Types of Joints

   
 
Free Running-Slam (Hard Drive)
-Resistance low at start and during rundown but peaks suddenly as bolt head seats.		 
   
Compressing Gaskets (Soft Draw)
-Turning resistance gradually increases as squeeze progresses to final turn.		 
   
Self-Tapping Screws
-Initial resistance high through tapping travel, easing off until sudden (B) or gradual (A)		  
   
Sheet Metal Screws
-Starting torque builds until penetration made, then resistance slacks off until head seats.		 
   
Wood Screws
-Low resistance at start builds gradually through entire rundown until head seats.