براغي تثبيت بنقطة كوب مقاس #4-40 × 1/4 بوصة | فولاذ سبائكي (350 / عبوة)

The hex socket drive on these #4-40 screws made tightening them down on a pulley shaft much easier than using a standard slotted head. All 350 pieces in the pack looked uniform and cleanly threaded.

Just finished a small gear collar project and these #4-40s grabbed the shaft exactly where I set them, the cup point digs in nicely. 350 pieces means I won't be reordering for a while, and the alloy steel feels solid for the price.

The hex socket drive on these is a nice upgrade from standard slot heads—much easier to torque down without camming out. Used them to attach a pulley to a motor shaft and they held solid with no vibration loosening. For the price of a 350-pack, you can stock up and not care if you drop one.