Washer is used to _______.

Explanation:

Washers:

• Washers are used to distribute the clamping pressure over a larger area and prevent surface damage (marking).
• They also provide an increased bearing surface for bolt heads and nuts.
• Washers are manufactured in light, medium, heavy, and extra heavy series.

Lock washers:

• A lock washer is used to prevent a bolt or nut from loosening under vibration.
• The split ring lock washer is being rapidly replaced by lock washers designed for specific applications.

Tooth-type washers:

• These washers have teeth that bite deep into both the screw head and work surface.
• Their design is such that they actually lock lighter as vibrations increase.