Toggle Clamp Mechanism Simulator
Over-center force amplification, lock-margin design, pin and link stress sizing, and a design recipe for selecting a real clamp from catalog references. Covers four manual geometries plus pneumatic actuation.
Parameters
Geometry (mm)
Forces and material
Material strength
Allowable stress = yield ÷ safety factor. The dashed lines on the stress chart show the bending (σ) and shear (τ) limits.
Manual handle position
Drag the slider to manually move the handle from open through TDC to the locked stop.
Optional. The charts and summary already update live as you change any parameter; this just forces an immediate full recompute.
Analysis Charts
Every curve is swept across the handle's travel from open through top-dead-centre (TDC) to the locked stop. On each chart the red line marks TDC, the amber line the lock position, and the teal line the current handle angle. Drag the handle or any parameter and the charts update live.
Mechanical advantage
Clamping force
Transmission angle
Pin reactions
Stress
Pad output
Download Professional Resources
Generated for your exact clamp parameters: data, design specs, and a complete lab report.
All resources generated for your exact clamp parameters. 1 USD per item, or buy all as a package.
What You Can Adjust and Explore
This free, browser-based toggle clamp simulator lets you change the clamp geometry, forces, and material below and watch the animation and the force-amplification and stress charts update in real time.
Adjustable parameters
- Geometry: handle (15 to 100 mm), grip lever (40 to 300 mm), main link (25 to 200 mm), arm links (15 to 250 mm), base spacing (20 to 200 mm), arm bend angle
- Lock margin past top-dead-center: 0 to 15 degrees
- Forces: handle force (20 to 500 N), pin friction, efficiency
- Sizing: pin diameter (3 to 20 mm), link thickness (2 to 16 mm), link width (10 to 40 mm)
- Material: yield strength (100 to 1000 MPa) and safety factor
One-click presets
Mini benchtop, light-duty, medium-duty, heavy-duty, and industrial load realistic clamp sizes.
What it computes
Mechanical advantage and clamping force over the travel, transmission angle and its quality, pin reactions, link bending and pin shear stress against the allowable, a pass or fail sizing verdict, and pad travel, with downloadable resources.
Frequently asked questions
What can I adjust in this toggle clamp simulator?
The full clamp geometry (handle, main link, arm, grip, and base pivot spacing), the lock margin past top-dead-center, the handle force (20 to 500 N), pin friction and efficiency, the pin diameter and link cross-section for stress sizing, and the material yield strength and safety factor, plus presets from mini benchtop to industrial.
What does the simulator compute?
The mechanical advantage and clamping force through the travel, the transmission angle and its quality, the pin reactions, the link bending and pin shear stresses against the allowable, and a pass or fail sizing verdict.
Why does a toggle clamp self-lock?
Near top-dead-center the pad stops moving while the mechanical advantage grows very large, so a light handle force produces a large clamping force and the clamp holds just past center. The simulator shows this force spike at the lock position.
Is it free, and does it work on mobile?
Yes. It is free and runs in any modern web browser on desktop, tablet, or phone with no installation, with downloadable data and design resources.