1/2-20 X 7" 六角頭螺絲 | 美國製造 | L9 合金鋼黃鋅 | 部分螺紋 (25 入/包)

I needed bolts long enough to fasten some heavy machinery bases, and these L9 alloy steel screws handled the torque without any flex. The yellow zinc coating has a nice consistent finish, and they threaded smoothly into the steel plates I was working with.

The heads on these Grade L9 bolts are machined dead straight, so my 12-point socket grabs them without any wobble even after several tightenings. The yellow zinc coating has held up nicely against the oil and grime in my shop, no rust spots yet after a month.

Threads cleanly with a standard socket, and the yellow zinc finish looks properly applied across all 25 pieces. The partial threading gives a solid grip without bottoming out on the shoulder. Grade L9 toughness is exactly what I needed for a heavy jig fixture.