M5-0.8 x 16mm 圓柱頭螺絲 | 平頭內六角驅動 | 全螺紋 | 10.9級合金鋼 熱處理黑氧化物 (400入/包)

The hex socket drive grips perfectly with my Allen key, no stripping even when torqued down hard. The black oxide finish looks sharp on my tooling fixtures, and at 400 per pack I won't need to reorder for a long time.

I needed a batch of strong, precision screws for a jig I was building, and these 10.9 alloy steel ones are holding up great under heavy clamping. The black oxide finish feels tough and the hex socket grips the driver without slipping.

These M5 screws are the real deal for jig building—the black oxide finish looks sharp and the hex socket drive sits flush perfectly. The Class 10.9 alloy steel feels seriously tough, and having 400 in one pack means I won't run out mid-project.