M22-2.5×75mm 內六角螺絲 | 六角驅動 | 12.9級合金鋼鍍鋅 (10入/包)

Used these to secure a welding fixture and the extra length gave me the bite I needed into the 75mm plate. The zinc plating seems solid and the hex drive seated without stripping.

The hex socket drive seated perfectly on my wrench with zero wobble, and the 12.9 alloy steel feels rock-solid for the jig I’m building. Zinc plating looks clean and even straight out of the package. These are exactly what my precision assembly needed.

Needed to replace the bolts on a jig that keeps loosening under vibration, and these 12.9s have held tight so far. The zinc plating looks uniform, and the hex socket drive seated cleanly. Only gripe is the packaging—a simple plastic bag with no labeling, so I had to check the threads myself.