M4-0.7×60mm 圓柱頭螺絲 | 六角驅動 | 部分螺紋 | 12.9級合金鋼熱處理黑氧化物 (300件/包)

Installed these in a jig that needed a longer reach, and the 60mm length worked perfectly. The black oxide finish looks clean and durable, and the hex socket held up well under moderate torque.

Needed a deep reach for a tooling fixture I’m working on, and the 60mm length with partial threading gave me just the right grip without wasting space. The black oxide coating feels durable and hasn’t chipped during assembly. Solid value for the pack count.

The black oxide finish on these screws handled my oily shop environment without a hint of rust after three weeks of use. Each one threaded cleanly into the jig plate without binding, and the hex socket drive held the wrench securely at full torque.