CHASSIS MODIFICATIONS 2-13 E URO C ARGO E URO 4 - 5 2.4 Screws and nuts In general, use fixings of the same type and class as those for similar fixings on the original vehicle (Table 2.6). As a general rule, materials of class 8.8 are recommended. Class 8.8 and 10.9 screws must have been hardened and tempered. For applications of diameter 6mm, stainless steel parts are recommended. Approved finishes are Dacromet and zinc coating, as detailed in Table 2.3. A Dacromet finish is not recommended if the screws are to be subjected to welding. If space allows, use screws and nuts with flanged heads. Use self-locking nuts.
Nuts must be tightened using a torque wrench set to the correct torque setting for the fixing. Table 2.6 - Classes of resistance for screws 2.5 Characteristics of the material to be used when modifying the chassis When modifying the chassis of the vehicle, and in applications which reinforce the side members directly, the material used must correspond in quality (Table 2.7) and thickness (Table 2.8) to that of the original chassis. Should it not be possible to source materials of the thickness indicated, the next superior standard thickness may be used.
Table 2.7 - Material to be used to modify the chassis Drilling the Chassis Print 603.93.431 Base - July 2006 Revi - June 2007 Class of resistance Usage Tensile strength (N/mm2) Yield point (N/mm2) 4 Non-load bearing screws 400 320 5.8 Low resistance screws 500 400 8.8 Medium resistance screws (cross mem- bers, cleat plates, brackets) 800 640 10.9 High resistance screws (spring supports, stabilizer bars and shock absorbers) 1000 900 Steel name Tensile strength (N/mm2) Yield point (N/mm2) A5 elongation IVECO FeE420 530 420 21% Europe S420MC Germany QStE420TM UK 50F45