A tab washer is used for:

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RRB ALP Mechanic Diesel 21 Jan 2019 Official Paper (Shift 1)
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  1. Fastening vibration work
  2. Avoiding vibration
  3. Self - locking
  4. Locking the nuts

Answer (Detailed Solution Below)

Option 4 : Locking the nuts
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Explanation:

Washers are of two main types:

  • Plain washers are inserted under screw heads or nuts to provide a suitable bearing area while tightening and to protect the component from damage.
  • Lock washers are used to prevent loosening due to vibrations, movements, or temperature variations.

Common types of lock washers include:

  • Spring washer
  • Snake-proof washer
  • Crinkle washer
  • Tab washer

Tab washers:

  • Tab washers can be used for locking the nuts which are located near an edge or corner.
  • These are thin metal washers designed with two or more tabs that project from the external diameter.
  • On assembly, a tab is bent against the component or sometimes into a hole in the component.
  • Other tabs are then bent up against the correctly tightened nut.
  • The deformation of the tab washer is such that it is intended to be used only once.

 F1 Krupalu Madhu 07.09.20 D1F1 Krupalu Madhu 07.09.20 D2

Spring washer:

  • Spring washers are available with single or double coils.
  • These are placed under a nut in the assembly as washers.
  • The stiff resistance offered by the washer against the surface of the nuts serves to prevent loosening.
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