Tube Bend Calculator
Calculate bend allowance, wall thinning, springback compensation, and mandrel requirements for your tube bending projects.
Input Parameters
Bend Preview
Calculated Results
Inside Diameter (ID)
0.870in
Wall Ratio (OD/Wall)
15.4
Min. Bend Radius (CLR)
1.500in
Bend Allowance (per bend)
3.039in
Total Bend Allowance
3.039in
Est. Wall Thinning
14.3%
Springback Estimate
1.80deg
Mandrel Required
Recommended
Formula Reference
ID = OD - 2 × Wall
Wall Ratio = OD / Wall
CLR = OD × Min Radius Multiplier
BA = (π/180) × θ × (CLR + OD/2 - Wall)
Thinning = OD / (4×CLR + OD) × 100%
Springback = θ × 0.02 × Factor
This calculator provides engineering estimates for reference purposes. Actual results may vary based on tooling condition, machine setup, material lot variations, and other process variables. Contact Harco engineering for production-grade bend specifications.
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