The creation of footwear arose from man's need to protect his feet, which led to improved techniques. Over time, their manufacture has been perfected with the emergence of new tools, which have brought various problems with them. The biggest problem is the cause of accidents, which is why regulatory standards (NRs) have been created to reduce them. The aim of this book is to analyse the machinery in a shoe factory in the municipality of Campina Grande in Paraíba, with an average installation area of 140 m², in order to establish protection in accordance with Regulatory Standard 12 - Safety at Work in Machinery and Equipment. The machines chosen for analysis were the hydraulic rocker arm and the heel nailer. The needs for adapting the machines in accordance with NR -12 were surveyed, using the HRN (Hazard Rating Number) tool as a method for assessing risks with regard to machine safety. It was possible to detect and assess the risks that the machines presented. After the adjustments, the machines were placed in category 1 because they did not exceed low risk.