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DIN 603

DIN 603 is a standard from the German Institute for Standardization (DIN) for flat round-head bolts with square neck. It defines the dimensions, tolerances, and mechanical properties of round-head bolts used in various mechanical and structural applications. Flat round-head bolts according to DIN 603 are available in different sizes and materials to meet diverse needs.

Characteristics and Dimensions

  • Thread sizes from M5 to M16

  • Flat round head with a square neck beneath to prevent rotation during tightening

  • Standardized dimensions ensure a reliable and uniform fit

Materials and Surface Treatments
Common materials:

  • Steel

  • Stainless steel

  • Brass
    Surface finishes for corrosion resistance include:

  • Zinc plating

  • Bluing

  • Nickel plating

Application Areas

  • Timber construction: Attaching wood components where a low-profile round head is desired

  • Mechanical engineering: Securing parts in machines and equipment

  • Furniture manufacturing: Assembling furniture parts with a clean aesthetic finish

  • Gardening: Securing fences and outdoor structures

Installation and Use
Select the appropriate size and material for maximum performance and longevity. The square neck prevents the bolt from turning when tightening the nut, enabling easy and secure assembly.

Conclusion
DIN 603 flat round-head bolts are essential fasteners in many mechanical and structural applications. Their standardized dimensions and materials ensure a reliable and safe connection for a wide range of uses.

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