M5 x 4mm 內六角肩螺絲 | 內六角頭 | 內六角驅動 | 18/8 不鏽鋼 (25 / 包)

Installed these as axles in a small custom assembly — the precision-ground shoulder made alignment dead simple. They fit perfectly into a 4mm bore with zero slop, and the 18/8 stainless hasn't shown any rust after a few weeks in a humid shop.

Had to replace a worn-out pivot on a jig, and these fit the shoulder bore perfectly with no play. The stainless finish looks clean and resisted my clumsy wrench well.

These shoulder screws are perfect for my robotics project where I needed smooth axle rotation. The precision-ground shoulder on the M5s fits perfectly in my bearings.