M6 x 12mm 內六角肩螺絲 | 內六角頭 | 內六角驅動 | 合金鋼 (25/包)

I was worried the hex socket might strip under torque, but it grabbed perfectly during assembly. The precision-ground shoulder really does make a difference for smooth pivot movement. These are exactly what I needed for a small axle project.

The shoulder on these is ground so precisely that the pivot spins without any wobble at all. I've mounted a small pulley on one and it runs dead true, which is exactly what I needed for a bearing surface.

I needed a solid pivot for a small DIY build, and these M6 shoulder screws fit perfectly—the precision-ground surface is noticeably smoother than typical hardware. The hex socket drive made installation effortless with just an Allen key.