Hexalobular (6 Lobe) socket button head screws with collar fully threaded — M 8 x 16 / X40

Bossard · Screws and Bolts with Internal Drive. d1: M8 | L: 16 | d2 max.: 17,8 | d3~: 13,7 | k max.: 4,4 | c~: 1,5 | a max.: 2,5 | Hexalobular socket: X40 | t max.: 2,7 | A~: 6,75