Vis d'assemblage à tête à six pans creux avec trou traversant, filet complet【1 à 100 pièces】 (CSHK-SUS-M6-8)

Machined to offer functions effective on vacuum equipment and vacuum containers in which gas that builds up in tap hole pilot holes needs to be eliminated. The through-hole opened in the bolt's main body works effectively when tightening the screw.