Engineering DisclaimerEngineering calculations are provided for preliminary design and educational/reference purposes only. Users must verify all results according to applicable engineering standards, supplier data, manufacturing requirements, and professional engineering judgment.
AGMA 2001 / DIN 3271
Machine Design
Key shear strength is the maximum torque a keyed shaft connection can transmit without shearing the key. Use the formula T = τ × d × L × w / 2 where τ = allowable shear stress, d = shaft diameter, L = key length, w = key width per AGMA 2001.
Key & Splines Shear Strength Calculator
Calculate shear strength of square/rectangular keys and involute splines per AGMA 2001 and DIN 3271 standards for keyed shaft connections.
Workspace Mode:
Unsaved Configuration
Calculation Results
Key Shear Force
62.500N
Tangential force on the key.
Key Shear Stress
62.500MPa
Actual shear stress in the key.
Safety Factor
62.500
Margin of safety against shear failure.
Key Shear Strength
62.500N·m
Maximum torque the key can transmit.
Calculation Summary
Input Parameters
| Shaft Diameter | 50mm |
| Key Length | 40mm |
| Key Width | 16mm |
| Key Height | 10mm |
| Allowable Shear Stress | 100MPa |
| Applied Torque | 500N·m |
Calculated Results
| Key Shear Force | 62.50N KEY |
| Key Shear Stress | 62.50MPa |
| Safety Factor | 62.50 |
| Key Shear Strength | 62.50N·m |
Safety Notes
This is a dynamic placeholder interface. Calculations will activate in a future release.
Mathematical Models & Equations
Shear Force
F = 2 × T / dKey Shear Stress
τ = 2 × T / (d × L × w)Key Shear Strength
T_max = τ_allow × d × L × w / 2Verification Calculation Log
- 1Retrieve input parameters from form controls.
- 2Substitute first active variable: Input = 50.
- 3Sprint 3 Placeholder: Formula computations will activate in future releases.
Engineering Application Notes
Calculates shear strength of square and rectangular keys used in keyed shaft-hub connections. Based on AGMA 2001 and DIN 3271. Key length should be split between both sides of the keyway for accurate shear area.
Standard Citations & References
- AGMA 2001: Gear Rating by the AIAA Method
- DIN 3271: Keys and keyways
- Shigley's Mechanical Engineering Design, Chapter 8