5/16 開口重型彈簧墊圈 | 鋼材鍍鋅 (1000顆/包)

Installed these on the mower deck and they held rock solid through a full afternoon of shaking over bumpy ground. The zinc plating is clean and consistent across all thousand pieces, no rust spots after a humid week. For the price, I'll definitely grab another box next time.

The zinc plating on these washers looks clean and even, and they fit perfectly on my 5/16 bolts for a tractor attachment. I used a full box on a vibrating conveyor frame and haven't had to retighten a single bolt in two weeks.

Put these on a pallet rack that's been rattling for months and the zinc coating makes them slide into place without binding. Not a single washer has loosened since I snugged them down, which is exactly what I needed for vibration-heavy spots. Solid batch of 1000, no duds in the box.