5/16-18 x 4 Six Lobe Flat Floor Board Screw Type F Black Phosphate KPOHC It has a hex head

It has a hex head with an indented drive for increased torque and a 1/4-20 thread size

such as in marine environments or outdoor settings

The 3/8-24 NE Nylon Insert Hex Lock Nut Zinc is a type of nut that is used to secure bolts and screws in place

Introducing the M10-1

5/16-18 x 4 Six Lobe Flat Floor Board Screw Type F Black Phosphate KPOHC It has a hex head5 16 18 x 4 Six Lobe Flat Floor Board Screw Type F Black Phosphate Size: 5 16 18 x 4 inches Material: Steel Finish: Black Phosphate Head Type: Six Lobe Flat Floor Board Drive Type: Type F Features: Six lobe drive head for increased torque and reduced cam out Flat floor board head for a flush finish Black phosphate finish for corrosion resistance Ideal for use in flooring, decking, and other wood to wood applications