Practical Engineering Tools
Practical engineering tools for calculations, checks, conversions, references, generators, and the workflow around them.
Fixed Fastener Formula
Calculate the required positional tolerance for clearance holes in a fixed fastener assembly. Applies the GD&T fixed fastener formula T = H − F to determine tolerance distribution between mating parts.
Bolt Torque Calculator
Find the recommended and maximum install torque for a fastener and the resulting bolt tension (preload), from bolt size, proof strength, and nut factor K. Preliminary (PDR-level) tool.
Tolerance Stack-Up Calculator
Build a manual 1D tolerance stack-up, 2D hole alignment check, or fastener clearance workflow with STEP assembly context, worst-case, RSS, Monte Carlo yield, and contributor impact ranking.
Engineering Copilot
Mechanical engineering copilot for DFM, machining, and manufacturing questions.
Drawing Redliner
AI drawing review: upload a drawing and get structured redline feedback.