M4-0.7 x 60mm 內六角螺絲 | 六角驅動 | 部分螺紋 | 12.9級合金鋼鍍鋅 (200顆/包)

The 60mm length on these screws gives me just enough reach for the jig I'm building, and the hex drive makes assembly much cleaner than with Phillips heads. The zinc plating seems uniformly applied, no flaking or uneven spots.

Precise threads, no binding when I drove them into aluminum fixtures, and the 12.9 hardness gives me confidence they won't strip under load. The partial thread is perfect for clamping thicker plates without bottoming out. Just wish the zinc finish was a touch more matte, but that's nitpicking.

The zinc plating looks clean and even across all 200 pieces, which matters when you're using them in visible precision assemblies. Threads engage smoothly without any binding, and the hex socket drive takes torque well.