براغي رأس سوكيت M3-0.5 × 40 مم | محرك سداسي برأس مسطح | ملولبة جزئيًا | فولاذ سبائك من الفئة 12.9 مطلي بالزنك (200 / عبوة)

I needed partially threaded M3-40s for a jig build, and these hex socket drive screws fit perfectly. The 12.9 alloy steel feels much sturdier than the usual stainless ones, and the zinc plating hasn't chipped during tightening.

Finally, some M3 screws that actually hold a thread without chewing up the aluminum every time I assemble my jigs. The 12.9 alloy steel feels rock solid and the zinc plating looks even all over, no flaking after a few weeks of use.

The hex drive bites cleanly without stripping, which is exactly what I needed for tight spaces in a jig setup. Zinc plating looks uniform and the 12.9 alloy steel feels plenty rigid for the price. One minor nit: the bag doesn’t reseal, but at 200 pieces I’m not complaining.