According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than

The interference may only be avoided if the addendum circles of the two mating gears cut the common tangent to the base circles between the points of tangency.

The permissible stress in the fillet weld is 100 N/mm^{2}. The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is