M4-0.7 X 6mm 內六角螺絲 | 平頭內六角驅動 | 全牙 | 12.9級合金鋼鍍鋅 (900個/包)

Needed some small fasteners for a precision fixturing project, and these flat heads sit perfectly flush in the countersink without any wobble. The hex socket drive on a 12.9 grade screw gives me confidence they’ll hold up under repeated torque.

Bought these for a batch of jigs and they're exactly the right length for that application. The zinc plating looks uniform across all 900 pieces, and not a single one had a stripped or burred socket out of the box. At this price per unit, it's hard to complain about anything.

The hex socket drive made installation a breeze on my precision tooling rig, and the zinc plating seems durable enough for repeated use. I’ve already used half the pack, and every screw threads cleanly without any burrs.