M6-1 x 18mm 內六角螺絲 | 圓頭內六角驅動 | 全螺紋 | 12.9 級合金鋼鍍鋅 (400 顆/包)

Perfect alignment on my milling fixture—the 12.9 alloy steel held up to 80 ft-lbs without any deformation, and the zinc plating resisted a splash of coolant nicely.

Used about 60 of these for a jig build so far and every single one threaded clean with no galled threads or stripped hexes. The zinc plating has a uniform, smooth finish that hasn’t shown any flaking even after some work with a steel mallet. For 400 pieces at this price, the Class 12.9 strength is h

The hex socket drive seated perfectly with my Allen key, and the zinc plating looks clean and uniform across all 400 pieces. Used them to rebuild a jig fixture yesterday and not a single one stripped or fought me on torque. Class 12.9 strength gives me real confidence these will hold up in the long