M8-1.25 X 40mm 內六角螺絲 | 按鈕頭六角驅動 | 全螺紋 | 12.9級合金鋼熱黑氧化 (200個/包)

The hex socket drive grips the Allen key cleanly with no stripping, even after torquing them down hard in a fixture plate. Threads ran smooth through tapped holes and the black oxide finish looks uniform across all 200 pieces. Solid buy for jigs and tooling.

Used a whole pack of these building out a custom jig for the shop, and every single one seated cleanly into the threaded holes without any binding. The 12.9 alloy steel gives them a solid, unyielding feel when you're torquing them down, and the black oxide finish hasn't shown a hint of wear after a

The black oxide finish on these is what sold me—even after a week on my bench they haven't picked up a speck of rust. The hex socket drive seated perfectly with my Allen wrench, and the 12.9 alloy steel feels seriously rigid. Great value for two hundred pieces.