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Flat Spring, Cantilever Leaf & Clip Bending Calculator

Calculate spring rate, deflection, and maximum bending stress for flat strip springs, leaf springs, and stamped clips (C75S, 1.4310, CuBe2) with instant Filame RFQ.

Engineering Estimation Notice: Calculations use Euler-Bernoulli beam theory for flat strip springs. Actual performance depends on heat treatment, rolling grain direction, and bend radii. Complex multi-bend clips should be validated via FEA by Filame engineering.
1. Geometry, Strip Alloy & Load Parameters
1. Spring Support Topology
3. Strip Dimensions
0.05 – 20 mm
mm
1 – 500 mm
mm
3 – 1,000 mm
mm
4. Target Input Mode
N
2. Mechanical & Stress Outputs
SAFE — Within elastic limit
Spring Rate (R)
— N/mm —
Calculated Deflection (f) Euler-Bernoulli
Max Bending Stress (σ_max) — MPa Allowable static bending stress: —
Safety Factor & Fatigue Status — × — % σ_adm
Live Bending & Stress Profile
Free State Loaded State
✓ Filame Production Compatibility

Within Filame strip capability (0.15 mm – 6.0 mm). Eligible for laser/CNC prototyping and Bihler / progressive die series.

1-click transfer of dimensions, alloy, and target force/deflection to our engineering office.

Strip & Clip Engineering

Engineering Flat Springs & Elastic Strip Components

Unlike round-wire helical springs (sized on our DIN EN 13906 3D calculator), flat springs, leaf springs, and spring clips operate in pure bending from precision-rolled metal strip (0.15 mm to 6.0 mm).

Maximizing fatigue life requires matching alloy grade (EN 10132-4 hardened carbon strip, EN 10151 cold-rolled 1.4310 stainless), rolling grain direction relative to bends, stress-relief heat treatment, and hydrogen-safe surface finishes.

Questions & Answers

01 How do you calculate the spring rate and deflection of a cantilever flat spring ?
Using Euler-Bernoulli beam theory, a rectangular cantilever spring of thickness h, width b, and active length L has a linear spring rate R = (E · b · h³) / (4 · L³), where E is Young's modulus (206,000 MPa for C75S carbon spring steel, 185,000 MPa for 1.4310 stainless). Doubling the strip thickness increases spring rate by a factor of 8.
02 Which strip alloys does Filame stock for flat springs and stamped clips ?
Filame processes strip thicknesses from 0.15 mm to 6.0 mm in carbon spring steels C75S/C100S, stainless spring steels 1.4310 and 17-7 PH, copper beryllium (CuBe2), phosphor bronze (CuSn6), and Inconel high-temperature superalloys.
03 Why choose a tapered (trapezoidal) flat spring over a rectangular blade ?
A rectangular blade concentrates peak bending stress at the clamped root, whereas a tapered trapezoidal blade distributes bending stress evenly along its length—allowing greater deflection within the same compact envelope for custom flat springs and clips.
04 Can Filame prototype flat springs before committing to progressive stamping dies ?
Yes. We manufacture prototypes via fiber laser cutting and precision forming before scaling to automatic progressive presses and Bihler slide machines. Contact our engineering office for a DFM review.
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Contact us about your precision technical springs

Filame has been a trusted manufacturing partner to industry leaders for decades for precision spring manufacturing and wire forming. Ideally located in Belgium for fast deliveries across Europe, from prototypes to high-volume production. Contact us with or without detailed plans: our engineering and manufacturing teams work with you to produce parts tailored to your specific application.

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+32 67 550 600
Email Us
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Online Tools

Use Filame's online tools to help you design and submit requests for your parts

Free interactive sizing tools, tolerance estimators, and metallurgical selection matrices for mechanical designers and procurement teams.

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DIN EN 13906-1/2

3D Spring Sizing Calculator

Interactive 3D Three.js deflection simulation, dynamic spring rate, stress analysis, Goodman fatigue diagrams, and 1-click RFQ.

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EN 10132 / 10151 Current Tool

Flat & Leaf Spring Calculator

Calculate deflection, spring rate (N/mm), and bending stress for cantilever flat springs, trapezoidal blades, and stamped clips.

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EN 15800:2008

Spring Tolerances Calculator

Standard manufacturing tolerance calculations for test loads (F₁, F₂), diameters, free length, squareness, and parallelism across Grades 1, 2, and 3.

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DIN 6935 / VDI 3389

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DFM Break-Even

Laser vs. Progressive Die Simulator

Find the exact annual volume where progressive stamping or Bihler tooling beats fiber laser cutting + CNC bending.

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Compare 16 European, German (Werkstoffnr.), American (AISI/ASTM), and AFNOR spring alloys with G/E moduli, max temperature, and EN 15800 grades.

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ISO 10303 / AP214 / STL

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Parametric alloy selector for non-magnetic spring applications in medical, aerospace, and precision instrumentation.

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E19 / E42 Motorways

Road Transit & Logistics Calculator

Interactive map to calculate road transit time, driving distance, and overland freight corridors from Filame’s Nivelles factory to your facility.

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