First Pass Yield

First Pass Yield (FPY) measures the effectiveness of a manufacturing process at producing good parts on the first attempt. It calculates the ratio of units that pass inspection to the total number of units that entered the process. This metric excludes any parts that were scrapped or required rework to become acceptable. FPY provides a clear view of a process's initial quality performance.

A high FPY indicates a stable and capable production process. It means materials, machinery, and operator actions are consistently resulting in quality output. Conversely, a low FPY signals underlying problems. These can include incorrect machine setups, poor raw material quality, inadequate operator training, or flawed work instructions. Tracking FPY helps pinpoint which steps in a production line are generating the most defects.

Manufacturers use FPY to identify areas for improvement and reduce hidden factory costs. Reworking parts consumes labor, materials, and machine time that could be used for new production. By focusing on improving FPY, teams can perform root cause analysis on failures. This leads to more reliable processes, lower production costs, and higher overall product quality. Data for FPY is often collected from inspection stations on the shop floor and tracked in a Quality Management System (QMS) or Manufacturing Execution System (MES).