catalogue
1403257 is a fastener known as an inverted hex screw, part of the Bossard catalogue. It is mostly used in electrical equipment and machinery, and it is made of steel, has a black oxide finish, and consists of a hex-shaped head, with a slotted drive and full coarse thread. The dimensions are M20 x 1.5 x 40mm, with a head height of 8.7mm and drive size of 9mm. It provides a strong connection and is resistant to shock, vibration, and corrosion.