HOLO-KROME 76088 M4-0.7 X 35mm 內六角螺絲 | 內六角驅動 | 合金鋼熱處理黑色氧化 (100 / 包)

I needed longer M4 screws for a jig build, and these 35mm ones fit perfectly into the tapped holes without any binding. The hex socket drive grabbed cleanly with my Allen key, and the black oxide coating seems durable so far.

The black oxide finish on these screws is noticeably tougher than the cheaper silver ones I've used before — no chips even after torquing them down into steel. They fit perfectly into threaded holes for my small jig build.

Finally, a batch of M4 screws where every single one threaded cleanly into my jig fixture without any binding. The black oxide finish looks professional and seems to resist the light oil I use on the tooling.