YATO YT-4020 is a set of two HSS twist drill bits with a 2 mm diameter and an overall length of 49 mm, engineered for precision drilling in metal and various other materials. Manufactured from high-speed steel, these drill bits are intended for use with handheld drills and drill presses to produce small, accurate holes in fabrication, repair work, electronics assemblies and hobby projects.
Advantages
The HSS material offers good hardness and heat resistance for continuous cutting, while the precise 2 mm diameter and ground flute geometry deliver stable centring and clean chip evacuation. The cylindrical shank ensures secure clamping in standard drill chucks and the compact length provides control when drilling thin sheets or small components. Supplied as a pair, the set is convenient for keeping a spare or for alternating between workpieces.
Suitable for
- Drilling holes in cast iron and non-ferrous metals
- Precision drilling in stainless steel and thin metal sheets
- Work on plastics and composite materials
- Electronics, PCB prototype drilling and small-scale fabrication
- Repair, maintenance and hobby projects requiring small diameter holes
When it may not be suitable
These 2 mm HSS bits are designed for small-diameter, precision work; they are not intended for large-diameter drilling or heavy material removal. For high-volume production in very hard materials or for drilling large holes, carbide or coated larger-diameter drills and specific machining tools may be more appropriate.
Key specifications
- Type: Twist drill bit
- Material: High-speed steel (HSS)
- Diameter: 2 mm
- Overall length: 49 mm
- Shank: Cylindrical
- Quantity in set: 2 pieces
- Recommended materials: Cast iron, non-ferrous metals, stainless steel, plastics
How to use
Secure the cylindrical shank in the drill chuck and tighten firmly to prevent slippage. Select an appropriate spindle speed for 2 mm HSS drills—generally higher speeds for non-ferrous metals and plastics, lower speeds and steady feed for stainless steel. Use cutting fluid or lubricant when drilling metals to extend tool life and improve chip removal. Start with a centre punch on thin or curved surfaces to improve accuracy, and apply moderate, steady pressure until the hole is complete. Replace the bit if wear or chipping appears.
What to consider before purchase
- Confirm the 2 mm diameter matches the hole size required for your application.
- Check compatibility of the cylindrical shank with your drill chuck size.
- Assess whether HSS is suitable for the material and volume of work; consider coated or carbide drills for harder materials or extended production runs.
- Ensure you have appropriate coolant/lubricant and correct drill speeds for metals.
Usage recommendations
Use appropriate cutting fluid for metal drilling, secure workpieces with clamps, and start drilling with a centre punch when precision is required. Store the bits dry and clean to prevent corrosion and inspect for wear before use to maintain accurate results.
