The wire gauge number ranging from 107 to 1 and letters ranging from A to Z. Fractional sizes are measured in inches and metric sizes are measured in millimeters. But as a rule of thumb, we want our rivets to slide in the holes freely with at most six-thousandths of an inch of diameter allowance. In this drill bit size table, standard size drill bits available in several measurement systems, you can find wire gauge number, letter, fractional and metric drill sizes. Logically, we want to use drill bits of the same size as our rivets (e.g., 1/8' drill bit for 1/8' rivets). ANSI B94.11M-1979 specifies the size standard of straight shank twist drill bits with working length from 1/64 inch to 1 inch in increments of 1/64 inch.ĭrill Size Chart/Table – Drill Bit Dimensions Chart Pilot hole size: Wood Screw Diameter: Major thread diameter is measured on the outside of the threads. Fractional-inch drill bit sizes: the drill bit sizes are written as irreducible fractions. Bolt Depot is a handy resource, and has lots of information about all different types of fasteners.They are loosely based on the Stubs Steel Wire Gauge. Drill Size Chart Author: Fastener Mart, LLC Subject: Drill Size Chart Keywords: Drill bit sizes, wire gauge drill sizes, fractional drill sizes, letter drill sizes, metric drill sizes. Number and letter gauges do not follow a formula or standard increments. You’d use a 9/64-inch bit for a straight pilot hole, although some softwoods might benefit from having a 1/8-inch bit. When your project uses hardwood or softwood, a standard 10 wood screw is suitable for the fastening work. Number and letter gauge drill bit dimensions are often used for twist drill bits rather than other drill forms, and are still in common use in the U.S. If you are using 10 hammer drive or U-drive screws, the recommended drill bit size for your pilot hole is 20. Smaller sizes will be listed in the drill dimensions chart, but those are rarely encountered in practice. The chart has drill bit sizes extending from small 1mm bits throughout to massive 1 inch (25mm) bits. For instance, a 1/4 inch drill bit is nearest in size to a 6.5mm drill bit. Number and letter gauge drill bit sizes: the number drill bit gauge sizes range from size 80 (the smallest) to size 1 (the largest) followed by letter gauge size A (the smallest) to size Z (the largest). The chart shows a thorough rundown of metric and imperial drill bit scales alongside the proportionate sizes in the other estimation framework.
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