NJ'S BLOG

Bolted joints  are common in  steelwork  ,  and care should be taken to ensure that the correct bolts are used. Standard “black” bolts are used for normal connections, and generally carry loads in shear, but are generally specified by their  tensile  strength . Care should be taken that the specified bolts (and nuts) are not mixed with ungraded bolts that may be on site for other purposes. High strength friction grip bolts (and nuts) are made from higher-grade steel, and are torqued to transfer loads by friction between the steel members. Overview of Bolted Joints and Mechanical Properties The ISO metric  bolted joints  and their mechanical properties are presented in this section as background information.  Figure 12.1 shows the  nomenclature  for ISO metric threads. The ISO threads can be described in the form of M d × P and a coarse pitch is assumed when P is omitted in the specification. The following parameters are used...