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A socket cap screw, also known as a socket head capscrew, socket screw, or Allen bolt, is a type of cap screw with a cylindrical head and hexagonal drive hole. The term socket head capscrew typically refers to a type of threaded fastener whose head diameter is nominally 1.5 times that of the screw shank ( major ) diameter, with a head height ...
Lag screw, also called a lag bolt. 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 ...
Shoulder bolt or stripper bolt - Bolt with a broad smooth shank and small threaded section at the end used as a pivot pin or attachment point. U-bolt - Bolt shaped like the letter U where the two straight sections are threaded. A straight metal plate with two bolt holes is used with nuts to hold pipes or other round objects to the U-bolt.
Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together. The two partners are kept together by a combination of their threads' friction (with slight elastic deformation ), a slight stretching of the bolt, and compression of the parts to be held together.
This self-locking property is one reason for the very large use of the screw in threaded fasteners such as wood screws, sheet metal screws, studs and bolts. Tightening the fastener by turning it puts compression force on the materials or parts being fastened together, but no amount of force from the parts will cause the screw to turn backwards ...
Set screws can successfully hold against heavy-torque applications if the details are right. For example, endmill holders of the solid type typically use large set screws holding against flats to fasten the endmill, and heavy loads are resisted. However, small set screws without flats are prone to spinning and galling if overloaded.