M6 X 40mm 滾花杯頭內六角止付螺絲 | 合金鋼 (250個/包)

The hex socket drive makes tightening these in tight spots so much easier than using a standard Allen key. The knurled cup point grips the surface really well without slipping.

Bought these for a fixture rebuild and the knurled cup point really bites into the shaft without stripping, which is exactly what I needed. The hex socket drive made tightening them in a cramped bracket a breeze, and all 250 arrived clean and threaded true. Solid value for the price.

I needed these for a tight machinery adjustment and the knurled cup point held firm without slipping. The alloy steel feels solid, though I wish the packaging had a reusable lid.