My light-bar mounting notes list a split lock washer and flat washer with each quarter-twenty rack-side connection. The washers were part of the hardware stack joining the new extrusion to the roof rack.
The added light-bar beam connected to the existing rack through three short drilled mounts. I assembled the rack side with quarter-twenty bolts, lock washers and flat washers.
Hillman quarter-inch split lock washers were included in the hardware list. The smaller 2020 extrusion used M5 bolts on the other side of each mount.
Assembling the Rack-Side Washer Stack
I prepared the drilled connectors between the two extrusion profiles.
I used a split lock washer and flat washer at each quarter-inch rack-side connection.
I applied threadlocker while assembling the bolts and positioned the slot nuts before tightening.
The light bar above the rack after fitting its support assembly.The bolt and washer attachments at my extrusion connecting brackets.
My Takeaway from This Job
My notes record the bolt, both washer types and the slot nut as separate parts of the joint. The fitting sequence still mattered: adding another rack nut sometimes meant reopening hardware that was already assembled.
A small connector joined two hardware systems, with a separate washer stack on the rack side.
Product Details And Van-Build Uses
Specification
Product Detail
Size
1/4 inch
Profile
Split ring
Material
Zinc-plated steel
The offset ends distinguish this washer from the flat disks in the same hardware collection. Keep the split-ring form and zinc-plated steel identity with the quarter-inch size in the organizer. For a van bracket connection, show the selected washer in the complete fastener stack, including the screw head or nut that sits beside it. That records the physical arrangement without reducing several different washer types to a single generic quarter-inch washer label.
Record the split profile, zinc-plated steel material and quarter-inch size together.
Alternative products
Two Alternatives to Compare
Cionyce and IMScrews both offer quarter-inch stainless split washers. The Hillman item in my list uses zinc-plated steel, so the material and finish differ. All three use a split-ring form; the comparison here is the physical hardware supplied for a joint.
Product
What distinguishes it
Purchase link
Hillman Quarter-Inch Split Lock Washers
Zinc-plated steel split washers in my hardware list
These stainless-steel washers use a split-ring shape with offset ends. Their quarter-inch size provides a washer format for threaded hardware assemblies.
