Name of the hex bolts 

 Introduction hex bolts are the most widely used class of bolts, with nuts for fastening 
 Connecting the two through holes are connected with parts, components use. 

 Material carbon steel 8.8, 4.8 12.9 10.9 SUS304 SUS316 

 Standard metric: DIN933/GB5783 tooth the whole tooth rod half 
 DIN931/GB5782 thick rod and a half teeth 

 American: ANSI B18.2.1 UNC / UNF 

 Supplier specifications 
 Metric: diameter of M3 - M56 
 Length 6mm - 200mm 

 U.S.: diameter 1/4--2 " 
 Length 1/2--6-1/2 "