M3-0.5 x 40mm 內六角圓頭螺絲 | 平頭內六角驅動 | 全螺紋 | 18/8 不鏽鋼 (600 / 包)

Forty millimeters of fully threaded 18/8 stainless is exactly what my jig needed, and the hex socket drive bites cleanly without stripping. The whole pack of 600 arrived neatly sorted, which made sorting through them a breeze.

The hex socket drive on these 18/8 stainless screws gripped the driver perfectly on every single one—no stripped heads across the whole 600-piece batch. I used them for a precision jig build and they threaded smoothly into my tapped holes without binding.

I needed a solid batch of M3 screws for a custom jig, and these 40mm fully threaded 18/8 stainless steel ones fit the bill perfectly. The flat head sits flush in the counterbore, and the pack of 600 should last me through several projects.