My hardware purchases include sizes beyond the M5 roof-frame fasteners. This M4 pack is a smaller metric option in the workshop kit, where keeping similar-looking pieces separated matters.
The drilled connectors and fasteners joining my added extrusion to the roof rack.
The item in my kit
I bought M4 Stainless Split Lock Washers as part of my camper van equipment.
My hardware purchases include sizes beyond the M5 roof-frame fasteners. This M4 pack is a smaller metric option in the workshop kit, where keeping similar-looking pieces separated matters.
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
Sutemribor and Aienxn offer multi-size split-washer assortments that include M4. The assortment format trades a single-size supply for several labeled compartments.
Sutemribor Split-Washer Assortment
This Sutemribor set contains stainless-steel split washers in several metric sizes. The divided box keeps the ring sizes separated.
