| Customization: | Available |
|---|---|
| Standard: | / |
| Length: | Taper-length |
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GuoRui building Materails & Supplies INC.
Our main company is at China, we have branch in Philippines, Singapore ,Indonesia and South African .Our main products are scaffodling
scaffolding catwalk, shoring jack ,swivel clamp, fixed clamp ,GI PIPE ,GI WIRE ,Phenolic board, plywood, cutting wheels, grinding wheels,
flap discs, diamond saw blade, drill bits
for building safety items use :safety shoes, safety harness, safety hard hat ,
It is advisably for you to choose us to mixture all the scafolding or building materials to load one full container .
Product Description
Drill Bits Carbide drill bits offer superior performance on various types of material from soft tile to glass to hard concrete. Our carbide bits have specially designed centering tips to start drilling holes easily and accurately. Tungsten carbide drill bits also feature a coating that helps you reduce heat and friction when you're drilling. Various shanks mean our carbide drill bits are suitable for rotary or impact drills and drivers as well as screwdrivers. Most carbide drill bits fit our drills universally and are available individually and in sets. We offer a wide range of carbide drill bits to provide superior performance when drilling.
A drill bit is a cutting tool used in a drill to remove material to create holes, almost always of circular cross-section. Drill bits come in many sizes and shapes and can create different kinds of holes in many different materials. In order to create holes drill bits are usually attached to a drill, which powers them to cut through the workpiece, typically by rotation. The drill will grasp the upper end of a bit called the shank in the chuck. Drills come in standardized drill bit sizes. A comprehensive drill bit and tap size chart lists metric and imperial sized drills alongside the required screw tap sizes. There are also certain specialized drill bits that can create holes with a non-circular cross-section.
Drill geometry has several characteristics:
The spiral (or rate of twist) in the drill bit controls the rate of chip removal. A fast spiral (high twist rate or "compact flute") drill bit is used in high feed rate applications under low spindle speeds, where removal of a large volume of chips is required. Low spiral (low twist rate or "elongated flute") drill bits are used in cutting applications where high cutting speeds are traditionally used, and where the material has a tendency to gall on the bit or otherwise clog the hole, such as aluminum or copper.
The point angle, or the angle formed at the tip of the bit, is determined by the material the bit will be operating in. Harder materials require a larger point angle, and softer materials require a sharper angle. The correct point angle for the hardness of the material influences wandering, chatter, hole shape, and wear rate.
The lip angle is the angle between the face of the cut material and the flank of the lip, and determines the amount of support provided to the cutting edge. A greater lip angle will cause the bit to cut more aggressively under the same amount of point pressure as a bit with a smaller lip angle. Both conditions can cause binding, wear, and eventual catastrophic failure of the tool. The proper amount of lip clearance is determined by the point angle. A very acute point angle has more web surface area presented to the work at any one time, requiring an aggressive lip angle, where a flat bit is extremely sensitive to small changes in lip angle due to the small surface area supporting the cutting edges.
The functional length of a bit determines how deep a hole can be drilled, and also determines the stiffness of the bit and accuracy of the resultant hole. While longer bits can drill deeper holes, they are more flexible meaning that the holes they drill may have an inaccurate location or wander from the intended axis. Twist drill bits are available in standard lengths, referred to as Stub-length or Screw-Machine-length (short), the extremely common Jobber-length (medium), and Taper-length or Long-Series (long).
Most drill bits for consumer use have straight shanks. For heavy duty drilling in industry, bits with tapered shanks are sometimes used. Other types of shank used include hex-shaped, and various proprietary quick release systems.
The diameter-to-length ratio of the drill bit is usually between 1:1 and 1:10. Much higher ratios are possible (e.g., "aircraft-length" twist bits, pressured-oil gun drill bits, etc.), but the higher the ratio, the greater the technical challenge of producing good work.
The best geometry to use depends upon the properties of the material being drilled. The following table lists geometries recommended for some commonly drilled materials.
| DRILL BIT FOR CONCRETE | 5/16 INCHES (8MM) |
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