A Guide to Choosing Twist Drills

Twist drill is a tool used to drill round holes. It is named twist drill because its shape is similar to twist. Twist drill bits are generally made of high-speed steel and alloy. Our SALI products are structured supplemented by high-speed steel twist drills and high-speed steel twist drills containing cobalt M35. Both are suitable for iron processing and wood processing. Cobalt-containing products are suitable for stainless steel processing. It is suitable for drilling stainless steel because it is sharp enough and can drill many holes in the service life. Twist drill materials are currently 6542per4341per4241 and M35. M35 contains cobalt and is relatively expensive. SALI uses 6542 which is equivalent to the 4241 material on the market. It has good raw materials, long service life and fast speed.
Our company's twist drill size is up to 29 kinds, less than or equal to 9mm is 10pcs per Box, and greater than 9mm is 5pcs per Box.
In each box of twist drills, 4000pcs per carton is less than or equal to 4mm, 1000pcs per carton is greater than 4mm and less than 7.5mm, 600pcs per carton is greater than 7.5mm and less than 8.5mm, and 300pcs per carton is greater than 8.5mm and less than or equal to 13mm.
The manufacturing process of twist drill is the main factor that affects its quality. Our product consists of three parts: the handle, the neck and the working part: the handle is smooth and round and can form a good butt with the electric drill; the neck is spiral The 2-slot, smooth curve greatly guarantees the smoothness of the product in use; the working part, that is, the drill bit part and the neck part are smoothly connected, without welding marks, which maximizes the possible swing of the drill bit during use. It prevents excessive drilling position errors, ensures the fluency during drilling, prevents the chip and the hole wall from friction and squeezing and scratches the hole wall caused by the difficulty of chip removal, and reduces the shortening of its life.
In the maintenance of twist drills, pay attention to ensuring sufficient cooling and using metal cutting fluid after use; the rigidity of the drill rod and the guideway gap can improve the accuracy of drilling and the life of the drill; even if the iron filings on the drill body are removed to ensure The stability of the workpiece; when drilling thin plates, the workpiece should be reinforced; when drilling large workpieces, ensure that the magnetic base and the workpiece are smooth and clean.