The washer's outside size is a separate choice from the screw thread. This black fender-washer pack is part of my purchased hardware range for comparing those contact footprints.
The drilled connectors and fasteners joining my added extrusion to the roof rack.
The item in my kit
I bought binifiMux Black M6 Fender Washers as part of my camper van equipment.
The washer's outside size is a separate choice from the screw thread. This black fender-washer pack is part of my purchased hardware range for comparing those contact footprints.
Where it fits my build
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 build notes
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 stainless M6 pack uses a smaller outside diameter. The Glarks assortment adds other metric sizes rather than concentrating on one wide washer.
M6 Stainless Flat Washers
These stainless flat washers are grouped for M6 fasteners. Their continuous disks provide a bearing surface between the fastener and adjoining part.
