براغي رأس أسطوانية 1/4-28 X 1/2 بوصة | محرك سداسي برأس زر | حبيبات نايلون | ملولبة بالكامل | أسود حراري من سبائك الصلب (100/عبوة)

Used a handful of these for a jig I was building, and the hex socket drive made installation easy even in tight spots. The nylon pellet lock is a nice touch—they held firm without any loctite.

I needed some black oxide screws for a fixture build, and these fit the bill perfectly. The hex socket drive seated cleanly without any stripping, and the nylon pellet held tight after multiple adjustments.

The nylon pellet is a lifesaver for locking these screws in place on my jig—they hold tension without stripping the threads. The black oxide finish also looks sharp and seems durable so far. These 1/4-28s seated cleanly in my precision fixtures, and a hundred of them will last me a while.