Din 7504 K Standard Pdf «2026 Update»
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The "K" point is designed to pierce and form threads in pre-punched or pre-drilled holes without creating chips. Unlike thread-cutting screws (which remove material), thread-forming screws (like the DIN 7504 K) displace the material of the workpiece, creating a tight, residual compressive stress around the threads. din 7504 k standard pdf
- Scope and application: The standard defines the scope and application of the K-series fasteners, including their use in various industries.
- Normative references: The standard lists the normative references, including other DIN standards and international standards.
- Terms and definitions: The standard provides definitions of terms used in the standard, such as "screw", "nut", and "washer".
- Dimensions and tolerances: The standard specifies the dimensions and tolerances of the screw and nut assemblies, including the thread diameter, pitch, and length.
- Materials and surface finish: The standard defines the materials and surface finish requirements for the fasteners, including steel, stainless steel, and other materials.
- Testing and inspection: The standard outlines the testing and inspection requirements for the fasteners, including tensile testing, hardness testing, and surface inspection.
- Marking: The bolts must be marked with the manufacturer's name, the material, and the nominal diameter.
- Packaging: The bolts are typically packaged in units of 100 or 1000.
3. Mechanical Principles of Thread Forming
- Thread range: Typically M2 to M10
- Screw types: Cheese head, countersunk head, and pan head (with cross recess or hexalobular drive)
- Point design: The “K” point has a cutting slot to create a chip-forming action, removing material to form the thread.
- Material hardness: Screws must be case-hardened to ≥ 550 HV (for sizes up to M6) to cut into steel up to 4 mm thick.