براغي تثبيت سداسية بنقطة كوب M4 × 16 مم | فولاذ مقاوم للصدأ 316 (250 / عبوة)

These hold incredibly well in our control panel brackets, even with constant vibration. The 316 stainless steel is a relief—no rust worries in this damp shop.

Finally, a set screw that doesn't strip under pressure—the 316 stainless steel feels noticeably tougher than the cheap zinc ones I've been using. The cup point bit into the shaft nicely and held tight without any slipping.

These M4 set screws fit perfectly in my DIY tool rest project and the hex socket made tightening them in tight spots effortless. The 316 stainless steel feels solid and should resist rust much better than the cheap hardware I usually buy.