What is the primary goal of gap inspection in lockbolt fasteners?

Gap inspection in lockbolt fasteners is crucial for ensuring the integrity and functionality of the joint. The primary goal is to identify any gaps that may indicate improper installation or misalignment. Specifically, identifying the shim that cannot slide into the gap is essential for confirming that the lockbolt has been installed correctly and that the joint is secure. This inspection helps to ensure that the fastener’s components are properly aligned to maintain the structural integrity of the assembly.

When a shim can slide into the gap, it may suggest that the fastener is not seated properly or that there are issues causing misalignment, which could lead to joint failure under load. Therefore, identifying shims that cannot slide into the gap effectively confirms that the lockbolt fastener is engaged correctly and that the joint is secure and reliable.

While ensuring consistent installation is important, the focus of gap inspection is more technical, relating to the structural soundness of the assembly rather than just installation consistency. Eliminating all gaps completely may not be feasible or necessary, as some components tolerances and design requirements could permit minimal gaps. Determining the appropriate fastener length, while important in the broader context of fastener selection and installation, is not the primary focus of gap inspection specifically.