5/16-18 x 1-1/8 英吋 六角頭螺絲 | 美國製造 | 8級鋼 黃鋅 | 全螺紋 (100個/包)

Used these to reassemble a piece of heavy shop equipment, and the Grade 8 steel feels noticeably tougher than the old hardware. The hex head seated easily with a socket, and all one hundred bolts were uniform without any burs or odd threads. Definitely solid for the price.

These fit perfectly on my trailer hitch bracket, and the grade 8 steel gives me confidence they’ll hold up under heavy loads. The threads are clean and started easily with a socket.

Yellow zinc coating looks even better in person, and the threads are clean enough to spin on by hand before I torqued them down. I've used cheaper Grade 5 bolts that stripped, but these Grade 8s held tight on my equipment frame.