Hexagon socket head screws
DIN85 ISO7380 slotted mushroom head screws.
Metric ISO 7380 Button Head Hexagon Socket Cap Screws have a button head head with an internal hexagonal drive suited
for a hex / Allen key or wrench.
ISO 7380-2 offers a additional collar/flange that increases the head diameter thereby increasing the weight bearing surface area.
The internal drive is ideal for situations where externally wrenched screws are .