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Metal Washer Styles Chart  - printable PDF chart 
 
This chart illustrates the different types of metal washers used in the fastener industry.  Most of these washers are commonly used in the metal industries.  The helical spring lock or lock washer is used to apply tension against the nuts to keep in position.  Many DYI operators do not realize there are internal and external style washers.   
 metal_washer_types0001.jpg
 
 Metal Washer Styles Chart - printable PDF chart