Hex Bolt DIN7990

A: The primary differences between the two standards (DIN 7990 vs. DIN 931) are that DIN 7990 is a high-strength hexagon head bolt that was designed specifically for use as the primary connection between steel structures and has a performance rating of heavy duty (type heavy duty) while DIN 931 is a type of standard hexagon head bolt that can be used for most general applications. Hexagon head bolts are often used in conjunction with nuts (and/or with embedded threads) on non-critical steel structures. Although DIN 7990 does not have an identical equivalent in terms of international standards, it may be compared to preloading applications defined within EN 14399-4, while standard hexagon nuts may be compared to ISO 4032. In North America, the major standard which covers Heavy Duty Hexagon Structural Bolts is ASME B18.302. While DIN 7990 is a national standard for Germany, GB1231 would also qualify as an equivalent standard in China.

A: The main difference between both standards is that DIN 7990 is only applicable to non-preloaded (bearing type) connections, while EN14399 was created specifically for use with preloaded (friction type) high-strength connection systems. Furthermore, both standards are recognized at the European Union level. In order to be able to consistently achieve the necessary level of preload required to create a strong connection within the structure, EN14399 states that bolts, nuts, and washers must be utilized as a combined and tested assembly.