ST Trading supplies washers to DIN standards: flat, large-diameter, timber construction and spring washers. The table helps you specify the right standard in your enquiry. Standards in our range Standard Description DIN 125 Flat washer DIN 9021 Large-diameter flat washer DIN 440 Washer for timber construction DIN 127 Split spring washer Dimensions for each standard are listed in the PDF catalogue. Catalogue Download PDF catalogue Need a quote? Send us your list of parts (standard, size, quantity) or a drawing and we will get back to you. Request a quote How to choose a washer Washers are selected by the nominal bolt diameter – the hole provides the required clearance. A flat washer (DIN 125) protects the surface and spreads the load of the head or nut. For soft materials, thin sheet or oversized holes, large-diameter washers (DIN 9021) are used, and in timber constructions large outer-diameter washers (DIN 440) limit indentation into the wood. Split spring washers (DIN 127) should not be regarded as reliable protection against self-loosening, especially under vibration. The locking method should suit the loads and the design requirements of the joint. When joining dissimilar metals, such as stainless and galvanised steel, assess the risk of galvanic corrosion – particularly where moisture is present. Frequently asked questions How do I choose the washer size? Washer size corresponds to the nominal bolt diameter, e.g. M10. Outer diameter and thickness follow the standard – large-diameter washers have a bigger outer diameter than standard flat washers. When should I use a large-diameter washer? When the load needs to be spread over a larger area – on soft materials, thin sheet or oversized holes. The choice should reflect the design requirements. Does a spring washer prevent loosening? It should not be treated as reliable protection, especially under vibration. An effective locking method is chosen for the specific joint. What information should a washer enquiry include? Standard, size, material or coating and quantity. The contact form lets you send your full parts list in one message.
