HOLO-KROME 76428 M16-2 × 35mm 內六角螺絲 | 內六角驅動 | 合金鋼、熱處理黑色氧化 (25個/包)

The black oxide finish gives these a nice grip in the wrench, and the threads are cut so clean they thread into my fixture without any binding. I’ve used maybe a dozen so far for a clamping setup and every one torqued down smoothly, no chips or burrs in the hex socket.

These fit perfectly in my milling jig—the black oxide finish provides just enough corrosion resistance without adding any thickness. The hex key engagement feels solid, no wobble at all.

I needed some high-strength bolts for a jig I’m building, and these M16-2 x 35mm socket cap screws fit perfectly without any stripped threads. The alloy steel with thermal black oxide feels more durable than the standard zinc ones I’ve used before.