براغي رأس أسطوانية M6-1 × 150 مم | محرك سداسي داخلي | سنون جزئية | فولاذ سبائكي فئة 12.9 مؤكسد أسود حراريًا (50 / عبوة)

The black oxide finish on these gives them a nice uniform look straight out of the box, and the 12.9 alloy steel feels seriously solid for jig work. Threaded portion is clean and they seated perfectly into my fixtures without any binding.

I needed extra-strong bolts for a heavy-duty press fixture, and the 12.9 alloy steel handled the load without any flex. The black oxide finish is a nice bonus for corrosion resistance, and the partially threaded design made alignment much easier.

Used these to build a custom jig for our shop press and the 12.9 grade handles torque way better than the standard 10.9 stuff I'd been using. The partial thread is perfect for clamping thicker plates without bottoming out.