F4 Industries

The GD&T Analysis Platform for Engineering Drawings

Y CombinatorSummer 2025ActiveIndustrialsHardwareB2BIndustrial

What they do

Problem

Engineering drawings with GD&T are often interpreted inconsistently, causing unclear design intent and costly manufacturing or field errors.

Solution

F4 is a GD&T analysis platform that ingests drawings and 3D files to automatically evaluate and visualize tolerances, datums, and manufacturability readiness.

Who it's for

Mechanical engineers and manufacturing/quality teams designing and releasing parts for production.

Founders

Paul Shin

Founder

CEO & Co-Founder @ F4 | Previously Mechanical Design Engineer @ Tesla Drive Unit where I owned 6 CyberCab & SEMI production parts and led the global drive unit heat exchanger program producing 3M+ units annually | Earlier, pioneered liquid-bipropellant rocketry @ UA & UC Berkeley

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Aidan Cantu

CTO & Co-Founder

CTO & Co-Founder @ F4 | Previously Avionics Test Engineer @ SpaceX where I designed and built hardware for Raptor 3 engine testing | Earned B.S. & M.S. in Electrical Engineering in four years with minors in CS & Math

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