Harsh Enterprises

A castellated nut, sometimes referred to as a castle nut, is a nut with slots (notches) cut into one end. The name comes from the nut's resemblance to the crenulated parapet of a medieval castle. ... This pin prevents the nut from turning and loosening.

SPECIFICATIONS (CHEMICAL & MECHANICAL )

• METRIC -
  IS 1367 PART 6

A locknut, also known as a lock nut, locking nut, prevailing torque nut, stiff nut or elastic stop nut, is a nut that resists loosening under vibrations and torque. Elastic stop nuts and prevailing torque nuts are of the particular type where some portion of the nut deforms elastically to provide a locking action.

SPECIFICATIONS (CHEMICAL & MECHANICAL )

• METRIC -
  IS 1367 PART 8