What is a recommended method for locating parts relative to each other?

• A. Screws
• B. Pins
• C. Welds
• D. Adhesives

Answer: (B)

Locating parts relative to each other requires a feature that defines a precise, repeatable position that can be reused in multiple assemblies. Pins, typically dowel pins paired with tight-fitting holes, provide exact alignment by constraining the parts’ positions in both translation and rotation. This setup guides parts to a single, repeatable location and can be easily removed and reinserted for disassembly or rework, which is essential for fixtures and repeatable manufacturing. In contrast, screws mainly fasten parts and can allow some misalignment or shift; welds create a permanent bond and don’t permit returning to a precise relative position; adhesives also fix parts permanently and can creep or vary with time and temperature. So pins offer the most reliable, repeatable method for locating parts relative to each other.