DIY Drill Bit Set for Metalworkers

The Drill America cobalt drill bit set includes 5 drill bits ranging in sizes from 1/4 inch to 1/2 inch: specifically, 1/4", 5/16", 3/8", 7/16", and 1/2". These drill bits are crafted to meet the National Aerospace Standard 907, ensuring high-quality performance. Cobalt drills are renowned for their exceptional hardness, which allows them to achieve speeds up to 30% faster than traditional M2 high-speed steel bits. This makes them particularly effective for drilling into tough materials like stainless steel, Inconel, and titanium.

One of the key features of these drill bits is the 135-degree split point design, which promotes self-centering and reduces the amount of force needed during drilling. Cobalt steel, used in the construction of these tools, contains higher amounts of cobalt compared to standard high-speed steel. This enhancement significantly improves their cutting performance, especially when working with harder metals such as stainless steel and nickel alloys.

The gold oxide surface treatment applied to these bits is a thin layer that distinguishes them from black oxide-coated tools. Despite its minimal thickness, the gold oxide coating helps to identify the cobalt steel construction and provides performance characteristics similar to uncoated tools.

These drill bits feature round shanks, allowing them to be compatible with a wide range of tool holding systems. Additionally, the spiral fluted design is optimized for counterclockwise (right-hand cut) operation, effectively evacuating chips upwards and out of the cutting path. This reduces the likelihood of clogging during drilling operations, thereby enhancing efficiency and prolonging tool life.

Overall, the Drill America cobalt drill bit set adheres to the rigorous standards set by the National Aerospace Standard 907, ensuring reliability and performance excellence across various drilling applications.

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