M8 X 16mm 內六角螺絲 | 低頭內六角驅動 | 8.8級合金鋼 (250 / 包)

The hex socket drive makes these much easier to tighten in tight spots than standard bolts. I used them on a small machinery guard and all 250 seated perfectly with no stripped heads. Seems like solid alloy steel for the price.

For jigs and tooling fixtures these are a solid pick - the low head profile clears tight spots where standard caps won't fit, and all 250 pieces came out of the bag with clean threads and a consistent black finish. Class 8.8 hardness has held up fine under repeated clamping on my drill press table w

The hex socket grabbed the Allen key cleanly on every single one of the 250 pieces I checked, no stripped corners or sloppy fits. They’re holding my fixture jig together tight under repeated clamping, and the Class 8.8 steel feels plenty sturdy for the price.