What is the maximum slope of surfaces in contact with the bolt head and nut according to specifications?

The maximum slope of surfaces in contact with the bolt head and nut is specified as 1:20. This means that for every 20 units of horizontal distance, the surface can rise by 1 unit vertically. Maintaining this slope is crucial because it ensures that the load is transmitted evenly and effectively through the bolt and nut assembly.

Exceeding this slope can lead to various issues, such as difficulty in achieving proper torque during tightening, uneven stress distribution, and potential failure of the connection due to insufficient engagement or slippage. By adhering to the 1:20 ratio, it helps provide a stable and secure connection, ensuring the integrity and safety of the structure being bolted.

Understanding this standard is essential for anyone involved in structural steelwork, as it directly impacts the performance and safety of connections in metallic structures.