Value Collection - Machine Screws System of Measurement: Inch Thread Size (Inch): 5/16-18

Flat head types have flat surfaces that taper toward the screw body to allow for countersinking. The flat head lies flush against the workpiece.

Slotted drive types are used with flat-blade drivers. They have one linear slot that runs the length of the head. Drivers must be centered in the slot during tightening or they will slip out and damage the fastener.

Stainless steel is a strong, corrosion-resistant alloy with excellent resistance to heat. It is used in high-stress, outdoor and corrosive applications.