M5-0.8 x 12mm 內六角螺絲 | 低頭內六角驅動 | 全螺紋 | 10.9級合金鋼 熱處理黑色氧化 (400入)

The low-profile heads on these M5 socket cap screws let me fit them into a tight spot on my assembly jig where a standard bolt would have stuck out. The black oxide finish seems tough and they threaded cleanly into tapped holes.

I needed a solid fastener for a jig I was building, and the Class 10.9 rating on these gave me confidence they’d handle the torque. The thermal black oxide finish looks consistent across all 400 pieces, and they seated perfectly with no burs.

These are the third batch I've ordered for my jigs. The class 10.9 alloy steel holds up way better than the hardware store stuff, and the black oxide finish hasn't shown a speck of rust even after sitting in a damp shop for months. Threads cut clean every time.