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Shaft & Keyway Sizing Calculator

Size shafts from torque loads and select ANSI standard keys and keyways per ANSI B17.1 and Machinery's Handbook

Source-aware shaft and keyway planning screen for mechanical, maintenance, and rotating-equipment review. Enter torque, optional bending moment, material prompts, safety factor, key yield, and key length to organize local shaft-diameter, key-row, shear, and bearing prompts. The local key rows are not a certified ASME B17.1 table reproduction, and the material rows are not product certifications. Verify the current standard, drawing, hub, shaft, key material, heat treatment, fatigue, fits, OEM instructions, guarding, and qualified mechanical review before design, repair, purchase, or installation use.

Pro Tip: Treat the output as a review worksheet. Keyways add notch and fatigue concerns, hub length can limit engagement, shock or reversing duty can dominate the connection, and exposed rotating shafts/couplings need guarding and lockout review. Do not convert a local key row into a final keyseat tolerance, replacement part, or safe-work instruction without current source and OEM checks.

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Shaft & Keyway Calculator
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How It Works

  1. Enter Torque and Bending Prompts

    Enter torque directly and add a bending-moment prompt only when that local combined-load screen is useful. The app does not complete fatigue, deflection, shoulder, groove, keyway-notch, or critical-speed design.

  2. Select Material Prompts

    Choose a local shaft material row and key-yield prompt to organize review. Actual material certificates, heat treatment, hardness, surface condition, corrosion, and repair history must be verified from project records or supplier data.

  3. Review Shaft Diameter Prompt

    The screen reports a local stress-based minimum and a rounded shaft prompt. It does not approve the selected shaft, hub, coupling, sprocket, sheave, bearing span, or OEM replacement decision.

  4. Review Key and Keyseat Prompts

    Use the local key row, keyway depth, shear, bearing, and length prompts as a checklist for current ASME B17.1 access, OEM drawings, hub length, fits, tolerances, inspection, and qualified mechanical review.

Built For

  • Maintenance teams organizing torque and key engagement questions before an equipment rebuild
  • Mechanical reviewers documenting which shaft, key, hub, OEM, fatigue, and fit records still need follow-up
  • Reliability teams screening whether an uprated drive needs full shaft and coupling review
  • Millwrights preparing measurement and drawing questions for a worn keyway or loose hub
  • Students comparing local shear and bearing arithmetic while keeping standards and safety boundaries visible

Assumptions

  • Torque, bending moment, material, safety factor, and key yield are user-entered local prompts.
  • Local key rows are source-gap review aids, not certified ASME B17.1 table reproductions.
  • Fatigue, stress concentration, hub fit, OEM limits, guarding, and safe-work controls remain outside the app.

References

  • ASME B17.1 Keys and Keyseats source pointer
  • Machinery's Handbook publisher source pointer
  • OSHA 1910.219 mechanical power-transmission apparatus source pointer
  • OSHA 1910.212 machine guarding source pointer

Frequently Asked Questions

No. It displays local key-row prompts and source pointers. Current ASME B17.1 access, drawings, tolerances, hub data, material records, and qualified review control the actual key and keyseat decision.
The local formulas show separate shear and bearing prompts because bearing/crushing can govern a square-key screen. Actual failures also depend on fit, hub length, fretting, shock, key retention, material, and inspection history.
No. The app shows a local torsion or combined-load stress prompt only. Fatigue, notch sensitivity, shoulders, grooves, surface finish, bending, critical speed, and duty cycle need separate engineering review.
Use it only to organize review questions. Replacement keys, damaged keyways, loose hubs, rotating parts, guarding, lockout/tagout, and restart decisions require OEM instructions, measurements, inspection, and qualified maintenance/safety approval.
Disclaimer: This app provides source-aware planning prompts only. It is not a certified ASME B17.1 table, a complete shaft design, a fatigue analysis, an OEM replacement approval, a machine-guarding determination, a repair instruction, or safe-work authorization.

Learn More

Industrial

Shaft and Keyway Sizing: Torque, Stress, and ASME B17.1

Source-boundary guide for local keyway torque prompts, ASME B17.1 rows, material gaps, fatigue, OEM data, fits, and guarding review.

Read Guide →

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