براغي رأس مقبس | 1/2-20 × 1-1/4 بوصة | محرك سداسي | حبة نايلون | ملولب بالكامل | فولاذ سبائك أكسيد حراري أسود (50 / عبوة)

The nylon pellet in these screws really locks them in place—no vibration loosening on my milling fixture. Finished a whole tooling setup without a single stripped head, and the black oxide coating looks sharp against the steel.

I needed a sturdy fastener for a jig I'm building, and these cap screws threaded in perfectly with a socket driver. The nylon pellet really makes a difference for holding position during assembly, and the black oxide coating looks clean and professional.

The black oxide finish on these screws held up perfectly during my fixture assembly, no chipping or galling. Driving them with a hex key into steel plate felt solid and precise, exactly what I needed for a repeatable clamp setup.