5/8" x 8" 內六角肩螺絲 | 內六角頭 | 內六角驅動 | 合金鋼 (10/包)

These are exactly what I needed for a jig I'm building, and the precision-ground shoulder rides smooth in the bearing. The hex drive seated clean too, no wobble. I've already ordered another pack.

The precision-ground shoulder is exactly what I needed for a custom axle setup—zero runout when I checked it with an indicator. Threads were clean and the hex socket drives smoothly, so bolt-on and off was hassle-free.

The precision-ground shoulder fits my bearing surfaces perfectly, and the hex socket drive made installing these as axle pins a breeze. All ten screws came out of the package with clean threads and no burs, which I appreciated for the price.