My roof-equipment hardware included M5 fasteners for the added 2020 extrusion. The washer, bolt and slot-nut choices formed separate parts of those small connections.
The drilled connectors and fasteners joining my added extrusion to the roof rack.
Why I bought it
M5 Stainless Flat Washers appears in my build materials and equipment for this work.
My roof-equipment hardware included M5 fasteners for the added 2020 extrusion. The washer, bolt and slot-nut choices formed separate parts of those small connections.
How I used it in my camper van
For the light bar, I cut an added extrusion beam and made three short drilled connectors. The rack side used quarter-twenty hardware, while the smaller 2020 extrusion used M5 hardware.
The different nuts changed the assembly sequence. A rack nut had to slide in through an opening, which meant undoing bolts I had already tightened; the smaller nuts could move and spin while I tried to start a bolt. I used an Allen key to reposition them.
The profiles and joint hardware during my roof-mount assembly.
My review
The cutting and drilling made the components, but positioning the small hardware took its own time. I recorded the difference between inserting the rack nuts and fishing the smaller nuts into place because it affected how the joint went together.
The profile, connector shape, bolt and slot nut all contributed to the assembly sequence.
Alternative products
Two alternatives to compare
The Glarks assortment provides several metric metal-washer sizes. The uxcell option changes to an M5 nylon washer, a different material and surface-contact choice from the stainless washer.
Glarks Metric Flat-Washer Assortment
This assortment groups several sizes of metric flat washers in one case. The washers use a black finish and a plain circular profile.
