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Pin type insulator

 A pin type insulator consists of a nonconducting material such as porcelain, glass, plastic, polymer, or wood that is formed into a shape that will isolate a wire from a physical support (or "pin") on a telegraph ,utility pole  or other structure, providing a means to hold the insulator to the pin and secure the conductor to the insulator. Unlike a strain insulator, the pin insulator is directly connected to the supporting pole. Pin insulators were utilized before 1830, predating the strain insulator. Production of pin insulators is continued today by manufacturers worldwide.

The pin insulator is designed to secure the conductor to itself. The most common way to do this is to use a wire to tie the conductor to the insulator. Another method is to design the insulator with self-typing features such as complex slots and grooves formed into the insulator. For heavy conductors, gravity can be used to help hold the conductor in place.
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