drill bit number chart,Drill Bit Number Chart: A Comprehensive Guide

Drill Bit Number Chart: A Comprehensive Guide

When it comes to drilling, the choice of drill bit is crucial. The right drill bit can make the process smoother, more efficient, and less likely to damage your materials. To help you make an informed decision, we’ve compiled a detailed guide to the drill bit number chart. This guide will cover various aspects, including the different types of drill bits, their sizes, and their applications.

Understanding Drill Bit Numbers

Drill bit numbers are a standardized system used to indicate the size of a drill bit. The number itself represents the diameter of the drill bit in millimeters. For example, a drill bit with a number 10 is 10 millimeters in diameter. It’s important to note that drill bit numbers are not the same as the drill bit’s actual size. The actual size can vary slightly due to manufacturing tolerances.

Drill Bit Number	Approximate Diameter (mm)
1	1.5
2	2.5
3	3.2
4	4.0
5	5.0
6	6.0
7	7.0
8	8.0
9	9.0
10	10.0
11	11.0
12	12.0
13	13.0
14	14.0
15	15.0
16	16.0
17	17.0
18	18.0
19	19.0
20	20.0

Types of Drill Bits

There are several types of drill bits available, each designed for specific applications. Here’s a brief overview of the most common types:

High-Speed Steel (HSS) Drill Bits: These are the most common type of drill bits and are suitable for general-purpose drilling in wood, metal, and plastic.
Carbon Steel Drill Bits: Carbon steel drill bits are ideal for drilling through soft metals like aluminum and brass.
Carbide-Tipped Drill Bits: Carbide-tipped drill bits are designed for drilling through harder materials like stainless steel, cast iron, and non-ferrous metals.
Wood Drill Bits: Wood drill bits have a special tip and flute design that allows for smooth drilling in wood and other soft materials.
Brass and Bronze Drill Bits: These drill bits are designed for drilling through brass, bronze, and other non-ferrous metals.