Bosch HSS Metal Spiral Drill Bit 4x43x75mm, CYL Shank, 2-Piece Set

The Bosch HSS metal spiral drill bit set is a high-quality tool designed for precision drilling in various metal materials. With a diameter of 4mm, a working length of 43mm, and a total length of 75mm, these bits are engineered to provide consistent performance and durability. The high-speed steel construction allows for efficient material removal and heat resistance, ensuring that the bits maintain their sharpness during demanding metalworking tasks.

Advantages

These drill bits offer exceptional stability and accuracy due to their robust high-speed steel composition. The standard cylindrical shank design ensures compatibility with a wide range of drill chucks, making them a versatile addition to any toolbox. The precision-ground geometry facilitates clean entry and efficient chip evacuation, which reduces the risk of overheating and extends the overall service life of the tool.

Suitable for

• Drilling holes in alloyed and non-alloyed steel
• Working with cast iron and non-ferrous metals
• General metalworking and mechanical repair tasks
• DIY projects requiring precise 4mm diameter holes

When it may not be suitable

These drill bits are specifically optimized for metal applications and may not perform efficiently when used on masonry, concrete, or extremely hard materials like hardened steel or ceramics. Using them on materials outside their intended scope may lead to premature dulling or damage to the cutting edges.

Key specifications

• Diameter: 4mm
• Working length: 43mm
• Total length: 75mm
• Material: High-speed steel (HSS)
• Shank type: Cylindrical
• Quantity: 2-piece set

How to use

To achieve the best results, secure your workpiece firmly to prevent vibration or movement during the drilling process. Insert the drill bit into the chuck of your power tool and tighten it securely. It is recommended to use a center punch to mark the exact drilling location to prevent the bit from wandering. Apply steady, moderate pressure and use a lower rotational speed for metal to prevent overheating. Periodically clear the chips from the hole and use a suitable cutting oil to lubricate the bit, which helps maintain temperature and improves the quality of the finish.

What to consider before purchase

• Verify that your drill chuck is compatible with a standard cylindrical shank.
• Ensure the 4mm diameter meets the specific requirements of your project.
• Check if your power tool supports the recommended speed settings for metal drilling.

Usage recommendations

For optimal performance and longevity, always use a cooling lubricant when drilling into metal and avoid applying excessive force, which can cause the bit to break or overheat.