M18-2.5 X 50mm 內六角螺絲 | 內六角驅動 | 全牙 | 12.9級合金鋼熱處理黑色氧化 (25入/包)

The thermal black oxide finish wiped clean easily and hasn't shown a single spec of rust after a week of sitting in my damp workshop. The hex socket drive seated perfectly in my driver without any wobble, and the full threading gripped the steel plate like a dream. These are going straight into my p

Installing these in a jig I built and the hex socket drive made tightening them in tight spots much easier than a standard bolt. The 12.9 alloy steel feels incredibly dense and high quality for the price.

The black oxide finish on these screws held up perfectly during assembly of my jig—no flaking or galling even under tight torque. The 12.9 alloy steel feels seriously robust for the price.