Metric thick flat washers for heavy-duty spring pin bolts, as defined in the DIN 7349 standard published by the German Institute for Standardization (DIN), are circular flat washers with a central hole, thicker than the most commonly used metric flat washers defined in the DIN 125 standard, and have a larger outer diameter. Consequently, these types of flat washers have a larger surface area and are used where larger bearing surfaces are required.
In the mentioned standard, the requirements for thick flat washers for heavy type spring pin bolts are under the following headings:
Flat washers are normally used to evenly distribute the loads of threaded bolts, screws and nuts when tightening the fastener. These extra thick flat washers are used on decks, docks and large wood projects. They add extra support to a fastener installation and possibly reduce the risk of damaging the bonded material.
Flat washers are thick plates with a rounded outer diameter and a center hole (inner diameter) drilled to match the bolt or screw size. Extra-thick flat washers can withstand the force of a stronger fastener.
The main role of flat washers is to increase the size of the bearing surface area of a screw and reduce the surface pressure applied to the fastened object. Loosening can occur when the bearing surface collapses under surface pressure, so using a flat washer to reduce surface pressure is effective. This is especially important if the contact area between the bearing surface of the screw and the fastened object is small, for example when fastening to a socket, or if the fastened object is made of a soft material such as aluminum or resin.
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 heavy type spring pin bolts, within the scope of DIN 7349 standard, with its trained and expert staff and advanced technological equipment.
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