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Square head cap screws up to and including 3 ⁄ 4 inch (19.05 mm) have a head 1 ⁄ 8 inch (3.175 mm) larger than the shank; screws larger than 3 ⁄ 4 inch (19.05 mm) have a head 1 ⁄ 4 inch (6.35 mm) larger than the shank. [9] In 1919, Dyke defined them as screws that are threaded all the way to the head. [10] socket screw
Phillips drive tool and fastener sizes [3] [9] Driver size Wood screw size Machine screw size #0 #0–1 M1.6, M2 (DIN: just M1.6) or #0, #1 #1 #2–4 M2.5, M3 (DIN: also M2) or #2, #3, #4 #2 #5–9 M3.5, M4, M5 or #5–10 #3 #10–16 M6 or #12, 1 ⁄ 4 in., plus 5 ⁄ 16 in. if round-head #4 #18–24 M8, M10 or 3 ⁄ 8 in., 9 ⁄ 16 in.,
The number series of machine screws has been extended downward to include #00-90 (0.047 in = 0.060 in − 0.013 in) and #000-120 (0.034 in = 0.060 in − 2 × 0.013 in) screws; [3] however, the main standard for screws smaller than #0 is ANSI/ASME standard B1.10 Unified Miniature Screw Threads. This defines a series of metric screws named after ...
Long-shanked screw eyes are termed 'vine eyes' and are used to attach support wires to wooden fence posts when growing soft fruit or grape vines, the plants then being tied to the wires. Lag screws. Wire eye lags (also called screw thread eye bolts, eye screws, or turned/bent eye lags) have a wood screw thread for use in wood or lag anchors.
A machine screw or bolt is usually a smaller fastener (less than 1 ⁄ 4 inch (6.35 mm) in diameter) threaded the entire length of its shank that usually has a recessed drive type (slotted, Phillips, etc.), usually intended to screw into a pre-formed thread, either a nut or a threaded (tapped) hole, unlike a wood or self-tapping screw. Machine ...
A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. A screw thread is the essential feature of the screw as a simple machine and also as a threaded fastener. The mechanical advantage of a screw thread depends on its lead, which ...