براغي رأس أسطواني M20-2.5 × 220 مم | محرك سداسي داخلي | ملولبة جزئيًا | فولاذ سبائكي درجة 12.9 مؤكسد أسود حراريًا (10 قطع/عبوة)

The black oxide finish on these M20 screws looks professional and the 220mm length was exactly what I needed for a jig setup. Threads are clean and the hex socket drove smoothly without any camming.

The partially threaded design on these M20 socket cap screws made aligning my jig components much easier than fully threaded bolts I’ve used before. The black oxide finish looks durable and hasn’t shown any wear after a few days of adjustments. Solid fit in my tooling setup.

These 12.9 black oxide bolts are exactly what the machine jig needed—the hex socket drive grips the Allen key without slipping, and the partial threading gave me just the right purchase for the spacer stack. Fit the M20 holes cleanly out of the packet.