HOLO-KROME 32078 #8-32 x 3/8" 杯端止付螺絲 | 合金鋼 熱處理黑色氧化 (100 / 包)

Used a handful of these to lock a pulley onto its shaft, and the hex socket drive made seating them in tight spots painless. The thermal black oxide finish looks uniform and hasn't shown any wear after a couple of weeks. For a hundred pieces at this price, they're a solid value.

The cup point bites into the shaft exactly as intended, and the hex socket drive makes them easy to seat even in tight spots. Thermal black oxide finish looks clean and uniform across all 100 pieces.

The cup point on these bites into the shaft nicely without marring it to hell, and the black oxide finish keeps them from rusting in my humid garage. Used a dozen so far on a pulley assembly and every one seated perfectly flush.