Designing for Washdown: What Precision Engineering Needs to Get Right in Food Manufacturing

Posted on by Tadhg Hurley

Food production environments place a unique set of demands on precision-engineered components. High throughput, regular washdowns, chemical exposure, and strict hygiene requirements mean that “standard” engineering solutions often fall short. At MAAS Precision, we see the same issues crop up repeatedly—many of them avoidable with a bit more design foresight and process understanding.

Here are four core design principles we follow when machining components for food production environments:

1. Avoiding Dirt Traps Through Smart Geometry

Dead legs, blind holes, and internal corners that are hard to reach become immediate hygiene risks. In one recent project, we replaced a legacy bracket with a sloped design and 5mm radiused corners. It drained better during CIP (clean-in-place) cycles and reduced trapped residue. Simple, but effective.

Key takeaway:

  • Use self-draining profiles wherever possible

  • Chamfer or radius internal corners to prevent build-up

  • Avoid decorative features that serve no cleaning or mechanical function

2. Surface Finish and Material Selection Matter

304 stainless is common, but not always ideal. In high-sugar environments, we’ve found 316L offers better long-term corrosion resistance—especially in wet zones near filling or bottling equipment. We routinely finish components to ≤0.8µm Ra, as smoother surfaces reduce microbial adhesion and simplify manual and automated cleaning.

3. Single-Piece Machining Over Assembly

Fewer joins, fewer seals, fewer issues. Multi-part assemblies are harder to clean and inspect. Where possible, we machine parts from a single billet—eliminating crevices and reducing maintenance. It may require 5-axis machining or more material removal, but the hygiene benefits are significant.

4. Designing for Maintenance and Repeatability

A clean component still needs to be replaceable. We design with consistent mounting points, tool-free assembly where possible, and part numbering engraved directly into the surface. This makes life easier for technicians, especially in shift-based operations where consistency is critical.

Final Thoughts

Clean design isn’t an aesthetic—it’s a functional requirement in food manufacturing. Every bracket, housing, or fixture needs to withstand washdowns, resist corrosion, and avoid contamination risks. That doesn’t happen by accident. It happens when your precision engineering partner understands what’s at stake.

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