براغي رأس أسطواني M4-0.7 × 8 مم | رأس دائري بمحرك سداسي داخلي | كامل الخيط | درجة 10.9 من سبائك الصلب مطلية بالزنك (600 / عبوة)

Finally a hex key actually fits these M4s without stripping—the socket drive is machined clean. I used them to rebuild a small jig and every screw seated perfectly.

I've been using these socket cap screws for a few jigs in my workshop and the hex socket drive makes them much easier to tighten than Phillips head alternatives. The zinc plating seems durable and they haven't shown any rust yet after a few weeks in a somewhat humid garage.

Finally, a batch of screws where every single one has clean threads and fits perfectly the first time. The hex drive engages solidly without stripping, and the zinc finish looks consistent across all six hundred.