Meccion HSS Cobalt Jobber Drill Bit 3.5mm 🛠️

This compact set of HSS cobalt jobber bits brings high-performance drilling for metalwork and maintenance tasks. The Meccion 10-piece 3.5mm drill set is suited to cutting stainless steel and other tough materials, offering a balance of speed and wear resistance for workshop or on-site use. If you need a 3.5mm cobalt drill bit for stainless steel, this kit aims to reduce chatter and maintain edge life while drilling through hard alloys.

Key Points

These twist drills are made from high speed steel with 5% cobalt, which increases heat resistance and edge retention when working at higher temperatures. The 135° split point is cross-ground to help start holes without drifting and to reduce the need for centre punching, so drilling is more accurate and efficient. For longevity, the manufacturer advises using cutting oil with the bits, especially when machining stainless steel or alloyed steels. A practical 10-piece set offers ready replacements and consistent performance across multiple jobs, which is useful for repeated production or repair tasks. Remember that, according to the manufacturer, the drills reach a heat-treated hardness up to HRC63-64, which contributes to wear resistance and durability 🔧.

Technical Specifications

• Name: Meccion HSS Cobalt Jobber Drill Bit 10pcs 3.5mm
• Material: HSS with 5% cobalt.
• Point angle: 135° cross-ground split point.
• Hardness: HRC63-64 (according to the manufacturer).
• Pack contents: 10 pieces, 3.5 mm diameter each.

Practical Tips

Start drilling at a moderate speed and apply steady pressure to avoid overheating the flute. Use cutting oil to prolong tool life and to improve chip evacuation when working with stainless steel or high alloy materials. For deep holes, peck drilling will help remove chips and prevent the bit from binding. If you experience burrs, pause and clear chips before continuing, as clean chip removal improves finish and extends bit life. When drilling into thin sheet metal, support the material to avoid distortion and reduce the risk of breakage.

Usage Recommendations

These jobber length bits are best for general-purpose metalworking, including stainless steel, cast iron, alloy steel, hard plastics and even certain hardwoods. They are not optimised for masonry or concrete, so use purpose-made bits for those materials. Consider matching drill speed and feed to material hardness; lower speeds suit stainless steel, while slightly higher speeds can be used on softer metals. Keep spare bits to hand for continuous workflows and label storage so sizes are easy to identify.