غسالات قفل داخلية ذات أسنان 1/4 بوصة | فولاذ مقاوم للصدأ 410 مع أكسيد أسود (1000 / عبوة)

Used a handful of these on a trailer hitch bracket that rattles constantly, and they’ve held tight through a few hundred miles of gravel roads. The black oxide coating feels gritty and solid, and 410 stainless gives me peace of mind against corrosion.

I was worried about rust with regular washers in my damp shop, but these black oxide ones have held up perfectly after a month of use. The 410 stainless feels solid, and they bite into the fastener just as intended under vibration.

Had a few small vibration-prone spots on my equipment, and these 1/4 black oxide lock washers did the trick. The 410 stainless steel feels solid, and a full pack of 1000 should cover any future needs.