HOLO-KROME 32250 5/8-11 X 2" 先端くぼみ六角止めねじ | 合金鋼熱処理黒染め (25 / パック)

The hex socket drive made these easy to torque down in a tight spot on the mill, and the black oxide finish looks clean. Cup point gripped the keyway solid once seated. No complaints for the price on a 25-pack.

The cup point bit into the shaft exactly where I needed it, and the thermal black oxide finish made them easy to grip even with oily fingers. I’ve been through a full install on a stubborn pulley without a single stripped hex—these are holding up like they should.

The hex socket drive seated perfectly with my Allen key, and the cup point bit into the shaft just enough to hold firm without stripping. These 2-inch alloy steel screws feel solid and the black oxide coating looks clean out of the pack—exactly what I needed for a jig setup.