M6×50mm 六角穴付き止めねじ（カップポイント）| 合金鋼 (100本/パック)

The hex drive made installing these in tight spots much easier than using a standard screwdriver. The cup point grips firmly into the shaft, so I don't have to worry about them loosening under vibration.

I needed a batch of strong set screws for a jig I’m building, and these M6 x 50mm alloy steel ones fit perfectly into those tight hex socket adjustments. The cup point grips the shaft like a vise, so nothing slips during use. Exactly what I was hoping for, and the 100-pack means I’ll have plenty for

The cup point really bites into the shaft, so there’s no slipping once these are set. I used a dozen to secure a pulley in a tight motor mount and they held perfectly under load.