Salient features :-

1.) Normally Full Case Hardness Grease Fittings / Nipples tend to harm and damage the female part due to haedened       threads of Grease Fitting / Nipple. Viral Engineers employs a process called Tip Hardening in which only the Tip of
      the Fitting / Nipple is  hardened, thereby preventing damage / replacement of the entire female part.

2.) Thread Rolled taper threads are stronger and durable due to woek hardening and toughening of threads which is not        achievable in cut thread process, as the threads become brittle on the periphery. Threads rolling process
       gives consistency in size and threads are well maintained as per gauge with smooth finish.

3.) The Riveting is done in such a manner that a Dome shape is fromed. This type of Dome Shaped Riveting
      completely covers  the spring, securing the spring in its place.