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Twist drills are often used for drilling stainless steel workpieces. For hardened stainless steel, cemented carbide drills can be used, and super hard high speed steel or super fine grain cemented carbide drills can be used when conditions permit. When drilling, the torque and axial force are large, the chips are easy to bond, not easy to break, and it is difficult to remove chips. Work hardening is aggravated, the corner of the bit is easy to wear and tear, and the rigidity of the bit is poor, so it is easy to produce vibration. Therefore, the drill bit is required to grind out the chip groove, grind the cross edge to reduce the axial force, and grind into a double top angle to improve the heat dissipation conditions.

The characteristics of the S-shaped carbide drill are: Without a chisel edge, the axial force can be reduced by 50%; The front corner of the core is positive and the edge is sharp; The thickness of drill core increases, and the rigidity of drill is increased; there are two cutting fluid holes. The arc-shaped cutting edge and the chip flute are distributed reasonably, which facilitates the chipping into small pieces for the discharge.

The characteristics of the indexable carbide shallow hole drill are: There are two convex triangular blades asymmetrically installed in the front of the bit. The different parts of the cutting hole can be automatically centered, the hole has good linearity and the length of cut-in and cut-out is short. The blade has a plurality of pit-shaped chipbreakers on the rake face, which has good cutting performance, especially the chip breaking is reliable, and the chips are consistently crushed; Internal cooling allows the cutting fluid to be sprayed directly onto the drilling surface to improve the cooling effect and the chip removal is very smooth; In particular, different grades of carbide inserts can be used according to the workpiece material, and the cutting speed is 80-120 m/min, and the drilling is very light.