Nylon Bushing Insulator for Screw TO-3 10PCS

From the shop's description

Insulator bushings also named insulation gasket and injection molding. It is a kind of insulation material and use with heatsink which apply in fixed between screw and heating components metal to achieve the insulation to avoid the fixes screw contacting the transistor and heatsink. A= 3.7mm B= 3mm T= 2mm L= 2.5mm C= 7.7mm Package Included : 10 x Nylon Bushing Insulator for Screw TO-3