---
title: "Why Can Parts That Meet Their Specifications Still Fit Poorly in Assembly?"  
description: "Why Can Parts That Meet Their Specifications Still Fit Poorly in Assembly?"  
author: "Lasse Dahl"  
published: 2026-10-22  
canonical: https://answers.mindstick.com/qa/118112/why-can-parts-that-meet-their-specifications-still-fit-poorly-in-assembly  
category: "Mix Category"  
tags: ["manufacturing", "mechanical engineering", "quality control", "Product design"]  
reading_time: 1 minute  

---

# Why Can Parts That Meet Their Specifications Still Fit Poorly in Assembly?

In a manufactured assembly, each component can pass its own dimensional inspection and still be difficult to fit once several parts are put together. How does tolerance stack-up explain this, and how do engineers decide which dimensions need tighter control?

I’m interested in practical ways teams distinguish a genuine design issue from ordinary variation across production batches.


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Original Source: https://answers.mindstick.com/qa/118112/why-can-parts-that-meet-their-specifications-still-fit-poorly-in-assembly

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