HOLO-KROME 08010 1/4 英吋 X 1 英吋 插座肩螺絲 | 插座頭 | 插座驅動 | 合金鋼 熱黑氧化物 (25 件/包)

The hex drive seated perfectly without any wobble, and the thermal black oxide finish looks like it'll hold up well. These work great as a pivot point in my jig, and every screw in the pack matched the 1/4" shoulder spec exactly.

The ground shoulder on these is dead-on consistent across all 25 pieces, which is what I needed for a quick axle replacement on a jig. They drive in cleanly with the hex socket, though I’d have liked a slightly lower profile head for tighter spots. Still, solid hardware for the price.

The hex socket drive fits my hex keys perfectly without any wobble, and the thermal black oxide finish seems like it will resist rust well in my shop. I used a few as axles for a small jig I built, and the precision ground shoulder spins smoothly. Exactly what I needed for precise mechanical assembl