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Common Threaded Fasteners

Common Threaded Fasteners

 

 

Common Threaded Fasteners

Selecting the proper fastener for a particular application is a major design consideration.  Selection is based on a variety of factors.  The designers decision is primarily based on the type (tension, shear, impact, etc.) and amount of load the fastener must withstand and whether the fastener will be subject to vibration.  The selection must also be based on cost of the fastener and assembly, as well as aesthetics.

 

  • Cap screws
  • Normally passes through a clearance hole in one member and screw into another
  • May be used on machine tools and other machines for which accuracy and appearance are important
  • Five types of American National Standard cap screw head styles
  • Machine screws
  • Similar to cap screws but are generally smaller (.060" to .750" diameter)
  • May be used in tapped holes or with nuts (nuts are normally hexagonal and used mainly on the round head, pan head, and flat head screws)
  • Particularly adapted to screwing into thin materials
  • Eight ANSI approved forms of heads

 

  • Set screws
  • Used to prevent relative motion between parts
  • Screwed into one part so that it's point bears firmly against another
  • Headless set screws are used most commonly
  • Captive screws
  • Screws that remain attached to the parent material even when disengaged from the mating part
  • Used so that the screw will not be lost and to aid in speedy assembly/disassembly
  • Tapping  screws
  • Cut or form a mating thread when driven into preformed holes
  • Bolts
  • A threaded fastener that passes through clearance holes in assembled parts and threads into a nut
  • Studs
  • Shafts threaded on both ends

Head Styles

  • The head style of the threaded fastener chosen for a particular application depends on driving equipment used (screwdriver, socket wrench, etc.), the type of joint load, and the external appearance desired.

 

  • Wood screws
  • Three types of heads available are flat, pan, and oval

Source: http://faculty.ivytech.edu/~bl-desn/dsn104/lectures/Lecture%2013-%20Common%20Fasteners.doc

Web site to visit: http://faculty.ivytech.edu

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Common Threaded Fasteners

 

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Common Threaded Fasteners

 

 

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Common Threaded Fasteners