![]() ![]() Extra length drills can be very fragile and easily broken so it's usually best to drill as deep as possible with a jobber or shorter bit before switching to an extra length drill bit. Extra Length: These are extra long drill bits (up to 18") with flutes extending the entire length of the bit. ![]() Originally designed for screw machines, many people prefer these due to their high strength and added working clearance. Screw Machine Length: Also called "stubby length", these are the shortest common drill bits.Mechanics Length: Shorter than jobber drills, mechanics length drills are named as such because they fit into tighter spaces and are less likely to break while still allowing a reasonable flute length.a 1/2" jobber drill has a flute length of 4-1/2" (nine times the diameter) with smaller drills having a larger ratio. Jobber drills vary in length according to their diameter and typically have a flute length of 9-14 times the cutting diameter, i.e. Jobber Length: These are the most common twist drills and are a good compromise between length and strength.4-1/2") while most (not all) twist drills for use in portable drills are graduated length and use a name to specify the length range: Twist drill bits for use in automated machinery have an actual length specification (e.g. Length Designations: The length of a twist drill has much to do with its rigidity - a shorter bit will be stronger and less likely to wander or break but may not have the reach needed for all jobs. They are also the most confusing due to the sheer number of size, tip, and material specifications. General Description: Twist drill bits are the most common type of drill bit and are used for everyday drilling in all types of material. We have only organized them in this fashion to make selection easier. *Note that most standard drill bits can be used in automated machinery (with the proper adapter) and most boring machine bits can be used in a portable drill or drill press (assuming the chuck is big enough). Many boring machine bits are available in right or left hand rotation. These machines require tools to assemble and disassemble the clamping mechanism. Boring Machine Bits - Typically used in automated machinery such as drill banks or CNC machines fitted with tool holders or single size collets.These machines use a key to tighten or loosen the clamping mechanism. Drill Bits - Normally used with hand held drills or drill presses fitted with standard chucks.On our web site we have divided these into two categories: TiN coated bits are suitable for drilling iron and steel as well as aluminum, magnesium, etc.ĭrill bits are generally classified as Twist Drill, Counterbore, Countersink, Flat Bottom Boring, and Specialty. TiN also provides the same benefits as black and bronze oxide. Titanium Nitride (TiN) - A more expensive coating that increases the hardness of the bit and provides a thermal barrier resulting in increased production rates and longer tool life in harder materials.Bronze Oxide - Bronze oxide increases tempering and stress relieving of the bit and is generally used alone to visually identify cobalt steel or with black oxide to identify better grades of high speed steel.Black oxide is suitable for drilling iron and steel but is not recommended for drilling aluminum, magnesium, or similar materials. Black oxide adds corrosion protection, increases tempering and stress relieving of the bit, reduces galling and chip welding, and aids in retaining drilling lubricants. Black Oxide - The most economical coating.With dozens of drill bit types and thousands of sizes to choose from we'll explain the differences and help you choose the right drill bit for your application. Basic Carbide Saw Tip Information and How To Order.Grinding Carbide- Health and safety risks.
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