M8x55mm Grade 10.9 Partially Threaded Flat Head Hex Socket Cap Screw Black 10pcs

Designed with hex socket head 10.9 grade partially Threaded countersunk Flat Head Bolt?Screws. Flat Head Socket Cap Screws length is measured in their entirety which is from the top of the head to the tip. A flat head is cone shaped for use in countersunk holes and has a flat top that fits flush with the mated surface. The internal hex drive also known as a hex-socket drive has a hexagonal slot that requires a hex key?drive. Fixing component industrial and construction fasteners. Used widely in the home ?office and factory appliance communication equipments ship assembly and other machinery industry.