5/16-18 x 1-1/4" 滾花杯頭內六角止付螺絲 | 合金鋼 (100 顆/包)

These little set screws have a nice, sharp knurl on the cup point that bit into the shaft perfectly. They torqued down much better than the smooth ones I've used before.

I was pleasantly surprised at how easily the hex socket drive let me tighten these in a tight corner on my jig. The alloy steel feels solid, and the 1-1/4 inch length was perfect for my project.

The knurled cup point grips way better than the flat-tip set screws I've used before, and the hex socket made tightening them in a cramped bracket a breeze. All 100 arrived clean and threaded smoothly, so I didn't have to chase a single one with a tap. Solid buy for the price.