4-24 x 5/16 #3HD Unslotted Indented Hex Washer High Low Screw Fully Threaded Zinc U188 and the Phillips drive makes

and the Phillips drive makes them easy to install

It is also countersunk

The bolt is 8 inches long and has a diameter of 5/8 inches

and other surfaces

The 4-40 x 3/8 Phil Flat Taptite Alternative Thread Rolling Screw is a fully threaded screw with a black oxide and wax finish

4-24 x 5/16 #3HD Unslotted Indented Hex Washer High Low Screw Fully Threaded Zinc U188 and the Phillips drive makesThe 4 24 x 5 16 #3HD Unslotted Indented Hex Washer High Low Screw Fully Threaded Zinc is a high quality screw designed for a variety of applications. It is made of durable zinc plated steel and features a fully threaded design for maximum holding power. The un slotted head has an indented hex shape that provides a secure grip for driving. The high low thread design allows for easy installation and removal, even in tight spaces. This screw is ideal for