What is the purpose of applying grease on anchor bolts before pouring concrete?

Applying grease on anchor bolts before pouring concrete primarily serves the purpose of keeping concrete out of the threads. This is critical because if concrete gets into the threads, it can make the insertion of nuts or other fastening components difficult or even impossible after the concrete has cured. The grease acts as a lubricant, ensuring that the threads remain clean and functional, allowing for proper tensioning and securing of the bolts once the concrete has set.

This practice is essential for the ease of installation and ensuring the anchor bolts can perform their intended function without hindrance from the cured concrete. Greasing the bolts also addresses potential issues related to bolt adjustments and later maintenance if needed.