A wire or wire can be passed through the hole in the bolt head to prevent loosening and falling off.
Socket Head Cap Screw Alloy Steel-Drilled
Uxcell M8x19mm Round Head Hollow Screw Bolts Through Hole Bolt
• Stopper Specification: W/O, For complete product overview and details on Box Sets of Hexagon Socket Head Cap Screws see the sections below
Box Sets of Hexagon Socket Head Cap Screws
10pcs M4 Philips Cross Screw Slotted Round Head Screws Carbon
4pcs Hex Socket Hollow Screw Through Hole Bolts 3.2mm Hole Screws
SVST-M3-5 NBK Hex Socket Head Cap Vacuum Vented Screws with
Brighton-Best 3/8-16 Socket Head Cap Screw, Black Oxide Steel, 1
SVSL-M10X20, Hexagon Socket Head Cap Screw (SUS316L/with Gas Ventilation Hole) - SVSL/SVSL-PC, NBK
Socket Head Cap Screws with Hole, MISUMI