HOLO-KROME 61056 1/2-20 X 1-1/2" 內六角埋頭螺絲 | 內六角驅動 | 合金鋼熱處理黑氧化 (50 顆/包)

Replaced a bunch of worn fasteners in my jigs and these seated perfectly flush every time, the flat head design makes a world of difference. Threads cut clean without any binding, and the thermal black oxide finish already survived a week of oily shop use without a speck of rust.

The black oxide finish on these feels properly done—no flaking or uneven spots after I torqued them down on our fixture plates. The flat head seats flush without fuss, which is exactly what I needed for the precision assembly I’m working on.

The black oxide finish on these screws gives them a nice, durable look that resists rust during assembly. I used them for a precision fixture and the flat heads sit perfectly flush with the surface. They thread smoothly into tapped holes with no binding.