Technical features and purpose of the DIN 440 standard
The DIN 440 standard regulates the parameters of extra-large washers with an increased outer diameter, optimized for use in bolted connections of heavy-duty wooden structures. Using these washers allows for a significant reduction in specific pressure on soft materials under the bolt head or nut, preventing crushing and damage to the integrity of the wood.
Sizes and design execution
The products are manufactured in two design modifications:
- Type R: washers with a round central hole.
- Type V: washers with a square hole.
Technical requirements cover the range of nominal thread diameters from M5 to M52. The products comply with accuracy class C (coarse class), which is an optimal solution for general construction tasks. Deliveries from EV Group China include fasteners with various types of anti-corrosion protection, including electro-galvanizing and hot-dip galvanizing, ensuring the durability of connections in outdoor environments.