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High-Low screws
self-tapping
American standard
Special Message
   
High-Low thread forming fasteners have a double lead thread - one high and one low. The sharp 30 degree thread angle cuts deeper into the material thus reducing the radial stress that would be generated by a conventional 60 degree thread angle form. The smaller minor diameter increases the amount of material in contact with the thread resulting in a stronger fastener with greater pull-out resistance.

   
 
 



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