ST Trading supplies nuts to DIN standards – hexagon, thin, prevailing torque (self-locking), flange, domed cap, coupling, wing, weld and tee nuts. The table helps you specify the right standard in your enquiry. Standards in our range Standard Description DIN 934 Hexagon nut DIN 936 Hexagon thin nut DIN 985 Prevailing torque nut with non-metallic insert DIN 980 All-metal prevailing torque nut DIN 6923 Hexagon flange nut DIN 1587 Domed cap nut DIN 6334 Coupling nut (extension nut) DIN 316 Wing nut DIN 928 / DIN 929 Weld nut (square / hexagon) – Tee nuts Dimensions for each standard are listed in the PDF catalogue, which also covers castle nuts (DIN 935), square nuts (DIN 557), prevailing torque flange nuts (DIN 6926, DIN 6927) and wheel nuts (DIN 74361). 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 nut The nut must match the bolt in diameter and thread pitch – coarse and fine threads are not interchangeable. Select the nut property class for the bolt class in line with the standard and the joint design – an 8.8 bolt is usually paired with a class 8 nut. Thin nuts (DIN 936) have reduced load capacity and need separate verification. Reducing self-loosening. Prevailing torque nuts are used in joints exposed to vibration. Nuts with a non-metallic insert (DIN 985) have a limited service temperature range – at elevated temperatures check the permitted range of the specific design. All-metal nuts (DIN 980) may be an alternative. Shape and assembly. A flange (DIN 6923) increases the bearing area – whether a washer can be omitted depends on the design and the materials being joined. A weld nut (DIN 928, DIN 929) lets you fit the bolt without holding the nut from the other side, which helps with thin sheet and profiles. A coupling nut (DIN 6334) joins and extends threaded rods. Frequently asked questions How do I match a nut to a bolt? Check the diameter and thread pitch and the nut class required for the bolt class. For thin nuts and designs with reduced load capacity, do not rely on a simplified rule without checking the standard. What is the difference between nylon insert and all-metal lock nuts? They create prevailing torque in different ways and have different permitted service conditions, including temperature. The choice depends on operating conditions and design requirements. Does a flange nut replace a washer? The flange increases the bearing area but does not perform every function of a washer. The decision depends on the joint design and the substrate. Can lock nuts be reused? Prevailing torque can drop after repeated assembly, especially with nylon insert nuts. For critical joints, new nuts are recommended.
