Shoulder Washers  
   
Used to insulate a screw, shaft, rivet or wire from a chassis (panel).
Used as a bushing.
______________________________________________
______________________________________________

Fiber 5604
Low cost
Good mechanical properties
Fair electrical insulator (150-250 v/mil)
Not recommended for humid environments
______________________________________________
______________________________________________

Kel-F 5609
Very expensive
Good electrical insulator (530 v/mil)
Fair mechanical properties
Relatively high temperature resistance
Extremely low water absorption rate
______________________________________________
______________________________________________

Nylon 5607
Good electrical insulator (385 v/mil)
High strength
Good anti -frictional properties
Heat resistant to 300ºF
______________________________________________
______________________________________________

Phenolic (LE) 5605
Higher fabrication cost than nylon or fibre
Fair electrical insulator (225 v/mil)
Good cold flow resistance
Fair water absorption rate
Relatively hard material surface
______________________________________________
______________________________________________

Teflon 5608
Good electrical insulator (480 v/mil)
Excellent chemical and corrosion resistance
High temperature resistance
Very low water absorption rate
Excellent anti-frictional properties

 

Insulating a screw or solder lug from a chissis.
To bush and insulate a metal tube (sleve) from a plate.
Shoulder washers insulate transistor from screw and chassis.