M24-3 x 50mm 內六角螺絲 | 平頭內六角驅動 | 全螺紋 | 12.9級合金鋼熱處理黑氧化 (10個/包)

I’ve been using these in a jig I’m building, and the fully threaded shaft really bites into the material without any wobble. The black oxide finish looks sharp and hasn’t shown a speck of rust after a few weeks in my shop.

The hex socket drive grabbed my Allen key with zero slip, and the 12.9 alloy steel feels dense and serious in the hand. I’ve used these on a jig I’m building and the threading is clean all the way down, no binding. Black oxide looks properly done, not just painted on.

The hex socket drive gripped my bit perfectly without stripping, which is a relief for a bolt this size. They seated flush in my fixture plate with that flat head design.