1-1/4-7 x 4-1/2" 內六角螺絲 | 平頭 內六角驅動 | 合金鋼 熱處理黑色氧化

Finally got these 1-1/4-7 x 4-1/2" socket cap screws for a jig I'm building, and the thermal black oxide finish looks tough enough to hold up in my shop. The flat head design let me countersink them flush with the surface, which is exactly what I needed for a clean assembly.

The hex socket drive on these 4-1/2" cap screws gripped perfectly with my Allen wrench, and they threaded cleanly into my jig without any binding. They feel solid and well-made for the price.

The black oxide finish on these is flawless, and the hex socket drive seated perfectly with my allen wrench without any stripping. They've held up through a week of heavy use on my tooling setup, and the 4-1/2" length gives just the right grip for thick assemblies.