M4-0.7 X 30mm 內六角螺絲 | 低頭內六角驅動 | 部分螺紋 | Class 10.9 合金鋼熱處理黑氧化物 (400 顆/包)

The low head profile on these socket caps let me fasten parts in tight spaces where a standard bolt head would have been too tall. The black oxide coating seems durable and helped them slide into the threads smoothly during assembly.

Used a full pack of these 30mm low head screws on a tight jig assembly, and the partial threading made alignment much easier. They torqued down smoothly with the hex drive and held firm.

The black oxide finish on these M4 screws gives them a nice, consistent look across the whole batch, and the hex socket drive makes assembly in tight spots much easier than a Phillips head. I used a full pack on a custom jig build, and every single thread engaged smoothly without any binding.