Adam Hall 5620 Plastic Washer Pack

These washers are for M6 rack screws that are pretty standard. They are quite a big diameter and spread the load well. The screws locate tight in the centre and don't move about so they are concentric when you tighten them up. Most importantly they won't mark your gear.

As they are quite a big diameter and slightly more so than the cheaper softer ones so you need to be careful when using on the very top or bottom of racks as it can catch on the racking. It could also overlap units when using 1U or other rack units where the holes are at the very top or bottom. There's a way around this should you come across these problems and that's by shaving a slice off. It worked for me and they still perform the job well.

It's pretty hard to rate something as simple as a plastic washer. They do their job nicely it must be said and there were no bogus examples in any of the packets that I bought.

My only word of warning for those considering these washers: these washers are best utilised when you have large rack gear (3RU or higher) where the mounting holes are centred. If you have a lot of narrow rack gear (1RU or 2RU) where the mounting holes are typically on the top and bottom edges, go for the Adam Hall 5621 Nylon Washers instead. This way your rack gear will stack properly within its designated space!