Twisted Drill Bits
Twist bits can be used for drilling products from wood and plastic to metal, but not masonry and concrete products. They are mainly used to drill through metal.
Quick View of Twisted Drill Bits
Manufactured to DIN 338 standard
Material and Grade: HSS 4241, HSS 4341, HSS 6542 (M2), HSS M35 Cobalt 5%
Surface Finish are available of Bright, bright, amber, titanium-coated
Point angle: 118°or 135°
Shank type: Straight, Reduced Shank,1/2" Shank Sliver & Deming, 1/4" Quick Change Hex Shank,Three Flat Shank
Process: Rolled, rolled&polished, fully ground
Advantages of Twisted Drill Bits
In the case of the same size and hole depth, the power consumption of twist drills is relatively low. The tip can be held for a longer period of time.
The grooved portion allows metal chips to be easily filtered out of the channel for the flutes. Reduced operating time, high speed and safety.
Different Types of Twisted Drill Bits
Each operator should pay attention to hardness of the drill bit materials which must be higher the material being drilled.
General HSS
When drilling woodworking material, with woodworking drill, tool hardness is not high, tool material is generally high speed steel (HSS).
Cobalt HSS
When drilling holes in alloy steel, non-alloy steel, cast iron, cast steel, non-ferrous metals and other general metal materials, metal drills are recommended. This kind of drill is generally made of high-speed steel, which is an advanced cutting tool that contains cobalt.
Carbide
Drill in concrete materials and stone materials, should use the impact drills, combining with masonry drill, the drill bit material is generally Carbide.
Tungalloy
For ceramic tile and glass with much harder，the drill bits material is tungsten alloy. Due to the high hardness and poor toughness of the tool, it is necessary to pay attention to use at low speed.
