براغي رأس مقبس M30-3.5 × 220 مم | محرك مقبس سداسي | خيط جزئي | فولاد سبائك فئة 12.9 مؤكسد أسود حراري

They’re hefty at 220mm and the heat-treated alloy steel feels rock solid when I’m torquing them into my jig. The black oxide coating’s got a nice matte grip that hasn’t scratched even after a few assembly cycles. Exactly what I needed for the press tooling.

Used these for a custom jig build and the hex socket drive made tightening a breeze in tight spots. The 220mm length was just right for the application and the thermal black oxide finish seems tough.

The black oxide finish on these screws is clean and consistent, and the 12.9 alloy steel feels incredibly rigid for a 220mm length. I’m using them in a jig build, and the hex socket drive fits perfectly with no stripping even under decent torque. Very pleased with the quality for the price.