Metric fasteners will generally be identified by markings on the bolt head and nut face The following figure displays the different types of identification that will be found on GM vehicles Most metric fasteners will be identified There are however some exceptions MANU A TU E Nutiisevn nerneserrrs sou srneneru IDENTIFACTIDN 4 I 1 i ism M L I V I 9 8 I 9 9 I r L T I I Mrreic EOLT IDENTlFlCATlGN7 NU STRENGTH V I 1976 USAGEf0NLY IDENTIFIQATION r I wl I n I II 5 V a 1 Eh A Mamie Nu ioemriricmow I Common metric fastener strength property classes are 9 8 and 10 9 with the class identification embossed on the head of each bolt Customary inch strength classes range from grade 2 to 8 with line identification embossed on each bolt head Markings correspond to two lines less than the actual grade i e grade 7 bolt willgegthibit 5 embossed lines on the bolt head Some metric nuts will be marked with single digit strength identification numbers on the nut face The following figure illustrates the different strength markings I or W Q J 1 1 1 w w w GRADE 2 GR DE 5 GRADE 7 GRADE 8 GM zoo Ml GM zao Ml GM 290 M envi soo Ml Customary inch bolts Identification marks correspond to bolt strength lncreaslngjiumbers represent increasing strength I I A N 9 sw W W W W I f I s Q1 s i I I I I Metric Bolts ldeiitlflcaitlianiilass riuhibsrs cdrf sdohil tolmlt i strength Increasing numbers represent increasing strength I G M PART DIVISION GENERAL MOTORS 00RPOR4 TIONeCl l E LROLET 14