حلقات قفل خارجية ذات أسنان #4 | فولاذ مطلي بالزنك ثلاثي التكافؤ (100 / عبوة)

I’ve been using these #4 lock washers on a small vibration-prone assembly, and they’ve held tight through several test runs without loosening. The trivalent zinc finish seems clean and corrosion-resistant so far. Definitely a solid choice for securing fasteners in a shaky environment.

The zinc coating on these #4 washers is consistent and smooth, no rough burrs like some packs I've bought. They held a bolt tight on a trailer hitch after a week of rough gravel roads.

Used a pack of these on a mower deck rebuild and they held fast even after a full season of heavy vibration. The trivalent zinc coating looks uniform and hasn't shown any rust yet. Exactly what I needed for a reliable lock washer.