#4-40 × 1/2" براغي ذات رأس مقبس سداسي | حبيبات نايلون | خيط كامل | سبيكة فولاذ معالجة حرارياً بالأسود (100/عبوة)

Took a chance on these for a jig I'm building and the black oxide finish looks sharp against the steel. The nylon pellet adds just enough bite that they hold position without needing threadlocker, though the #4-40 size is definitely meant for fine work.

Needed a genuine #4-40 fastener for a tiny fixture, and these fit perfectly. The hex socket drive made installation a breeze with my smallest Allen wrench.

I’ve been using these on a prototype jig, and the black oxide finish gives them a nice, uniform look while making them easy to grip with a hex key. The nylon pellet does add a little locking action, which is helpful for vibration-prone setups. Only minor thing is the threads felt slightly tight on t