... ,12*40,12*70,12*120,12*140... 2. Material : steel carriage bolt with nut1.Size :5*50 ,5*70,5 ... *40,12*70,12*120,12*140...2. Material : stainless steel and carton steel grade 4.8 , grade 8.8 .3. Package : bulk ... head and the screw (with the external thread of the cylinder) a class of two-part fasteners, nuts with the need and for fastening ...