براغي رأس أسطواني M14-2 × 150 مم | محرك سداسي داخلي | جزئية الخيوط | فئة 12.9 سبيكة فولاذ مطلية بالزنك (25/عبوة)

The partially threaded length is just right for clamping thick flanges without bottoming out, and the zinc plating has held up well during assembly. I've used about half the box on jigs and tooling so far, and every single one has driven cleanly with a hex key, no stripped heads or burrs. For 12.9 a

Used these on a custom press tool I was assembling, and the Class 12.9 hardness really gives me confidence in the joint strength. The zinc plating is clean and consistent across all 25 pieces, with no burrs on the threads.

Put these in a fixture jig I was building, and the class 12.9 alloy steel feels noticeably tougher than the standard hardware I'd been using. The partially threaded design was exactly what I needed for clamping down on the work piece.