M12 X 40mm 帶肩內六角螺絲 | 內六角頭 | 內六角驅動 | 合金鋼 (25 / 包)

I've been using these as axle pins in a small automation rig, and the hex socket drive made installation effortless. The precision-ground shoulder gives a noticeably smooth, consistent bearing surface, and the alloy steel feels solid under load. Exactly what I needed for pivot points.

The precision-ground shoulder on these screws made them perfect for a custom jig I’m building—no wobble at all. They threaded smoothly into my M12 tapped holes without any binding. I’ll definitely order more when I need spare axles.

Used a few as pivot pins for a small mechanical assembly and the precision-ground shoulder made the fit perfectly smooth, no binding at all. The hex socket drive seated the driver firmly, and all 25 pieces came with consistent threading. Exactly what I needed for bearing surfaces.