Engineering References That Don’t Waste Your Time
Ficient Design is a collection of mechanical engineering reference tables, design guides, and tools — the kind of stuff you actually need on the job but can never find in one place.
I started this site as a young mechanical engineer who got tired of digging through textbooks and PDFs every time I needed a tap drill size or an o-ring groove depth. So I put it all in one spot. Clean tables. Clear explanations. No fluff.
What You’ll Find Here
- Thread & Fastener Data — UNC/UNF threads, tap drill sizes, hex bolt dimensions and grades, metric conversions
- O-Ring Design — Complete AS568 size tables, groove design guidelines for static seals
- Material Reference — Steel numbering systems (AISI/SAE), international grade equivalents, hardness conversions, machinability ratings
- General Shop Reference — Drill size charts, pipe thread dimensions, surface finish specs, sheet metal gauges, GD&T symbols
About the Author
I’m Michael Moussa — a mechanical engineer with a background in product design, manufacturing, and post-tensioning construction. I’ve worked across industries from defense to consumer products, and I built this site because I wanted the reference library I wished I’d had as a junior engineer.
If you find something useful here, great. If you find an error, let me know — I’d rather fix it than leave bad data floating around the internet.