M16-2 X 50mm 內六角螺絲 | 平頭內六角驅動 | 全螺紋 | 12.9級合金鋼熱處理黑色氧化物 (50個/包)

Threads are crisp and the black oxide finish held up without a single chip when I torqued them into a steel fixture. The hex socket seated perfectly, and all 50 came out of the pack with zero debris or rough edges. Exactly what I needed for a tight assembly job.

Installed a dozen of these into my milling machine's fixture table—the hex socket drive bites perfectly without stripping. The fully threaded length gave me solid clamping force on my jig plates. Exactly what I needed for precision tooling work.

The black oxide finish is holding up perfectly after a week on my jig, no rust or wear. Threads cut clean and seated flush without any binding, and the hex socket drive took torque like a champ.