M6-1 x 35mm 內六角螺絲 | 平頭內六角驅動 | 全螺紋 | 12.9級合金鋼熱處理黑氧化 (400顆/包)

The hex socket drive seated perfectly with my Allen key, no stripping even under full torque. The thermal black oxide finish gives them a solid, uniform look that should hold up well in my fixture builds. Pack of 400 means I've got plenty for future projects.

Needed to replace some worn bolts on my milling machine jig, and these 12.9 alloy steel screws fit perfectly. The black oxide finish really helps with corrosion resistance in the shop environment. Pack of 400 is great value for keeping a stocked hardware drawer.

Both heads used a 5mm hex key without any issues—the black oxide finish also resisted my greasy fingers better than expected. These are holding a jig frame together perfectly, no strip-out so far.