The DIN 462 standard, published by the German Institute for Standardization (DIN), describes the requirements for internal tab washers by material, coating and size.
Tab washers are mechanical locking washers with one or more internal or external notches or protrusions designed to hold the nut in place relative to the bolt or stud. The tab washer is fitted between the bolt head/nut and the mating surface, and after the connection is tightened, the tabs are tightened to engage the slots or keyways to provide a positive locking feature. After the bolt is tightened, the tab of the washer is slammed around the bolt head/nut to lock it in place and prevent any rotation.
Claw washers are produced in metric diameters ranging from M8 to M100, steel or stainless steel material. These washers are offered to consumers in surfaces or coatings ranging from plain or zinc/transparent.
In short, tab washers are a mechanical locking solution that secures bolted connections using a physical barrier. The stamp itself is a thin piece of metal, usually rectangular or circular. The biggest drawback is the complicated assembly method.
A distinctive feature of these washers is that they are designed for slotted round nuts conforming to the DIN 1804 standard (Slotted round nuts for DIN 1804 hook wrenches).
The requirements for internal tab washers by material, coating and size are included in the DIN 462 standard under the following headings:
Internal lock washers are designed for use in critical assemblies such as military vessels and power plants, and in heavy equipment where they prevent bolts from loosening. Lock washers with internal claws are also used in environments with extreme heat or constant vibration.
Our organization, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, also provides testing services for internal tab washers according to material, coating and size, within the scope of DIN 462 standard, with its trained and expert staff and advanced technological equipment.
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