M4-0.7 X 5mm 內六角螺絲 | 六角驅動 | 全牙 | 12.9 級合金鋼 熱處理黑氧化 (900 顆/包)

I needed a solid batch for a jig I was building, and these M4 screws have perfect thread engagement without any burs. Each one seated cleanly into the tapped holes, and the 12.9 alloy steel feels seriously tough for the size.

The black oxide finish on these M4 screws looks clean and professional, and the hex drive bit fit snugly without any wobble. Used them to secure a jig on my mill, and the 12.9 strength gives me confidence they won't strip under torque.

Came out of the box in perfect shape—the black oxide finish is consistent across all 900 pieces, and the hex drive grabs cleanly with no stripping on the first few I test-fit into a jig. They're solidly machined for the price, exactly what I needed for precision assembly work.