bolts and nuts 1.material:40Cr, 35CrMo 2.surface:zinc plated,phosphated 3.size:M8-M48 4.grade:8.8,10.9,12. Bolts and nuts:Mechanical Properties1, Material: 40 Cr.2, Tensile strength: Mpa quartile 1220 (magnitude 12.9) .3, Tension loading: N quartile 40600 N.4, Adjusting quality: HRC34 °- 39 °.In add:But according to the clients sample production .TRACK BOLT & NUT list PART no.PART ...