مسمار تحديد سداسي بنقطة كوب HOLO-KROME 32186 مقاس 3/8-16 × 1-3/4 بوصة من سبيكة فولاذ مع أكسيد أسود حراري (50 حبة/عبوة)

Used these to lock a bearing collar onto a 3/8" shaft and the cup point bit in nicely without stripping, even after torquing them down hard. The hex socket drive made installation straightforward with a standard Allen key. Pack of 50 means I've got plenty left for the next job.

The hex socket drive engages perfectly with my Allen key, and the black oxide finish makes these screws look clean and professional. Exactly what I needed for securing a pulley on a motor shaft.

These set screws have a nice sharp cup point that really bites into the shaft, so I’m confident nothing will slip. The black oxide finish looks clean and should resist rust well. Took me maybe 20 minutes to install all 50, and every one threaded smoothly.