M16-2 x 45mm 內六角螺絲 | 平頭六角驅動 | 全螺紋 | 12.9 級合金鋼 熱處理黑色氧化 (50 個/包)

Installed these in a jig for a heavy press fixture, and the 12.9 alloy steel handled the load with zero flex. The black oxide coating already seems to resist shop grime better than plain steel.

The hex socket drive on these M16-2 screws made tightening them in a tight jig assembly so much easier than using a regular hex key. I've bought three packs now for various tooling builds, and the black oxide finish still looks clean after weeks of handling.

The black oxide finish on these screws held up perfectly when I used them in a damp shop environment on a fixture assembly. The hex socket drive seated firmly without stripping even at higher torque settings.