The differential bolt 125.72.132 performs a key function - it tightens the left and right halves of the differential housing together:
Right box 151.72.107
Left box 151.72.106
The bolt is fixed with a castle nut M14x1.5.5918 and a cotter pin 3.2x20.397, which prevents its spontaneous unscrewing when the bridge is operating under load.
The unit in which this bolt is used is the differential assembly 151.72.013-7, installed on both the front and rear axles.
Bolt 125.72.132 is used on all tractors of the HTZ family, including models T-150, T-150K, HTZ-17221, HTZ-242K, HTZ-248K and others, equipped with a similar drive axle design.
