Tornillos de cabeza hueca M12-1,75 x 65 mm | Hexágono interior | Roscado parcial | Acero aleado clase 12.9 con óxido negro térmico (50/paquete)

The partially threaded length is just right for clamping thick plates without bottoming out, and the black oxide finish gives them a clean, uniform look straight out of the pack. I’ve used about half of these on a fixture build and every one seated smoothly with no stripped threads or wobble in the

The hex socket drive gripped my Allen key perfectly with zero stripping, and the 12.9 alloy steel feels seriously solid—these are going to last in my jig setup. The partial threading gave just the right clamping depth for my fixture plates. Exactly what I needed for precision assemblies.

These bolts held my jig frame perfectly rigid during a heavy milling pass, no sign of stripping or vibration. The black oxide finish also cleaned up nicely with just a rag after cutting oil got all over them.