براغي رأس مقبس M12-1.75 × 55 مم | محرك مقبس سداسي | ملولبة جزئيًا | فئة 12.9 فولاذ سبيكة مطلي بالزنك (50/عبوة)

I needed some tough bolts for a jig I was building and these fit the bill perfectly—the hex socket drive made installation a breeze even in tight spots. The partial threading gave just enough grip without stripping, and they feel solid.

The 12.9 alloy steel feels properly hardened, and the zinc plating is smooth without any flaking around the threads. I used these for a jig fixture and the hex socket drive seated cleanly, no stripping under torque.

Picked up these socket cap screws for a few tooling fixtures, and the hex socket drive let me torque them down evenly without stripping. The class 12.9 alloy steel feels reassuringly durable compared to the grade 8 bolts I've used before.