HOLO-KROME 60158 3/4-10 x 1-1/2" 內六角螺絲 | 平頭內六角驅動 | 合金鋼熱處理黑色氧化 (25 / 包)

The black oxide finish on these screws handled my jig setup without a hint of rust after a week in a damp shop. Drive engagement is solid, and the 3/4-10 threads seated cleanly with a standard hex wrench. Exactly what I needed for a precision fixture rebuild.

Used three of these on a new tooling fixture and the flat head seated perfectly flush without any binding. The black oxide finish held up well against a little coolant splash during testing.

Needed a solid fastener for a jig I was building, and these socket cap screws threaded in smoothly without any stripping. The hex drive held up perfectly under torque, and the thermal black oxide finish looks tough.