Better Load Distribution
Large washer diameter reduces stress concentration and improves connection reliability.
DIN 440 Square Hole Washer
- Standard: DIN 440 Square Hole Washer(Type V)
- Material: Stainless Steel
- Size: M5-M22
- Surface Treatment: Plain, Zinc Plated
- Min Order: 5000pcs
- Sample: Free sample (after quote)
- Delivery time: 30 – 45 Days
Product Overview
Product Application
DIN 440 is a special type of large outside diameter washer with a square hole, mainly designed for timber construction, wooden structures, and heavy-duty fastening applications. Unlike standard flat washers, DIN 440 washers provide a significantly larger bearing surface, helping distribute clamping forces and prevent bolt heads or nuts from sinking into soft materials.
Manufactured according to German DIN standards, DIN 440 washers are widely used together with bolts, nuts, and threaded rods in construction, timber engineering, and structural fastening systems where high load distribution is required.
Draw
Specification
DIN 440 vs DIN 125 Flat Washer
Compared with ordinary DIN 125 flat washers, DIN 440 features:
- Much larger outside diameter
- Higher load-bearing area
- Square hole design
- Improved pressure distribution on wood materials
It is especially suitable for applications where standard washers may cause deformation or insufficient load distribution.
DIN 440 Washer
- Designed mainly for timber construction
- Large outside diameter
- Square hole design
- Higher load distribution capability
- Used for structural fastening
DIN 125 Washer
- General-purpose flat washer
- Standard round hole
- Used for machinery, equipment, and general bolt connections
Key Difference:
DIN 440 focuses on maximum load spreading in soft materials such as wood, while DIN 125 focuses on general mechanical fastening applications.
Product Advantages
Suitable for Soft Materials
Ideal for timber where standard washers may compress the surface.
Long-Term Durability
Available with corrosion-resistant coatings for outdoor and structural applications.
Common Questions
What is DIN 440 washer used for?
DIN 440 washers are mainly used for timber construction and structural fastening applications. Their large diameter helps distribute bolt loads over a wider surface area, preventing damage to wood materials.
What is the difference between DIN 440 and DIN 125 washers?
DIN 440 is a heavy-duty timber washer with a larger outside diameter and square hole, while DIN 125 is a standard flat washer designed for general mechanical fastening.
Why does DIN 440 have a square hole?
The square hole design improves positioning stability and allows the washer to work effectively with specific timber fastening systems.
Can you provide OEM manufacturing?
Yes. We offer customized dimensions, hardness requirements, coatings, laser marking, packaging, and private-label solutions.
