System HRC bolt and nut assemblies with calibrated preload: Bolt M20X70 (EN14399-10 ,HRC,10.9) – 334 pcs. Nut M20 (EN14399-10 ,HRD,10.9) - 334 pcs. Washer d20 (EN14399-5:2005,10.9) - 658 pcs.