DIN 436 Square Washer – Standard, Features & Applications
Square Washer – Stable Load Distribution for Structural Connections
Square washers are designed to provide a wider bearing surface than standard round washers, helping to distribute load more evenly across the contact area. This structural advantage makes them especially suitable for applications involving soft materials, oversized holes, or uneven surfaces where additional support is required.
Unlike spring washers that focus on locking force, square washers primarily enhance contact stability and load spreading, reducing surface deformation and improving joint reliability over time.
Functional Role in Fastening Systems
The square shape increases surface coverage and minimizes localized stress under bolt heads or nuts. This is particularly beneficial in construction and structural assemblies where alignment tolerance and material protection are important.
Square washers are commonly used to:
Prevent fastener pull-through
Improve load transfer on thin or soft substrates
Support bolted joints with larger clearance holes
Enhance stability in structural steel and timber connections
Their geometry also helps limit washer rotation during installation, improving positioning accuracy.
|
Nominal Bolt Size (M) |
Inner Diameter (d1, mm) |
Outer Length (a, mm) |
Thickness (h, mm) |
|
M12 |
13 |
40 |
4 |
|
M16 |
17 |
50 |
5 |
|
M20 |
22 |
60 |
6 |
|
M22 |
24 |
66 |
8 |
|
M24 |
26 |
70 |
8 |
|
M27 |
30 |
75 |
8 |
|
M30 |
33 |
90 |
10 |
|
M36 |
39 |
100 |
12 |
Material Options and Durability
To meet different environmental and mechanical requirements, square washers are available in multiple material options:
Carbon steel for general structural use
Stainless steel for applications requiring corrosion resistance
Surface treatments and material grades can be selected according to project conditions such as humidity, outdoor exposure, or contact with treated wood.
Applications
● Wood construction – prevents nuts/bolts from sinking into timber
● Railway tracks & bridges – distributes heavy bolt loads
● Structural steel joints – ideal for large bolts in beams & channels
● Heavy machinery – provides strong seating surface
● Utility poles & towers – used with square-headed bolts
Why Choose DIN 436 Washers?
● Larger bearing surface vs. round washers
● Perfect for soft material fastening (wood, timber)
● Heavy-duty, durable design for structural stability
● Standardized sizes for universal compatibility
Basic Specifications (Reference)
| Item | Description |
|---|---|
| Washer Type | Square washer |
| Material | Carbon steel, Stainless steel |
| Shape | Square |
| Function | Load distribution and surface support |
| Application | Structural and general fastening |
Choosing Square Washers for Your Project
Selecting the correct washer type is essential for joint performance. Square washers are ideal when the primary requirement is support and load stability, rather than vibration resistance. When used correctly, they help extend the service life of fastened components and maintain structural integrity.
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