حلقات قفل متوسطة مشقوقة M4 | فولاذ مطلي بالزنك ثلاثي التكافؤ (100 / عبوة)

Used a full pack of these on a custom bracket assembly and every washer seated perfectly without slipping sideways. The steel feels substantial enough to hold up under repeated vibration, exactly what I needed for shop equipment.

The trivalent zinc finish on these lock washers looks clean and seems more corrosion-resistant than plain steel ones I've used before. They bite into the nut nicely and held my equipment frame steady after a week of constant vibration.

Installed these on a shaky shelf bracket and the vibration issue is completely gone. The trivalent zinc coating looks clean and seems like it'll resist rust well.