100 is a straight shank drill bit with a nominal diameter of 3.15 mm and an overall length of 100 mm. Designed for use in handheld drills and drill presses, this slim, long-reach bit is intended for precision drilling in metal, plastics, printed circuit boards (PCB) and model-making where small, accurate holes are required. The bit's geometry supports stable cutting and helps maintain straightness through the full length of the flute.

Advantages

This 3.15 mm drill bit offers a long working length that enables drilling through thicker materials or reaching recessed areas without sacrificing control. Its slender diameter provides minimal material displacement, reducing the risk of splitting in thin plastics or delamination in PCBs. The shank is compatible with standard 3.15 mm chucks and adapters commonly used in hobbyist and light industrial drills, making it convenient for a variety of equipment.

Suitable for

• Precision metalworking on thin sheets and small parts
• Drilling holes in plastics and acrylics for fittings or fasteners
• PCB drilling and electronics prototyping
• Model-making, crafts and hobby projects requiring small, straight holes

Key specifications

• Nominal diameter: 3.15 mm
• Overall length: 100 mm
• Shaft type: straight shank suitable for 3.15 mm chucks/adapters
• Intended use: handheld drills and drill presses
• Typical materials: metals, plastics, printed circuit boards, model materials

How to use

Secure the drill bit in a properly tightened chuck or collet designed for small-diameter bits, ensuring minimal runout. Select an appropriate spindle speed and apply steady, moderate feed pressure—too much force can break a slim bit, too little can cause rubbing and poor hole quality. Use cutting fluid or lubrication when drilling metals to extend tool life and improve surface finish. For PCBs and plastics, lower speeds and light pressure help prevent melting or delamination. After use, clean swarf from the flutes and store the bit in a protective case to avoid damage.

Usage recommendations

For best results, match drill speed and feed to the material: higher speeds with light feed for plastics and lower speeds with lubrication for steels. Inspect the bit before use for straightness and sharpness; replace or re-sharpen if performance declines. When drilling through stacked or thin materials, consider backing the workpiece to reduce burrs and improve hole quality.