Drill bit Proline HSS-TiN 4.2 mm, set of 2 pieces

Proline HSS-TiN 4.2 mm drill bit, set of 2 pieces, designed for drilling metal with precise results. Made of high-speed steel with a titanium nitride (TiN) coating to extend tool life and improve hole finish. The bit features a 135° split point with adjustable flute geometry to facilitate accurate starts and reduce walking. Diameter 4.2 mm, working length 43 mm, overall length 75 mm.

Advantages

The TiN coating increases wear resistance and reduces friction, which helps maintain cutting performance over time. A 135° split point improves centering and penetration in metal, while the ground flutes ensure consistent chip evacuation and smoother hole surfaces. Supplied as a pair for convenience and replacement.

Suitable for

• Drilling holes in metal (steel, non-ferrous metals)
• General workshop and DIY tasks
• Drilling in wood and plastics (where a 4.2 mm hole is required)

Key specifications

• Brand: Proline
• Model / MPN: 5154378
• EAN: 5903755154378
• Material: High-speed steel (HSS) with TiN coating
• Point angle: 135° (split point)
• Diameter: 4.2 mm
• Working length: 43 mm
• Overall length: 75 mm
• Quantity: Set of 2 pieces

How to use

Select an appropriate drill speed for the material being drilled (lower speeds for harder metals). Secure the workpiece and use a suitable drill chuck to hold the 4.2 mm bit firmly. Apply steady pressure, allow the bit to cut without forcing, and clear chips regularly. For precise starts in metal, use the split point to avoid walking; a center punch can be used where necessary. Use cutting fluid when drilling harder metals to reduce heat and extend bit life.

Usage recommendations

Store the drill bits dry and protected to preserve the TiN coating. Re-sharpen HSS bits when dull, observing the original point geometry. Replace bits when wear affects hole quality or increases required feed pressure.