3/8 UNF X 1 1/4 HT HEX BZP - EUROSPARE (BT606106ES)

This is a 3/8 UNF x 1 1/4 in (31 mm) bolt made by Eurospare, used to fix the flange to the shaft. It is usually replaced when it is damaged or corroded, or whenever the flange is removed and refitted.

Reference: BT606106ES