Din 7504 K Standard Pdf May 2026

The Complete Guide to the DIN 7504 K Standard: Thread-Forming Screws for Metals (PDF Access Included)

Option 2: Free Alternatives – Manufacturer Technical Data Sheets

Since obtaining the paid PDF can be expensive for a one-time project, many fastener manufacturers publish equivalent data that aligns with DIN 7504 K. Look for technical bulletins from:

  • EJOT (their Delta PT screw line)
  • Arnold Uebinger (TAPTITE 2000®)
  • Phillips Screw Company
  • Bossard (Bossard Assembly Technology Guides)

These documents are often free PDFs and contain the critical hole size tables, torque values, and mechanical data that mirror the DIN 7504 K spec.

Step 1: Calculate the Correct Pilot Hole Size

This is the most critical variable. The standard recommends specific hole diameters for different materials. din 7504 k standard pdf

Formula principle: Hole diameter ≈ Pitch diameter of the screw minus a material-specific factor.

Example for M4 x 0.7 screw:

  • In steel (St 37, 1-3 mm thick): Pilot hole = 3.60 mm ± 0.05 mm
  • In aluminum (AlMg3, 2-4 mm thick): Pilot hole = 3.65 mm ± 0.05 mm

If the hole is too small → High driving torque, screw breakage.
If the hole is too large → Low pull-out resistance, thread stripping.

What is DIN 7504 K? Breaking Down the Nomenclature

Before diving into the PDF details, let’s decode the name. The Complete Guide to the DIN 7504 K

  • DIN: Deutsche Industrie Norm (German Industrial Standard), now largely harmonized with ISO (International Organization for Standardization) but still widely used in industry.
  • 7504: The specific standard number for thread-forming screws for metric ISO threads.
  • K: The critical suffix. "K" stands for Kegelkalotte (conical head) or, more specifically, for a point style. In DIN 7504, the "K" variant indicates a thread-forming screw with a tapered (cone) point.

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.