براغي رأس أسطوانية M6-1 × 50 مم | محرك سداسي داخلي | سنون جزئية | فولاذ سبائكي فئة 8.8 مؤكسد أسود حراريًا (300 قطعة/عبوة)

Pulled these out for a jig I’m building, and the hex socket drive made tightening them in tight spots a breeze. The heat-treated black oxide seems tough enough to handle repeated use without rust.

The partially threaded design made aligning my fixture plates much easier than with fully threaded bolts. These black oxide screws slide in smoothly and the hex socket grips the Allen key without slipping.

I used these for a custom jig project, and the hex socket drive made tightening them in tight spots much easier than a standard hex head. The 50mm length was perfect for securing thicker plates without bottoming out, and all 300 pieces had a consistent, clean thread.