غسالات مسطحة 5/16" × 1/2" قطر خارجي | سماكة .050" | فولاذ بأكسيد أسود (5000 / عبوة)

These washers are exactly the right size for my 5/16" bolts and the black oxide coating makes them look uniformly dark. For a bulk pack this large, every single one I've used so far has been cleanly punched with no burrs.

The black oxide finish on these washers is holding up perfectly in my outdoor project, no rust after a week of rain. The consistent thickness makes them stack evenly under bolts, which is great for load distribution. I'm glad I got the bulk pack of 5,000 for the price.

The 0.050-inch thickness on these washers is exactly what I needed for my bike rack bolts, and the black oxide finish gives them a nice, consistent look. They distribute pressure evenly without warping, even under heavy torque. Pack of 5,000 means I won’t be running out anytime soon for future proje