Carriage Bolt  DIN603-81, BS4933, AS B108, AS1390, GB/T 794-93

1.Standard: BS 4933                                                                                                         
  Specification: M5~M20  
  Grade: 4.6 / 4.8 / 6.8 / 8.8
2.Standard: AS B108
  Specification: 1/4, 5/16, 3/8, 7/16, 1/2, 5/8, 3/4
  Grade: 2 / 5 / 8
3.Standard: AS 1390
  Specification: M5~M20
  Grade: 4.6 / 4.8 / 6.8 / 8.8
4.Standard: DIN603-81
  Specification: M5~M20
  Grade: 4.6 / 4.8 / 6.8 / 8.8
5.Standard: GB/T 794-93
  Specification: M6~M20
  Grade: 4.6 / 4.8 / 6.8 / 8.8                                                                               

Length or other specifications can be designed.