HOLO-KROME 60008 براغي غطاء مقبس #4-40 × 5/8 بوصة | رأس مسطح محرك مقبس سداسي | سبيكة فولاذ أكسيد أسود حراري (100/عبوة)

I needed a batch of precision fasteners for a small jig repair and these fit perfectly, no fuss with stripped threads. The flat heads sit flush and the socket drive held up well under my torque wrench.

The black oxide finish gives these a nice grip in my wrench, and the flat head sits flush in the jig I'm building. For a hundred of them at this price, the threading on each one looks clean and holds tight.

The #4-40 threads cut cleanly into my aluminum jig, and the flat head sits flush without any wobble. For a hundred pieces at this price, the black oxide seems evenly applied and the sockets are crisp. These are my new go-to for precision assemblies.