According to the groove shape of the product, it can be divided into straight groove, spiral groove and arc groove;

It can be divided into single blade, double blade, three blade, four blade and multi-blade ladder drill according to the number of cutting edges;

Ladder drill is normally a national standard, and most of them are custom-made and non-standard in daily industrial use. Generally, the manufacturer of ladder drill can produce it by providing drawings.

At present, the integral step drill is manufactured by CBN full grinding. The material is mainly high-speed steel, cemented carbide, etc., and the machining accuracy is required to be high. According to the different processing conditions, the surface coating treatment can be carried out to prolong the service life of the tool and enhance the tool durability. 

The stepped drill is a multifunctional twist drill. Compared with twist drill, the hole diameter drilled has no burr and has a central hole. The stepped drill is a special drill formed by a group of drill steps whose diameter increases step by step.

The ladder drill starts drilling from the minimum diameter to the drill tip, and then expands the hole step by step. Compared with the ordinary drill of the same specification, it has faster drilling speed and higher roundness. It is especially suitable for machining 4mm thin plate and can process large hole with diameter of 40mm at one time.

BOSENDA step drill offers a complete series of specifications, our drill bits series of products has been shipped to lots of countries across different part of the world. For more detailed information, please contact us.