براغي رأس سداسية مجوفة بنقطة كوب مخددة مقاس 7/16-14 × 1-3/4 بوصة | فولاذ سبائكي (50 / عبوة)

The knurled cup point grips the shaft way better than the plain tip I used before, and the alloy steel feels solid under torque. I used a few to lock a pulley in place and they haven't budged after a week of vibration.

The hex socket drive makes these easy to tighten in tight spots, and the knurled cup point gave a secure bite. Worked perfectly for locking a pulley onto a shaft.

The knurled cup point grips way better than I expected when torquing down, and the hex socket drive made it easy to adjust even in a cramped assembly. All 50 screws came clean with no damaged threads, so I've already got them stocked for the next job.