![]() Extra Length or Aircraft-Length Drill Bits: These are made specifically for airplanes.Taper Length Drill Bits: These drill bits are specifically designed to prep for wood screws.While jobber and mechanics-length drill bits are the most common, drill bits come in five standard length categories: What Are the Other Types of Drill Bit Lengths? If you’re drilling into something softer like wood or composite, use a jobber drill bit. If you have a hard material like granite or metal, you need to change your drill bit into a mechanics drill bit. The most important distinction, though, is the type of material. If you only have an inch or so to drill into, you need a shorter bit, a mechanics-length. With everything you know now, deciding which drill bit length to use is pretty easy! The key is to evaluate the amount of space you have to drill through, whether your surface might not require or allow drilling, and the type of material you’re drilling. So the mechanics-length drill bits are perfect for hard materials like hard metal. The shorter length helps them fit into a small space - for example, a thin piece of furniture or shelving.īecause they’re thicker and shorter, they’re also more resistant to breaking. They are designed to drill into tighter spaces or harder surfaces. Mechanics-length drill bits are shorter and stouter than a jobber length. While there are many types of drill bits, the other length option is a mechanics-length drill bit. So if a jobber-length drill bit is long, thin, and made for drilling into a softer material, what other types of drill bits are out there? The smaller the diameter, the less to patch up if you ever need to undo your work. They’re made for softer materials and don’t need to be extremely sturdy. In addition to the flutes’ added length, the body of a jobber drill bit is usually smaller in diameter than a mechanics drill bit. So if you have a reasonably standard 0.25-inch drill bit, the flute length would be around 2.5 inches. While bits can vary in this measurement, I do have a general rule of thumb: a jobber-length bit should be about ten times longer than its diameter. Jobber drill bits tend to be between 9-14 times the shank’s diameter. Jobber length is measured in comparison to the diameter of the shank. The diameter of a drill bit determines what the length will be, depending on what type. When I talk about length, I’m talking about the body or flute length. When I talk about diameter, I’m discussing the diameter of the shank. There are many other names for many other parts of a drill bit, but these are the most important for understanding the difference between a jobber and a mechanics drill bit. The deep slots that make the corkscrew and spiral towards the point are flutes. Body and Flutes: The body is the part that looks like a corkscrew. ![]() Shank: The shank is the cylindrical part at the base that you secure into your drill.They work by cutting and removing material along the spiraled channels down their sides.ĭrill bits come in fairly standard sizes and can be divided into three main parts: Drill bits are used to drill holes in many different kinds of materials. They are one of the most basic and standard tools in construction and home improvement. Believe it or not, drill bits as a tool go back to 1861. ![]()
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