براغي رأس مقبس #4-40 × 1/2 بوصة | محرك مقبس سداسي | صناعة أمريكية | خيط كامل | نحاس (100 / عبوة)

I needed brass hardware for a model train project, and the hex socket drive on these #4-40 screws made installation smooth. They threaded cleanly into my brass tubing without any binding.

Picked up a pack for a small jig I was building, and the hex socket drive made it so much easier to tighten them in tight spots than a standard slotted screw. The brass threads have a nice, smooth feel when they catch, too. Solid little fasteners for precision work.

These were exactly the right fit for the jig I was building; the hex drive makes them so much easier to install in tight spots than a slotted head.