M4-0,7 x 35 mm Innensechskantschrauben | Flachkopf Innensechskant | Teilgewinde | Klasse 12.9 Legierter Stahl verzinkt (400/Stk.)

Finally, a flat head screw that actually sits flush in my counterbored holes without stripping the hex socket. The partially threaded shank gave me just the right grip for clamping an aluminum fixture plate.

Perfect fit for my latest jig project, and the 12.9 grade steel gives me confidence they'll hold up under heavy clamping loads. The zinc coating on this batch looks consistent and uniform, which is a nice touch for a bulk pack. Only wish they came in a reusable container instead of the bag.

Third batch of these I've ordered for our production fixtures—the 12.9 alloy steel holds up way better than the cheaper 8.8s I used to buy, and the zinc plating keeps them from rusting in our damp shop. Threads cut clean every time, no stripped heads across all 400.