Mechanical Reworking Operations on Fastening Systems

Mechanical reworking operations make it possible to adapt standard components or semi-finished parts to specific technical requirements, transforming them into customized fastening systems. In the industrial sector, a screw, nut, stud bolt, threaded stud or threaded component may require dimensional modifications, drilling, secondary machining, milling, grinding or thread correction. EFS coordinates dedicated machining operations for supplies of special fasteners and industrial fastening components, with the objective of responding to technical requirements not covered by standard products.

Through specific machining operations, it is possible to obtain components that are more consistent with the technical drawing, the final application or the assembly conditions. Reworking operations can be performed on raw components, semi-finished parts or standard items to be modified. This approach makes it possible to reduce lead times compared to fully special production, while still maintaining a high level of customization. EFS assesses the feasibility of the operation based on the component, material, required tolerances, volumes and intended use.

Turning is a material removal process used to precisely modify the geometry of screws, pins, stud bolts, threaded studs and other fastening elements. It can be used to create diameters, grooves, chamfers, shoulders or dedicated seats. In. In fasteners, it is often required to rework the under-head area of forged screws, in order to ensure correct matching with machined seats and compliance with the dimensional tolerances specified by the project.

Grinding is used when particularly tight dimensional tolerances or high-precision surface finishes are required. It is an operation used on pins, dowel pins and other fastening components intended for precision fits, where compliance with dimensions and geometry is essential to ensure correct assembly and proper functioning of the assembly.

Drilling makes it possible to create through holes, blind holes or dedicated holes on fastening components. It may be required for assembly, safety, lightening, lubrication, insertion of dowel pins, locking systems or other specific applications.

Secondary machining operations include corrective interventions or targeted modifications on existing components. They may involve the correction of dimensions, the adaptation of geometries, the finishing of ends, the modification of surfaces or other operations required to make the component compliant with the technical request.

Milling makes it possible to create surfaces and geometries that cannot be obtained through turning operations alone. In fasteners, it is frequently used to produce milled heads, slots, bearing surfaces or other operations specified by the technical drawing. Milled heads are used in applications where it is necessary to reduce overall dimensions or obtain a precise fit with the component seat.

Oversizing and undersizing operations mainly concern the adaptation of component diameters to the needs of the application. These reworking operations are carried out when specific fits need to be obtained, assembly tolerances need to be compensated for, or fasteners need to be adapted to seats and components with non-standard dimensions, in compliance with project specifications.

Thread chasing is used to optimize, correct or restore the thread of a component. It is an important operation when the thread must ensure correct fit, improved surface cleanliness or better functionality during assembly.

Mechanical reworking operations can be carried out based on a technical drawing, customer specification or sample. EFS analyzes the request and coordinates the most suitable operation according to the material, geometry, quantity and specified tolerances. This service is particularly useful for companies that require modified components, small series, special items or fastening systems not available in catalogues.

EFS supports the supply of fastening components reworked according to technical requirements. To assess the feasibility of the operation, technical drawings, dimensional specifications, photographs of the component or information on the final application can be provided.