After alignment and leveling of equipment, you should torque hold down bolts to what percentage before grouting?

The correct choice emphasizes an important step in the installation process of machinery. After aligning and leveling equipment, it's crucial to apply a specific level of torque to the hold-down bolts before grouting. This ensures that the equipment remains stable and properly positioned during the grouting process.

Torquing the hold-down bolts to 50% provides sufficient clamping force to secure the equipment in place while allowing for slight adjustments if necessary. It ensures the equipment is well-supported without being overly constrained, which could potentially lead to misalignment if adjustments are needed after grouting.

Grouting fills in the gaps between the equipment and the foundation, enhancing stability and vibration resistance. If the bolts were torqued to 100% before grouting, it could introduce stress into the mounting surfaces and potentially interfere with the proper flow of grout. Therefore, achieving 50% torque before grouting strikes a balance between securing the equipment and allowing the grout to properly set without complications.