Tornillos de cabeza hueca M12-1,75 x 100 mm | Accionamiento hexagonal | Roscado parcial | Acero aleado clase 8.8, óxido negro térmico (50/paquete)

Used these on a custom jig for my milling setup and the black oxide finish took the grease and chips without a single rust spot. The hex drive seated perfectly with a standard Allen key, and the 100mm length gave me just enough thread engagement on a thick fixture plate.

The threads on these are cut clean and the hex socket fits my Allen key with zero wobble, which is what I care about for jig work. They're solid and hefty, and the black oxide coating hasn't shown any wear after a week of clamping and unclamping. I've used cheaper bolts before and these feel like th

The black oxide finish looks properly done—uniform and not patchy like some cheap sets I've gotten. Threads engaged cleanly on the first pass into my steel jig plate, and the hex socket drive took torque without stripping. Class 8.8 rating gives me confidence for the machine tooling I'm assembling.