... 8.8,9.8.. Non Standard Bolts,Non Standard Hardware,USA Bolts And Nuts.1.What’s the specification ... experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so on .2. Our company had good ... strong not break when you tighten the fasteners by wrench ,key ,bit and spanner.When head become thicker ... manufacturers,it is convenient to tighten the fasteners by wrench,,bit,key etc.3.The scrows are also ...