Standard: ASME/ANSI B18.3; Thread Type: Full Thread, Coarse Thread UNC
Thread Size: 5/16-18; Thread Pitch: 18 TPI; Thread Part Length: 1/2 inch
Package: 12 PCS; Hex Drive Size: 3/16 inch
Head Diameter: 0.527 inch (min)- 0.547 inch (max); Head Height: 0.152 inch (min)- 0.166 inch (max)
Material: 304 Stainless Steel 18-8 that you will probably see in your house or workplace. It's used for a wide variety of home and commercial applications. Because of its slightly higher strength and wear resistance than type 316, it's also used for nuts, bolts, screws and other fasteners.