Do you know what types of drill bits are in real life?


Drill bits are relatively common in our daily lives, bu […]

Drill bits are relatively common in our daily lives, but many people may not know the specifications of drill bits. In fact, there are many types of drill bits, which are mainly distinguished according to their different uses, that is, what kind of drill bit is used for what to drill. Common drill bits include twist drills, flat drills, deep hole drills, reamer drills, countersink drills, center drills, etc. Let's take a look at them in detail below.

What are the types of drill bits

A. Classified by structure

(1) Integral drill bit: The drill top, drill body, and drill shank are integrally manufactured from the same material.

(2) End-welded drills, the top of the drill is welded by carbides.

B. Classification by drill

(1) Straight shank drills: drills with a diameter below ψ13.0mm, all use straight shanks.

(2) Taper shank drill bit: The drill bit shank is tapered, and the taper is generally Morse taper.

C. Classification by purpose

(1) Center drill bit: generally used for centering before drilling, the front end cone has 60°, 75°, 90°, etc., in order to support the tailstock during lathe operation, the 60° center drill and the lathe tail should be used. The seat top center 60° matches.

(2) Twist drill bit: It is the most widely used drill bit in industrial manufacturing. We generally use twist drill bit.

(3) Super hard drill bit: The front end of the drill body or all of it is made of super hard alloy tool material, which is used for drilling of processing materials.

(4) Oil hole drill: The drill body has two small holes through which the cutting agent reaches the cutting edge part to take away heat and chips. Use this drill to rotate the work while the drill is stationary.

(5) Deep hole drill: It was first used for the drilling of barrels and stone-clad tubes, also known as barrel drills. The deep hole drill is a straight groove type, which cuts a quarter of the strong part in a round tube to produce cutting edge chip removal.

(6) Drill bit reamer: For mass production, the front end is a drill bit and the back end is a reamer. The diameter of the drill bit and the diameter of the reamer are only the margin of the reaming hole. There are also drill bits that are mixed with screw tapping, so It is called a hybrid drill.

(7) Taper drill bit: When processing the mold feed opening, taper drill bit can be used.

(8) Cylindrical hole drill: We call it a countersunk milling cutter. The front end of this drill has a smaller diameter part called a ball.

(9) Tapered hole drill: It is used for drilling tapered holes. The front end angles are 90°, 60°, etc. The chamfering tool we use is a kind of tapered hole drill.

(10) Triangular drill: a drill used in electric drills, the drill shank is made into a triangular face, so that the chuck can secure the drill.


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