Name：Grade 12.9 British hex socket head cap screw
Material：Carbon steel
Standard: British
Size：Thread diameter - Number of threads*Thread length
For example: 1/8-40*1/4 (Thread diameter 1/8 inch - Number of threads 40*Thread length 1/4 inch) excluding head length
Length：1/4，3/8，1/2，5/8，3/4，1，1-1/4，1-1/2，1-3/4，2，2-1/4，2-1/2，2-3/4，3（Excluding head length）
