M6-1 x 140mm 內六角螺絲 | 六角驅動 | 部分螺紋 | 等級12.9 合金鋼 熱處理黑色氧化 (50個/包)

The hex drive engagement on these M6 socket cap screws feels incredibly precise, and the thermal black oxide finish seems durable. I used them to secure a base plate on a custom press fixture, and the 140mm length was perfect for the deep reach I needed without any wobble.

I used these for a tooling jig I’ve been building, and the 12.9 alloy steel feels rock-solid under clamping loads. The partial threading on the 140mm length let me get just the right grip depth without extra clearance issues.

Finally, a cap screw that doesn't strip out under high torque—these M6-1 x 140mm handles like a dream in my jig fixtures. The thermal black oxide finish feels durable and resisted scratches during assembly.