KWB COBALT HSS CO Twist Drill Bit 1 mm

The KWB COBALT HSS CO twist drill bit is a high-performance precision tool engineered for demanding drilling tasks in hard materials. With a 1 mm diameter and a 5% cobalt alloy composition, this drill bit offers exceptional heat resistance and structural durability, making it a reliable choice for both professional metalworking and intricate DIY projects. Its design features a 135-degree tip angle with cross-ground geometry according to DIN 1412 C, which ensures excellent self-centering capabilities and prevents the bit from wandering on the workpiece surface.

Advantages

This drill bit stands out due to its industrial-grade construction and specialized cobalt alloy, which significantly extends the tool's lifespan when working with abrasive or heat-sensitive materials. The precision-ground cutting edges provide clean, accurate holes with minimal burr formation, while the self-centering tip reduces the need for pre-punching. Its robust design maintains performance even under high thermal stress, ensuring consistent results across a wide range of metallic and synthetic surfaces.

Suitable for

• Drilling stainless steel grades A2 and A4
• Working with alloyed and unalloyed steel
• Processing cast iron and cast steel
• Drilling into bronze and various plastics
• Precision metalworking and thin sheet metal applications

This drill bit is not intended for use with masonry, concrete, or stone, as the high-speed steel composition is optimized for metal and plastic rather than abrasive mineral materials. Additionally, due to its small 1 mm diameter, it is not suitable for heavy-duty drilling tasks that require high torque or large hole diameters, as the bit may be prone to snapping if subjected to excessive lateral pressure.

Key specifications

• Type: Twist drill bit
• Diameter: 1 mm
• Material: 5% Cobalt alloyed HSS
• Tip angle: 135 degrees
• Geometry: DIN 1412 C cross-ground
• Rotation: Right-hand
• Color: Bronze

To achieve the best results, ensure the drill bit is securely fastened in a compatible drill chuck. Begin drilling at a moderate speed, applying steady, controlled pressure to allow the self-centering tip to engage with the material. For harder metals like stainless steel, it is recommended to use a suitable cutting oil to reduce friction, dissipate heat, and prolong the sharpness of the cutting edges. Always maintain a perpendicular angle to the workpiece to prevent bit breakage.

What to consider before purchase

• Verify that your drill chuck is capable of securing a 1 mm diameter shank.
• Ensure the material you intend to drill is compatible with HSS-CO specifications.
• Consider the fragility of small-diameter bits and use appropriate feed rates.

For optimal performance and longevity, always use a cooling lubricant when drilling stainless steel or hard alloys, and avoid applying excessive side force to prevent the drill bit from snapping.