Fasteners & Mounting · My build kit

M4 Stainless Flat Washers

The roof assemblies made the differences between screws, washers and slot hardware easy to see. This M4 flat-washer pack is another size in my purchased fastening supplies.

By · Camper Van Freedom

Read my build notes ↓

The Item in My Kit

I bought M4 Stainless Flat Washers as part of my camper van equipment.

The roof assemblies made the differences between screws, washers and slot hardware easy to see. This M4 flat-washer pack is another size in my purchased fastening supplies.

Separating Washer Size from the Material Choice

  1. I assembled the light-bar beam with drilled connectors.
  2. The smaller extrusion used M5 hardware and the rack used quarter-twenty fasteners.
  3. My wider hardware purchases included dedicated M4 flat washers alongside other sizes and materials.
The profiles and joint hardware during my roof-mount assembly.
The profiles and joint hardware during my roof-mount assembly.
The drilled connectors and fasteners joining my added extrusion to the roof rack.
The drilled connectors and fasteners joining my added extrusion to the roof rack.

My Takeaway from This Job

The roof assembly brought several hardware families to the work area. This M4 pack keeps one metal-washer size together; Glarks adds several metal sizes, while Sutemribor changes the contact material to nylon.

A single metal-washer size and a mixed nylon assortment change two attributes at once.

Product Details And Van-Build Uses

SpecificationProduct Detail
Fastener SizeM4
MaterialStainless steel
ProfileContinuous flat disk

A flat washer surrounds the fastener shank and adds a contact footprint beneath the head or nut. Record its outside diameter as well as the M4 size when planning a small van bracket. The available flat area can be limited by bends, panel edges or the nearby screw positions. Keep these continuous disks separate from the M4 split washers so the parts list shows the actual washer shape used at each position in the joint.

Exact Retailer Product Reference

Related Build-Kit Reference: M4 Stainless Split Lock Washers

What Does The M4 Label Leave To Measure?

The actual outside diameter and thickness still matter when laying out the contact surface.

Alternative products

Two Alternatives to Compare

Glarks provides a multi-size metal-washer assortment. Sutemribor changes the material to nylon and includes several sizes, creating a different contact surface.

ProductWhat distinguishes itPurchase link
M4 Stainless Flat WashersOne M4 size in stainless flat disksView on Amazon
Glarks Metric Flat-Washer Assortment (alternative)Multi-size black-finish metal flat-washer assortmentView on Amazon
Sutemribor Nylon Washer Assortment (alternative)Multi-size nylon flat-washer assortmentView on Amazon
Glarks Metric Flat-Washer Assortment

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.

View on Amazon
Sutemribor Nylon Washer Assortment

Sutemribor Nylon Washer Assortment

This Sutemribor set groups nylon flat washers in several metric sizes. The divided assortment provides different hole sizes in one nonmetal washer kit.

View on Amazon

Questions from My Build

Which Hardware Sizes Appeared in the Light-Bar Mount?

Quarter-twenty hardware on the rack side and M5 hardware on the added 2020 profile.

What Slowed Down Starting the Small Bolts?

The loose nuts moved or spun in the channel and needed repositioning.

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