براغي مجموعة كوب محززة 5/16-18 × 2-1/4 بوصة | فولاذ سبائكي (100/عبوة)

Used these to lock a pulley onto a motor shaft where a standard wrench couldn't reach, and the hex socket drive made adjustment a breeze even in that cramped spot. The knurled cup point held firm after a full day of vibration, and the alloy steel feels plenty tough for the price.

The knurled cup point grips the shaft firmly without marring it, which is exactly what I needed for a stubborn pulley setup. All 100 screws arrived with clean threads and consistent hex sockets, and at this price I’ll be stocking up again.

The hex socket drive made tightening these down in a tight bracket a breeze, and the knurled cup point held firm without slipping. Exactly what I needed for a stubborn alignment job.