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Similar to a wood screw, except that it is generally much larger running to lengths up to 15 in (381 mm) with diameters from 0.25–0.5 in (6.35–12.70 mm) in commonly available (hardware store) sizes (not counting larger mining and civil engineering lags and lag bolts) and it generally has a hexagonal drive head.
Insert nut, a type of en type of threaded insert for wood; Sex bolt, a type of nut with a low shoulder (flange) to provide resistance with little protrusion; T-nut, a nut that can be knocked into the back of a wood plate to provide a screw mounting hole; Wood hanger screw, a screw with machine threads in one end, and wood screw threads in the other
Lag screws (US) or coach screws (UK, Australia, and New Zealand) (also referred to as lag bolts or coach bolts, although this is a misnomer) or French wood screw (Scandinavia) are large wood screws. Lag screws are used to lag together lumber framing, to lag machinery feet to wood floors, and for other heavy carpentry applications.
A few sizes are close enough to interchange for most purposes, such as 19 mm (close to 3 ⁄ 4 inch (19.05 mm)), 8 mm (close to 5 ⁄ 16 inch (7.94 mm)) and 4 mm (close to 5 ⁄ 32 inch (3.97 mm)). In reality, a wrench with a width across the flats of exactly 15 mm would fit too tightly to use on a bolt with a width across the flats of 15 mm.
ISO 262: ISO general purpose metric screw threads — Selected sizes for screws, bolts and nuts. ISO 965: ISO general purpose metric screw threads — Tolerances [4] ISO 965-1: Principles and basic data; ISO 965-2: Limits of sizes for general purpose external and internal screw threads. ISO 965-3: Deviations for constructional screw threads
Structural bolt DIN 6914 with DIN 6916 washer and UNI 5587 nut. A threaded fastener has internal or external screw threads. [7] The most common types are the screw, nut and bolt, possibly involving washers. Other more specialized types of threaded fasteners include captive threaded fasteners, stud, threaded inserts, and threaded rods.