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31 Grade 8 The shank length should be adapted to the material of the load. The shank should be long enough, i.e. 1.5 times the diameter for hard materials and 3 times for softer materials like aluminum and brass. The length must not be smaller than 1.5 times the diameter (e.g. M20, minimum length 30 mm). For softer material, consider a longer length and through-hole mounting with a nut and washer on the other side. The material to which the lifting point will be attached should be strong enough to withstand lifting forces without any deformation. The lifting point must be adapted to the hook size in order to be positioned correctly in the seat of the hook. Assembly: The bolt thread and the tapped hole in the load must be compatible and both in a good state. The depth of the tapping should be at least 20 % more than the shank length. The surface should be flat and perpendicular to the lifting eye shank providing full contact with the lifting eye. When a nut is screwed on the shank, it must be at least a class 8 one. Class 10 or 12 is recommended. Never use a sling as a loop between two lifting eyes. Consider the center of gravity of the load to position the lifting eyes (symmetric to the center) The tapping must be positioned at a distance of at least 3 times the shank diameter from the edge of the load. For the AL, EL and OL lifting eyes, the angle of use is limited to 30° from the axis. Over 30° the Working Load Limit will decrease drastically. We recommend to use an articulated lifting eye if the angle is over 30°. The assembly must be done by hand without any tool or lever. The lifting eye should be screwed until the base is flush with the surface of the load. For the ADA articulated lifting eye, tighten mounting screws to recommended torque. Periodically check torque because screws could loosen in extended service. Check if the hoist ring can pivot and rotate freely in all directions. The load on each hoist ring depends on the angles and should be calculated using the following formula : WLL = W N . cosß W = load weight in kg N = number of legs or hoist rings ß = angle of inclination of the leg to the vertical For the transport ring PAS, the welding should be done in accordance with DIN 5817 resp. 15429, by a qualified welder according to EN 287-1 • the thickness of the weld must be sufficient to support the load to be lifted. • the surface must be clean, free from rust, painting, grease. • the weld band must be strong enough to resist to the load. • the hook shape must follow the support shape. It is required that the products are regularly inspected and that the inspection should take place minimally in accordance with the safety standards given in the country of use. This is necessary because the products in use may be affected by wear, misuse, overloading, etc. with a consequence of deformation and alteration of the material structure. Inspection by a competent person should take place at least every six months and even more frequently when the components are used in severe operating conditions.