DIN 931

Definition

DIN 931 refers to a standard set by the German Institute for Standardization (Deutsches Institut für Normung) for hexagon head bolts with a metric thread. This standard outlines specifications regarding the dimensions, mechanical properties, and tolerances of these bolts, ensuring uniformity and quality in engineering applications. Understanding DIN 931 is crucial as it promotes compatibility and safety in mechanical designs where such fasteners are utilized.

5 Must Know Facts For Your Next Test

1. DIN 931 bolts are commonly made from carbon steel or alloy steel and can be coated to improve corrosion resistance.
2. The standard specifies different property classes that indicate the tensile strength of the bolts, ranging from 4.6 to 12.9.
3. DIN 931 bolts are typically used in structural applications, machinery assembly, and other areas requiring high strength and reliability.
4. The dimensions of DIN 931 bolts include specific lengths and diameters that are critical for ensuring proper fit and function in engineering applications.
5. These bolts are often compared with similar standards like DIN 933, which covers hexagon head bolts with a different thread specification.

Review Questions

• How does DIN 931 contribute to the quality assurance of mechanical designs that utilize hexagon head bolts?
  • DIN 931 contributes to quality assurance by establishing standardized dimensions and mechanical properties for hexagon head bolts. By adhering to these specifications, engineers ensure that the bolts will perform reliably under specified conditions. This uniformity minimizes the risks of failures due to incompatible components and promotes safety in mechanical assemblies.
• Compare DIN 931 with ISO standards regarding their role in fastener specifications and international engineering practices.
  • DIN 931 is a national standard that focuses specifically on hexagon head bolts within Germany, while ISO standards provide a broader framework for fasteners globally. Both aim to ensure consistency in dimensions and performance; however, ISO standards often incorporate a wider range of fastener types and may be more universally recognized in international markets. This difference highlights how regional standards like DIN can complement international efforts for engineering best practices.
• Evaluate the impact of using non-compliant fasteners instead of those adhering to DIN 931 on an engineering project.
  • Using non-compliant fasteners instead of those that meet DIN 931 can lead to significant issues such as structural failure, increased maintenance costs, and potential safety hazards. Non-compliance may result in improperly fitting components that could compromise the integrity of the entire assembly. In worst-case scenarios, this could lead to catastrophic failures that pose risks not just to equipment but also to personnel, emphasizing the critical importance of adhering to established standards like DIN 931.

Related terms

Metric Thread: A standardized thread system used in engineering and manufacturing, characterized by its pitch measured in millimeters, facilitating compatibility among various components.

Fasteners:

Hardware devices used to join two or more objects together, including bolts, screws, nuts, and washers.

ISO Standards:

International standards set by the International Organization for Standardization to ensure quality, safety, and efficiency across various industries.