Metric thick flat washers for construction, defined in the DIN 7989 standard published by the German Institute for Standardization (DIN), are circular flat washers with a central hole, which are thicker and have a larger outer diameter than the most commonly used metric flat washers defined in the DIN 125 standard. As a result, these thick flat washers have a larger surface area and are used where larger bearing surfaces are required.
This standard consists of two parts:
The requirements for thick flat washers for steel structures are included in the DIN 7989 standard under the following headings:
Flat washers are typically used to evenly distribute the loads of threaded bolts, screws, and nuts when tightening fasteners. These extra-thick flat washers are preferred on decks, docks, and large timber projects. They provide extra support to a group of fasteners and reduce the risk of damaging the material being fastened. Extra-thick flat washers increase the force generated when tightening larger fasteners and can withstand greater load-bearing capacity. Extra-thick flat washers can handle the strength of a stronger fastener. Flat washers can be used on the bolt side, nut side, or both sides of the fastener. Generally made of steel, flat washers are finished with Grade 8 yellow zinc. Grade 8 yellow zinc fasteners offer superior corrosion resistance and strength.
Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization also provides testing services for thick flat washers for steel structures, within the scope of DIN 7989 standard, with its trained and expert staff and advanced technological equipment.
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