3 Steps to Find Your Right Drills Bit Easily!

Follow these 3 steps, you will find your right drill bits easily!
Step 1: What is your processing method? 
1) Through
2) Blind
3) Flat Bottom
4) Chamfer
5) Step
6) Cross
7) Inclined Surface

Step 2: What is your processing material?
According to the specifications of ISO 513, the materials are classified into six common types according to the characteristics of the materials.
Low-alloy steel and cast steel
High-alloy steel and cast steel
e.g., S45C, 1045, CK45, 1.0503; SCM440, 4140, 42CrMo4
Stainless steel (austenitic)
e.g., AISI 316, SUS316, 0Cr17Ni-12Mo2, SUS304, X5CrNi18-10, JIS SUS304L
Grey cast iron (GCI)
Ductile cast iron
Nodular cast iron (NCI)
Non-ferrous metals:
Aluminum and aluminum alloys
e.g., A1070, A4032, A6061, A5052, A7075, AC, ADC, AlZnCu1.5
- Titanium and titanium alloys
e.g., Ti6Al4V, Ti6Al2Sn4Zr2Mo, Ti4Al4Mo2Sn0.5Si, Ti10Al2Fe3Al, Ti5Al5V5Mo3Cr, Ti7Al4Mo
- Nickel / Inconel
e.g.,  Inconel 601, 617, 625, Incoly 800, Monel 400, Inconel 718, 718plus, Incoly 925, Waspalloy, Hastelloy, Rene.
Hardened steel
e.g., SKD61, SKD11, STAVAX, SKT, HPM1, S45C, 1045, 1.0503, C45; 4140, SCM440, 42CrMo4.

Step 3: How to choose the size you exactly need?

The basic 3 elements of drilling:
  • ​1. The size of the hole
  • 2. Depth of the hole
  • 3. The accuracy of the hole
The last step is to select the most suitable drill bit based on these 3 elements.
  1. The size of the hole: You use metric? Or inch? Do you know the number of tap threads? Or forming tap? Then you will know the size you need to use.
  2. What’s your processing depth (=Depth of the hole)?3 times of the diameter? The maximum of Speed Tiger’s Drill Bits is 8 times.
  3. The accuracy of the hole: There are h6 ~ h13, and the tolerance class of Speed Tiger’s Dill Bits is h7.

ISO 513: 2004 Classification.