Pre-applied coatings for controlled assembly and disassembly
Purpose of a pre-applied coating for assembly and disassembly
The aim of these coatings is to ensure constant coefficients of friction and controlled torques.
How does a pre-applied coating for assembly work
The aim of every screw assembly is to convert a tightening torque Ma into a preload force Fv with as little loss as possible.
The assembly properties are influenced by the geometry and surface as well as the friction coefficients in the thread and under the head. This is particularly important in series production in order to assemble with consistent torque and therefore consistent preload. This is why VDI, VDA, DIN and OEMs also require the friction coefficient to be set.
Pre-coatings such as precote Top 100 are suitable for this, as they allow the friction coefficient to be adjusted and also prevent stick-slip and cold welding.
How does a pre-applied coating for disassembly work
The main aim of a coating for disassembly is to prevent galling due to increased friction and thus the destruction of the screws during disassembly. Especially after high temperatures during use, pre-coatings can contribute to a satisfactory disassembly process.
How does a pre-applied coating for thread-forming screws work
The coating reduces the thread forming torque during assembly, prevents slippage and galling and enables higher clamping forces with the same tightening torque.
precote Top 300 has been specially developed for thread-forming screws. It is applied partially in the thread-forming area.
Assembly and disassembly products
