5/8-11 X 2-1/2" 重型六角頭螺絲 | 美國製造 | A307 B級鋼鍍鋅 | 部分螺紋 (125個/包)

The zinc coating on these bolts is even and smooth, no flaking or rough spots. Used a full dozen on a heavy equipment mount and each one seated perfectly without any binding. Solid buy for industrial work.

Threads were clean and uniform out of the box, and the zinc plating looks even across every single one of the 125. I torqued them into a steel fixture without a single stripped head or galling issue. Solid, heavy hex heads for the price.

Used about half of these to bolt down a heavy compressor base, and the zinc coating held up well against the garage floor moisture. The partial threading made it easy to get a snug fit without bottoming out the nut. Overall a solid, no-hassle fastener for the price.