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Set screw
 
 
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A set screw
Set screw

A set screw, is a type of screw generally used to secure an object within another object. It is generally fully threaded. A blind screw will generally not have an external head and will be inserted into its location by means of an internal Hex, Allen , slot, Torx, star or Phillips key or driver....
, is a type of bolt
Screw

A screw is a shaft with a helix groove or screw thread formed on its surface and provision at one end to turn the screw. Its main uses are as a threaded fastener used to hold objects together, and as a simple machine used to translate torque into linear force....
 generally used to secure an object within another object. It is generally fully threaded. A blind screw (or grub screw) will generally not have an external head and will be inserted into its location by means of an internal Hex, Allen , slot, Torx
Torx

TORX, developed by Camcar LLC of Acument Global Technologies , is the trademark for a type of screw head characterized by a 6-point star-shaped pattern ....
, star or Phillips key or driver. The set screw passes through a threaded
Screw thread

A screw thread is a helix structure used to convert between rotational and linear movement or force.A screw thread may be thought of as an inclined plane wrapped around a cylinder or cone ....
 hole in the outer object and is tightened against the inner object to prevent it from moving relative to the outer object.






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A set screw
Set screw

A set screw, is a type of screw generally used to secure an object within another object. It is generally fully threaded. A blind screw will generally not have an external head and will be inserted into its location by means of an internal Hex, Allen , slot, Torx, star or Phillips key or driver....
, is a type of bolt
Screw

A screw is a shaft with a helix groove or screw thread formed on its surface and provision at one end to turn the screw. Its main uses are as a threaded fastener used to hold objects together, and as a simple machine used to translate torque into linear force....
 generally used to secure an object within another object. It is generally fully threaded. A blind screw (or grub screw) will generally not have an external head and will be inserted into its location by means of an internal Hex, Allen , slot, Torx
Torx

TORX, developed by Camcar LLC of Acument Global Technologies , is the trademark for a type of screw head characterized by a 6-point star-shaped pattern ....
, star or Phillips key or driver. The set screw passes through a threaded
Screw thread

A screw thread is a helix structure used to convert between rotational and linear movement or force.A screw thread may be thought of as an inclined plane wrapped around a cylinder or cone ....
 hole in the outer object and is tightened against the inner object to prevent it from moving relative to the outer object. It exerts its clamp
Clamp (tool)

A clamp is a fastener to hold or secure objects tightly together to prevent movement or separation through the application of inward pressure. In the United Kingdom and Australia, the term clamp is often used instead when the tool is for temporary use for positioning components during construction and woodworking; thus a C clamp or a sa...
ing force through the bottom tip that projects through the hole rather than with a larger head that remains outside. They are used to prevent relative motion between two rotating parts, such as the movement of pulley
Pulley

A pulley is a mechanism composed of a wheel with a Groove between two flanges around the wheel's circumference. A rope, cable or belt usually runs inside the groove....
 on a shaft
Axle

An axle is a central shaft for a rotation wheel or gear. In some cases the axle may be fixed in position with a bearing or bushing sitting inside the hole in the wheel or gear to allow the wheel or gear to rotate around the axle....
. For this, a set screw is screwed into the pulley hub so that its end-point bears firmly against the shaft. The fastening action is by friction between the screw and the shaft. Typically, set screws are not efficient and so are used only for transmitting very light loads. To reduce the chance of slipping and to increase load capacity, a detent
Detent

Detent is the term for a method, as well as the actual machine, used to mechanics resist or arrest the rotation of a wheel, axle or spindle.A detent can be used to intentionally divide a rotation into discrete increments, or as in perhaps its original concept and most rudimentary form, to simply arrest rotation in one direction....
 may be drilled in the shaft into which the set screw's point enters. The detent, however, must be precisely aligned with the threaded hole prior to fastening. For longer life, they are usually made of steel and case hardened
Case hardening

Case hardening or surface hardening is the process of Hardening the surface of a metal, often a low carbon steel, by infusing elements into the material's surface, forming a thin layer of a harder alloy....
.

Set screws appear with a variety of tip types, including the following:
  • Flat Point
  • Domed Point
  • Cone Point
  • Cup Point
  • Knurled Cup Point
  • Dog Point


They also appear with a variety of drive styles, including the following:
  • Allen (hex)
  • Square head
  • Slotted
  • Bristol spline
    Bristol Wrench

    A Bristol wrench is a fastener driving tool used on Bristol set screws, both of which were created by the Bristol Wrench Company....


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