براغي رأس مقبس 5/8-11 X 5" | محرك سداسي | رقعة نايلون | خيط جزئي | فولاذ سبائكي بأكسيد أسود حراري (25 / عبوة)

The nylon patch is a nice touch—my jig bolts haven't budged a millimeter under heavy vibration since I torqued them down. Black oxide finish looks clean and the threads cut smoothly into the steel.

I needed heavy-duty screws for a jig rebuild, and these 5/8-11 x 5" socket caps fit perfectly with their partially threaded design for clamping. The nylon patch on the threads holds tight without extra lock washers. A solid set of 25 for the price.

I’ve used these in a few jig builds so far, and the black oxide finish makes them slide into tapped holes smoothly. The 5/8-11 thread held tight even under heavy clamping force.