5 Best Metal Drill bits for Professional Technicians 2019 – Buyer’s and Guide
Metal drill bits are heat resistance metal cutting pieces used in making circular holes when placed in a mechanical device that rotates them.
Professionals and DIY enthusiasts looking for best metal drill bits should therefore consider both the material hardness and extraction speed. Hard metals like stainless steel require even more special bits that can withstand more pressure and friction. Here, we’ll be working you through the step by step guide to choose the best metal drill bits your jobs.
How to choose the best metal drill bits?
To correctly choose the best metal drill bits, it is best to ask about the type of metal you are going to drill.
Metals have different densities, a characteristic that justifies (apart from the difference in weight between two metals, such as lead and aluminum) their hardness and resistance to perforation. This density determines the design of the bit, which should be harder than the metal we want to drill: a bit that pierces the aluminum with ease will hardly be able to scratch an alloy of iron and carbon.
To deal with the problem of the density of metals, metal drills can be made of different materials and be composed of different elements that improve their hardness and thus the quality of their drilling.
Below are types of metal drill bits
1. High speed steel (HSS)
High speed steel bits are used to make holes in soft metals such as aluminum. Generally, these drill bits have a layer of titanium nitride. This helps the drill cut more smoothly through the metal without locking it. High speed steel bits can cut any type of domestic metal. These drill bits, which are usually black, can withstand more heat than other drill bits. They are the cheapest of the metal bits because they do not last as long and need to be replaced before those of cobalt or titanium.
2. Cobalt drills
Cobalt bits are also used to make holes in metal. These have a copper finish and are more expensive than other metal bits. Cobalt bits are the best choice for making holes in stainless steel and other hard metals because they are stronger than high speed steel bits. Cobalt drills are kept cooler than high speed steel drills, which makes them a better choice for drilling hard metals. Doing this can take more time than making holes in soft metals, so a drill can heat up. A bit become weakens as it heats up, so keeping the cobalt bit cold increases its strength.
3. Titanium bits
Titanium bits are also good for cutting hard metals such as stainless steel and iron. These last three times longer than those of high speed steel. The axes of the titanium drill bits are larger than the HSS. As a result, they are less likely to fend off or break. Drilling in metal requires more pressure in the drill, which can put tension on the axes of the drill. Because it is stronger than any other metal, titanium bits do not wear out as fast. Instead of sharpening or replacing them, they can be used longer.
Features of metal drill bits to look into when buying one
1. Diameter of the bit
This represents the tool external cylindrical measurement, also referred to as the bit cutting diameter, which means the hole size created using the tool.
2. Length of the bits
There are two length measurement to be examined in metal drill bits, on one hand is the complete measurement between the ends of the tool and on the other hand, there is the cutting length of the bit.
In the total length of the tool between ends, there are bits of different sizes (extra-short, short, normal, long and extra-long) for the same diameter, everything depends on the depth to be worked on the material.
And we must also consider the length of cut, which is defined by the length of the drill's propeller. Although it is true that only the tip of the tool works, this length defines the depth of work by the eviction of the chip removed in the task.
3. Cutting angle
This is the angle of the bit at the tip, which is the working area of the tool. The most common angles to find are 118º and 135º
4. Handle of the drill bits
The metal drill bits are provided at one of their handle ends. This handle is the mooring area of the tool with the bit holder of the drill.
We can find drill bits with cylindrical, conical and flat-faced hexagonal handles. It is also possible that on occasion you may need bits with the handle reduced or reduced in diameter.
5. Propeller angle
These angles are variable depending on the hardness of the materials to be worked. They are defined by letters according to the angle of the bit:
- N - the propeller has 30º angle, its use is usual for all types of materials.
- W - for angles of 40º and 45º, suitable for drilling metals such as brass and aluminum.
- H - with angles of 15º and 20º, also called slow propeller, suitable for voluminous chip materials.
- S - with an angle of 35º and normally used to drill the stainless steel.
After having made a general review of which are and the parts of the metal bits, we will make another review of the most common types and their recommended utilities.
How to care for your metal drill bits
Despite its high quality resistance, metal drill bits need a lot of concrete care. These drills are mostly used for hard work, so they become easily heated. In lieu of this, to make it durable, it is best to cool it constantly when being used, which can be achieved with special oils for drill or water. In addition, it’s highly important to possess a drill sharpening machine, because it promotes the durability of the drills, in order to extend its good working life.
5 Best Metal Drill Bits 2019
My best pick from the above drilling bits is Bosch CO2148 21/64 In. x 4-5/8 In. Cobalt Drill Bit. This drill bit set is available in different sizes to cover diameters when needed. Among the many features of these powerful drill bits is its heat resistance ability, durability and guarantee to work on any metal materials.
Bosch CO2148 21/64 In. x 4-5/8 In. Cobalt Drill Bit will deliver a top notch performance whenever you used it if you always apply coolants to it. These powerful drill bits are the go-to guy for professionals looking for reliable bits that guarantee long term operation for heavy duty jobs.