carriage bolt with nut 1.Size :5*50 ,5*70,5*90,6*60,6*80,10*100,10*200,10*220,12*40,12*70,12*120,12*140... 2 ... ,6*80,10*100,10*200,10*220,12*40,12*70,12*120,12*140...2. Material : stainless steel and carton steel grade 4.8 , grade 8.8 ... head and the screw (with the external thread of the cylinder) a class of two-part fasteners, nuts with the need and for fastening ...