Drill bit NEO tools HSS-Co for metal, 4.0 mm (57-024)

NEO tools HSS-Co 4.0 mm metal drill bit is a precision cutting tool made from high-speed steel with cobalt alloy designed specifically for drilling holes in steel and other ferrous materials. Its HSS-Co composition increases hardness at elevated temperatures, improving wear resistance during through-drilling and repeated operations. The bit is intended for use with hand-held drills and drill presses in workshops, construction sites and repair tasks that require reliable metal-cutting performance.

Advantages

The cobalt-enriched high-speed steel composition enhances heat tolerance and prolongs tool life compared to standard HSS bits, reducing the risk of edge softening when cutting harder metals. Its ground geometry provides stable centring and efficient chip evacuation, which helps maintain drilling accuracy and reduces the likelihood of workpiece damage. Compact diameter makes it suitable for precise hole-making and for tasks that require consistent hole size.

Suitable for

• Drilling holes in mild and alloy steels
• Workshop maintenance and mechanical repairs
• Installation tasks on construction sites where metal penetration is required
• Use with hand drills and benchtop or floor drill presses

When it may not be suitable

This drill bit is not intended for masonry, wood, glass or ceramic materials; using it on such materials will cause poor cutting performance and possible damage to the bit. For very soft non-ferrous metals, a carbide or standard HSS bit with different geometry may be more efficient. Extremely high-speed applications without appropriate cooling may still shorten tool life despite the cobalt enhancement.

Key specifications

• Material: high-speed steel with cobalt alloy (HSS-Co)
• Diameter: 4.0 mm
• Intended material: steel and other ferrous metals
• Shank style: straight round shank (suitable for standard chucks)
• Cutting geometry: ground tip for centring and chip evacuation

How to use

Secure the drill bit firmly in the drill chuck and set the drill to an appropriate rotational speed for metal drilling—moderate speeds for harder steels and higher speeds for softer ferrous materials. Mark the drilling position and, when necessary, use a centre punch to prevent walking. Apply steady, even feed pressure and use cutting fluid or coolant to reduce heat and extend tool life. Withdraw the bit periodically to clear chips and prevent clogging.

What to consider before purchase

• Confirm that a 4.0 mm diameter meets your hole-size requirements.
• Ensure your drill chuck accepts a straight round shank and secures the diameter safely.
• Verify that intended materials are ferrous metals; select a different bit type for masonry, wood, or glass.
• Plan for proper cooling or cutting fluid when drilling thicker or harder steel to maintain performance.

Usage recommendations

Use cutting fluid for prolonged operations, start drilling with a pilot mark or centre punch, and match drill speed to material hardness to achieve consistent hole quality and longer tool life.