Shear pin


Shear pin

A shear pin is the mechanical analogue of an electric fuse. Installed in a drive train, it is designed to break in the case of a mechanical overload, preventing other, more-expensive parts of the drive train from being damaged.

A shear pin may be plain metal rod inserted through a hub and axle; the diameter of the rod is carefully chosen to allow the shearing action when the desired breakaway load is reached. A cotter pin may also be used as a low-tech shear pin.

A common use of shear pins is in the drive train of a snow blower's auger or the propellers attached to marine engines.

External links

* [http://www.powertrainsavers.com/ company specializing in sheer pins]


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • shear pin — noun : an easily replaceable pin (as the pin fixing the propeller to an outboard motor shaft) inserted at a critical point in a machine and designed to shear when subjected to excess stress called also break pin * * * shear pin noun A pin, which …   Useful english dictionary

  • shear pin — A specially designed pin that shears if equipment seizes or loads beyond design values are imposed. For example, shear pins are used in arrester barriers, where they give way when an aircraft engages them beyond a given momentum. They are also… …   Aviation dictionary

  • shear pin — /ˈʃɪə pɪn/ (say shear pin) noun a replaceable pin inserted at a critical point in a machine and designed to break off when subjected to excess stress. Also, break pin …   Australian English dictionary

  • shear pin — A cylinder shaped item that is made of a substance which will break when subject to great pressure. In this way the main component which is more expensive will not be damaged. The pin can usually be easily replace. Also see spiral wrapped pin …   Dictionary of automotive terms

  • shear pin — noun Date: circa 1931 an easily replaceable pin inserted at a critical point in a machine and designed to break when subjected to excess stress …   New Collegiate Dictionary

  • pin — A small cylinder used for fastening something or as a pivot. See bonnet pin carbon pin cotter pin dowel pin floating piston pin fulcrum pin gudgeon pin boss gudgeon pin circlip gudgeon pin end …   Dictionary of automotive terms

  • Pin tumbler lock — The pin tumbler lock is a lock mechanism that uses pins of varying lengths to prevent the lock from opening without the correct key. Pin tumblers are most commonly employed in cylinder locks, but may also be found in tubular or radial locks.… …   Wikipedia

  • Shear line (locksmithing) — In a cylinder lock, the shear line, also known as the split line in Australia, is where the inner cylinder ends and the outer cylinder begins. When a correct change key or master key is inserted in the cylinder, it will align the pin segments… …   Wikipedia

  • pin tumbler push key —   (padlock)   n.    a type of padlock that requires pushing the key inward to disengage the shackle after insertion of the key creates a shear line …   Locksmith dictionary

  • break pin — /ˈbreɪk pɪn/ (say brayk pin) noun → shear pin …   Australian English dictionary