When rivets are unable to shear of in tensile load they are under in crushed due to this rivet hole becomes of an oval shape. Due to this, no of rivets under shear shall be equal to the no of rivets under crushing.

When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90 Degree, then they are known as crown bevel gears.

Toughness: When a huge external force is applied on a metal, the metal will experience fracture. Toughness is the ability of a metal to resist fracture. The ability of a material to resist fracture due to high impact loads, is called toughness.

The toughness of a material decreases when it is heated.

The number of slots in a 25 mm castle nut is 6.