• Main Menu
  • Machine Screw Diameter

    The machine screw diameter used varies because they are made to work in different ways. The following are the specifications currently accepted as standards.

    Size Guide

    Size number 000 has a .034 diameter and hole diameter of .040. Size 00 measures .047 in diameter and a .053 hole diameter. Size 0 is.060 in diameter with a .066 hole diameter. Size 1 has a diameter of .073 and a hole diameter of .080. The size 2 diameter is .086 with a hole diameter of .094. Size 3 is .099 in diameter with a hole diameter of .107. There are many other sizes used for screws.

    How Screw Sizes are Measured

    Numerous methods are used to determine screw dimensions. Among them are the length of the screw, shaft frequency threads and the threaded shaft diameter. The machine thread count and diameter are measured utilizing similar criteria. However the criteria for determining a machine screw’s length hinges on the screw head’s configuration.

    Screw Lengths

    This is determined from the point where the screw head is level with the plane it is set into. Oval and flat head machine screw lengths are measured as the screwup entire length. This isn’t the case with round-head and pan screws. Their measurement is done beginning at the head’s bottom to the screw’s threaded end. Inches are used for measuring all major screw types.

    More about Machine Screw Diameter

    Their diameters are set by the screw shank size. The shank is the part that is unthreaded just under the head. If the screw has full threading, the diameter is the same as the threaded part of the screw. If the screw is bigger than 1/4 in diameter, their measurements will be determined in fractions of an inch. If the screw is smaller, a numbered system is used. The sizes are from 4 to 14.

    What is the Thread Count?

    It measures the threads that the screw has every inch. The smaller the screw, the higher the thread count will be. The thread count is done using a measuring scale of 16 to 40. 40 is extremely fine and on small screws. 16 is a very coarse thread and is found on large screws.

    Aside from knowing the machine screw diameter, it helps to learn about the thread diameter. They are usually set at #0 to #14. The increments are .013 inch. The thread numbers for every shaft inch is the same as the frequency twist.