supply of hex head screw complete (consisting of 4 items) , hex head screw complete ( consisting of 4 items ) for mounting of drde bio digester system ite m 1) hexagonal head screw m16x60 (property class 10.9 to is 1367 pt3 - 2002) to is 1364 pt2 2013 2002, 2) hex nut m16 (property class 10 to is 1367 pt6-1994) to is 1364 pt3- 2002, 3) spring washer b16 -is 3063-1994 , 4) thin nut m16 property class 10 to is 1367 pt6-1994) to specn. is 1364 pt4- 2003. make - tvs/lps/unbrako [ warranty period: 12 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]