Introducing the 115PC Cobalt Drill Bit Set, a must-have for any DIY enthusiast or professional tradesperson. This comprehensive set includes a range of drill bits made from high-quality cobalt steel, ensuring exceptional durability and longevity. With sizes ranging from 1/16 inch to 1/2 inch, this set covers all your drilling needs for various materials including metal, wood, and plastic. The bits feature a 135-degree split point tip, allowing for precise and clean drilling without any wandering. The set comes neatly organized in a sturdy case, making it easy to store and transport. Upgrade your drilling arsenal with the 115PC Cobalt Drill Bit Set and experience efficient and reliable drilling every time.
Standard Twist Drill Angle
Twist the basic Angle that twist drills includes vertex Angle, horizontal edge bevel Angle, before horn and hind horn 4 parts.
1. The apex Angle
The Angle between two cutting edges of twist drill is called vertex Angle. Angle is generally 118°, drilling soft materials can be smaller, drilling hard materials can be larger.
2. Bevel of the edge
The Angle between the horizontal edge and the main cutting edge is called the apex Angle and is usually 55*. The bevel Angle of the edge varies with the Angle after grinding. After the Angle is large, the bevel Angle of the cutting edge becomes longer, and the circumferential force increases when drilling. If the rear Angle is small, the reverse is true.
3. The anterior horn
Generally -30*~30*, the largest at the outer edge, near the center of the bit into a negative rake Angle. Twist drill helix Angle is bigger, front Angle is bigger also.
4, after Angle
The twist drill's back Angle also varies, with the smallest at the outer edge and the largest at the center of the Drill Bit. The value ranges from 8* to 12*.
Cobalt steel bits last longer, cut faster than high speed steel
29 fractional sizes: 1/16 in. to 1/2 in. by 64ths
26 letter sizes: A-Z
60 numbered wire gauges:1 to 60
Metal storage case
Retains hardness at temperatures up to 1000°
Model NO. GMDB001
Transport Package on Customer′s Requiments
Product Categories : Drill Bit > Twist Drill Bit
