Bolt Fatigue Life Calculator

Le Bolt Fatigue Life Calculator is an advanced engineering tool designed to estimate the service life of bolts under repeated and cyclic loading conditions. By analyzing key factors such as bolt dimensions, material fatigue strength, preload force, stress range, and load cycles, it helps engineers evaluate fatigue performance and identify potential failure risks. The Bolt Fatigue Life Calculator supports fastener design, structural reliability analysis, and preventive maintenance planning while helping reduce unexpected bolt failures and improve the durability of mechanical connections.

Bolt Fatigue Life Calculator | Bolt Stress Life & Fatigue Safety Factor

Input parameters

1 Bolt geometry

Bolt diameter ?Nominal major diameter d. Used with thread pitch to calculate tensile stress area A_t for stress σ = F / A_t.

Thread pitch ?Metric: mm between threads (M12 coarse = 1.75 mm). Imperial: threads per inch (TPI).

Tensile stress area A_t ?Effective tensile area of the threaded section. Auto-calculated or enter a catalog value manually.

mm²

Enter A_t manually

UN_t = π/4 × (d − 0.9382 p)² for metric threads. ISO 898-1 M12 coarse = 84.3 mm².

2 Cyclic loading

Maximum applied load ?Peak external cyclic load on the bolt (added to preload for total stress). Must be ≥ minimum load.

Minimum applied load ?Minimum external cyclic load. Use 0 if load drops to zero while preload maintains clamp force.

—

Preload force ?Initial bolt tension from tightening. Contributes to mean stress: σ = (F_preload + F_external) / A_t.

—

Loading type ?Tensile: axial bolt load. Shear: applies 0.577 von Mises factor. Combined: simplified equivalent-stress factor.

3 Material & fatigue properties

Bolt material grade ?ISO 898-1 property classes with typical fatigue strength at 10⁶ cycles. Choose Custom Material to enter catalog values.

Ultimate tensile strength S_ut

MPa

Fatigue strength S_e ?Endurance limit or fatigue strength at ~10⁶ cycles for the bolt material and surface condition reference.

MPa

4 Advanced fatigue parameters

Surface condition ?Modifies effective fatigue strength. Threaded and corroded surfaces reduce endurance limit. Stress concentration K_t ?Thread root stress concentration. Typical range 1.5–3.0 for rolled threads; higher for cut threads. Mean stress correction ?Goodman: σa/Se + σm/Sut = 1. Gerber: parabolic mean-stress effect. Soderberg: uses yield strength.

Target number of cycles (optional) ?Optional fatigue verification. Computes safety factor at the specified service life using the S-N curve.

S-N curve: σ_un = A × N^b. Alternating stress σ_un = (σ_max − σ_min) / 2. Fatigue safety factor = allowable fatigue stress / actual alternating stress.

Calculation results

Alternating stress σ_un

—

σ_un = (σ_max − σ_min) / 2

Estimated fatigue life

—

S-N curve estimate

Fatigue safety factor

—

Se / σ_un (corrected)

Corrected allowable σ_un

—

Mean-stress corrected endurance

Bolt fatigue stress diagram

S-N curve chart

S-N curve Operating point Corrected Se

Fatigue safety factor gauge

—

Scale 0–3

Stress utilization (σ_un vs allowable) —

Fatigue life indicator — —

10³ cycles10⁶10⁸

(function () {
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  var root = document.getElementById("bfl-root");
  if (!root || root.getAttribute("data-bfl-ready") === "1") return;
  root.setAttribute("data-bfl-ready", "1");

  var ARC_LEN = 282.743;
  var MM_PER_IN = 25.4;
  var MM2_PER_IN2 = 645.16;
  var PSI_PER_MPA = 145.03773773;
  var LBF_PER_N = 0.224808943;
  var N_REF_LOW = 1e3;
  var N_REF_HIGH = 1e6;

  var SIZES_M = [
    { label: "M6", d: 6, p: 1 },
    { label: "M8", d: 8, p: 1.25 },
    { label: "M10", d: 10, p: 1.5 },
    { label: "M12", d: 12, p: 1.75 },
    { label: "M16", d: 16, p: 2 },
    { label: "M20", d: 20, p: 2.5 },
    { label: "M24", d: 24, p: 3 }
  ];
  var SIZES_IN = [
    { label: "1/4-20", d: 0.25, tpi: 20 },
    { label: "5/16-18", d: 0.3125, tpi: 18 },
    { label: "3/8-16", d: 0.375, tpi: 16 },
    { label: "1/2-13", d: 0.5, tpi: 13 },
    { label: "5/8-11", d: 0.625, tpi: 11 },
    { label: "3/4-10", d: 0.75, tpi: 10 }
  ];

  var GRADES = {
    "8.8":  { sut: 800, sy: 640, se: 200, label: "Grade 8.8" },
    "10.9": { sut: 1000, sy: 900, se: 250, label: "Grade 10.9" },
    "12.9": { sut: 1200, sy: 1080, se: 280, label: "Grade 12.9" },
    ss:     { sut: 700, sy: 450, se: 180, label: "Stainless Steel A2-70" },
    custom: null
  };

  var SURFACE = {
    polished: { factor: 1.0, label: "Polished" },
    machined: { factor: 0.92, label: "Machined" },
    threaded: { factor: 0.78, label: "Threaded" },
    corroded: { factor: 0.55, label: "Corroded" }
  };

  var DEFAULTS = {
    unit: "metric",
    d: 12,
    p: 1.75,
    atManual: false,
    grade: "10.9",
    sut: 1000,
    se: 250,
    Fmax: 30000,
    Fmin: 5000,
    Fpreload: 20000,
    fUnit: "N",
    loadType: "tensile",
    surface: "threaded",
    kt: 2.5,
    meanMethod: "goodman",
    targetCycles: "",
    size: "M12"
  };

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    d: byId("bflD"),
    p: byId("bflP"),
    at: byId("bflAt"),
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    grade: byId("bflGrade"),
    sut: byId("bflSut"),
    se: byId("bflSe"),
    Fmax: byId("bflFmax"),
    Fmin: byId("bflFmin"),
    Fpreload: byId("bflFpreload"),
    fUnit: byId("bflFUnit"),
    loadType: byId("bflLoadType"),
    surface: byId("bflSurface"),
    kt: byId("bflKt"),
    meanMethod: byId("bflMeanMethod"),
    targetCycles: byId("bflTargetCycles"),
    btnMetric: byId("bflBtnMetric"),
    btnImperial: byId("bflBtnImperial"),
    btnReset: byId("bflBtnReset"),
    btnCalc: byId("bflBtnCalculate"),
    results: byId("bflResults"),
    sizeChips: byId("bflSizeChips"),
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    outLife: byId("bflOutLife"),
    outLifeSub: byId("bflOutLifeSub"),
    outSf: byId("bflOutSf"),
    outSfSub: byId("bflOutSfSub"),
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    outDelta: byId("bflOutDelta"),
    outSigmaMax: byId("bflOutSigmaMax"),
    outSigmaMin: byId("bflOutSigmaMin"),
    outSeEff: byId("bflOutSeEff"),
    outUtil: byId("bflOutUtil"),
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    needle: byId("bflNeedle"),
    gaugeRead: byId("bflGaugeRead"),
    gaugeNote: byId("bflGaugeNote"),
    schematic: byId("bflSchematic"),
    schMax: byId("bflSchMax"),
    schMin: byId("bflSchMin"),
    snCurve: byId("bflSnCurve"),
    snPoint: byId("bflSnPoint"),
    snTarget: byId("bflSnTarget"),
    snEndurance: byId("bflSnEndurance"),
    snAxisLabel: byId("bflSnAxisLabel"),
    lifeBar: byId("bflLifeBar"),
    lifeBarFill: byId("bflLifeBarFill"),
    lifeBarLabel: byId("bflLifeBarLabel"),
    alerts: byId("bflAlerts"),
    tiles: byId("bflTiles")
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  function fmtCycles(N) {
    if (!isFinite(N) || N <= 0) return "-";
    if (N >= 1e9) return fmt(N / 1e9, 2) + " billion";
    if (N >= 1e6) return fmt(N / 1e6, 2) + " million";
    if (N >= 1e3) return fmt(N / 1e3, 1) + " thousand";
    return fmt(N, 0);
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  function setErr(key, msg) {
    var node = byId("bflErr" + key);
    var map = {
      D: el.d, P: el.p, At: el.at, Sut: el.sut, Se: el.se,
      Fmax: el.Fmax, Fmin: el.Fmin, Fpreload: el.Fpreload, Kt: el.kt, Target: el.targetCycles
    };
    var input = map[key];
    if (node) node.textContent = msg || "";
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      if (msg) input.classList.add("bfl-invalid");
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  function clearErrs() {
    ["D", "P", "At", "Sut", "Se", "Fmax", "Fmin", "Fpreload", "Kt", "Target"].forEach(function (k) {
      setErr(k, "");
    });
  }

  function updateUnitLabels() {
    var metric = state.unit === "metric";
    root.querySelectorAll("[data-unit='d']").forEach(function (n) { n.textContent = metric ? "mm" : "in"; });
    root.querySelectorAll("[data-unit='p']").forEach(function (n) { n.textContent = metric ? "mm" : "TPI"; });
    root.querySelectorAll("[data-unit='at']").forEach(function (n) { n.textContent = metric ? "mm\u00b2" : "in\u00b2"; });
    root.querySelectorAll("[data-unit='s']").forEach(function (n) { n.textContent = metric ? "MPa" : "psi"; });
    if (el.btnMetric) el.btnMetric.classList.toggle("bfl-is-active", metric);
    if (el.btnImperial) el.btnImperial.classList.toggle("bfl-is-active", !metric);
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  function renderSizeChips() {
    if (!el.sizeChips) return;
    var list = state.unit === "metric" ? SIZES_M : SIZES_IN;
    el.sizeChips.innerHTML = "";
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      btn.addEventListener("click", function () {
        state.sizeId = s.label;
        el.d.value = String(s.d);
        el.p.value = String(state.unit === "metric" ? s.p : s.tpi);
        if (!el.atManual.checked) refreshAt();
        paintChips();
        if (state.live) calculate(false);
      });
      el.sizeChips.appendChild(btn);
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    if (!el.sizeChips) return;
    el.sizeChips.querySelectorAll(".bfl-chip").forEach(function (btn) {
      btn.classList.toggle("bfl-is-active", btn.textContent === state.sizeId);
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  }

  function tensileArea(dDisp, pDisp, unit) {
    if (!(dDisp > 0) || !(pDisp > 0)) return NaN;
    var core = unit === "metric" ? dDisp - 0.9382 * pDisp : dDisp - 0.9743 / pDisp;
    if (!(core > 0)) return NaN;
    return Math.PI / 4 * core * core;
  }

  function refreshAt() {
    if (el.atManual.checked) return;
    var at = tensileArea(num(el.d), num(el.p), state.unit);
    if (isFinite(at)) el.at.value = at >= 10 ? at.toFixed(1) : at.toFixed(4);
  }

  function applyGrade() {
    var g = GRADES[el.grade.value];
    if (!g) {
      el.sut.readOnly = false;
      el.se.readOnly = false;
      return;
    }
    state.applying = true;
    var metric = state.unit === "metric";
    el.sut.value = metric ? String(g.sut) : roundSmart(g.sut * PSI_PER_MPA);
    el.se.value = metric ? String(g.se) : roundSmart(g.se * PSI_PER_MPA);
    el.sut.readOnly = true;
    el.se.readOnly = true;
    state.applying = false;
  }

  function markCustomGrade() {
    if (state.applying) return;
    if (el.grade.value !== "custom") el.grade.value = "custom";
    el.sut.readOnly = false;
    el.se.readOnly = false;
  }

  function forceToN(node) {
    var v = num(node);
    if (!isFinite(v)) return NaN;
    var u = el.fUnit.value;
    if (u === "kN") return v * 1000;
    if (u === "lbf") return v / LBF_PER_N;
    return v;
  }

  function convertForceUnitValue(value, fromU, toU) {
    if (!isFinite(value)) return value;
    var n = value;
    if (fromU === "kN") n *= 1000;
    if (fromU === "lbf") n /= LBF_PER_N;
    if (toU === "kN") return n / 1000;
    if (toU === "lbf") return n * LBF_PER_N;
    return n;
  }

  function formatForce(N) {
    if (!isFinite(N)) return { primary: "-", secondary: "" };
    if (state.unit === "imperial") {
      return { primary: fmt(N * LBF_PER_N, 1) + " lbf", secondary: fmt(N / 1000, 2) + " kN" };
    }
    if (Math.abs(N) >= 1000) {
      return { primary: fmt(N / 1000, 2) + " kN", secondary: fmt(N, 0) + " N" };
    }
    return { primary: fmt(N, 1) + " N", secondary: fmt(N * LBF_PER_N, 1) + " lbf" };
  }

  function formatStress(MPa) {
    if (!isFinite(MPa)) return { primary: "-", secondary: "" };
    if (state.unit === "imperial") {
      return { primary: fmt(MPa * PSI_PER_MPA, 0) + " psi", secondary: fmt(MPa, 1) + " MPa" };
    }
    return { primary: fmt(MPa, 1) + " MPa", secondary: fmt(MPa * PSI_PER_MPA, 0) + " psi" };
  }

  function formatArea(mm2) {
    if (!isFinite(mm2)) return "-";
    if (state.unit === "imperial") return fmt(mm2 / MM2_PER_IN2, 4) + " in\u00b2";
    return fmt(mm2, 1) + " mm\u00b2";
  }

  function switchUnit(next) {
    if (next === state.unit) return;
    var d = num(el.d);
    var p = num(el.p);
    var at = num(el.at);
    var sut = num(el.sut);
    var se = num(el.se);
    var fromFU = el.fUnit.value;
    var toFU = next === "imperial" ? "lbf" : "N";

    if (next === "imperial") {
      if (isFinite(d)) el.d.value = roundSmart(d / MM_PER_IN);
      if (isFinite(p) && p > 0) el.p.value = roundSmart(MM_PER_IN / p);
      if (isFinite(at)) el.at.value = roundSmart(at / MM2_PER_IN2);
      if (isFinite(sut)) el.sut.value = roundSmart(sut * PSI_PER_MPA);
      if (isFinite(se)) el.se.value = roundSmart(se * PSI_PER_MPA);
    } else {
      if (isFinite(d)) el.d.value = roundSmart(d * MM_PER_IN);
      if (isFinite(p) && p > 0) el.p.value = roundSmart(MM_PER_IN / p);
      if (isFinite(at)) el.at.value = roundSmart(at * MM2_PER_IN2);
      if (isFinite(sut)) el.sut.value = roundSmart(sut / PSI_PER_MPA);
      if (isFinite(se)) el.se.value = roundSmart(se / PSI_PER_MPA);
    }

    ["Fmax", "Fmin", "Fpreload"].forEach(function (key) {
      var node = el[key];
      var F = num(node);
      if (isFinite(F)) node.value = roundSmart(convertForceUnitValue(F, fromFU, toFU));
    });

    el.fUnit.value = toFU;
    lastFUnit = toFU;
    state.sizeId = "";
    state.unit = next;
    updateUnitLabels();
    renderSizeChips();
    if (!el.atManual.checked) refreshAt();
    if (state.live) calculate(false);
  }

  function toSI() {
    var metric = state.unit === "metric";
    var d = num(el.d);
    var p = num(el.p);
    var at = num(el.at);
    var sut = num(el.sut);
    var se = num(el.se);
    return {
      d: d, p: p, at: at, sut: sut, se: se,
      d_mm: metric ? d : d * MM_PER_IN,
      p_mm: metric ? p : (p > 0 ? MM_PER_IN / p : NaN),
      at_mm2: metric ? at : at * MM2_PER_IN2,
      sut_MPa: metric ? sut : sut / PSI_PER_MPA,
      se_MPa: metric ? se : se / PSI_PER_MPA,
      Fmax_N: forceToN(el.Fmax),
      Fmin_N: forceToN(el.Fmin),
      Fpreload_N: forceToN(el.Fpreload),
      kt: num(el.kt),
      targetCycles: num(el.targetCycles),
      loadType: el.loadType.value,
      surface: el.surface.value,
      meanMethod: el.meanMethod.value
    };
  }

  function empty(node) {
    return !node || String(node.value).trim() === "";
  }

  function snConstants(sut, se) {
    var sigma1 = 0.9 * sut;
    var sigma2 = se;
    if (!(sigma1 > 0) || !(sigma2 > 0) || sigma2 >= sigma1) {
      sigma1 = Math.max(se * 2.5, se + 50);
    }
    var b = Math.log(sigma2 / sigma1) / Math.log(N_REF_HIGH / N_REF_LOW);
    var A = sigma1 / Math.pow(N_REF_LOW, b);
    return { A: A, b: b, sigma1: sigma1, sigma2: sigma2 };
  }

  function stressAtCycles(A, b, N) {
    return A * Math.pow(N, b);
  }

  function cyclesAtStress(A, b, sigmaA) {
    if (!(sigmaA > 0) || !(A > 0)) return NaN;
    return Math.pow(sigmaA / A, 1 / b);
  }

  function meanCorrectedAllowable(se, sigmaM, sut, sy, method) {
    if (!(se > 0)) return NaN;
    if (sigmaM <= 0) return se;
    if (method === "gerber") {
      var ratio = sigmaM / sut;
      return se * (1 - ratio * ratio);
    }
    if (method === "soderberg") {
      return se * (1 - sigmaM / sy);
    }
    return se * (1 - sigmaM / sut);
  }

  function loadFactor(loadType) {
    if (loadType === "shear") return 0.577;
    if (loadType === "combined") return 0.85;
    return 1.0;
  }

  function validate(si) {
    var ok = true;
    clearErrs();

    if (empty(el.d) || !isFinite(num(el.d))) { setErr("D", "Enter a bolt diameter."); ok = false; }
    else if (!(si.d > 0)) { setErr("D", "Diameter must be greater than zero."); ok = false; }

    if (empty(el.p) || !isFinite(num(el.p))) {
      setErr("P", state.unit === "metric" ? "Enter thread pitch." : "Enter threads per inch (TPI).");
      ok = false;
    } else if (!(si.p > 0)) { setErr("P", "Pitch must be greater than zero."); ok = false; }

    if (empty(el.at) || !isFinite(num(el.at))) {
      setErr("At", "Enter tensile stress area, or uncheck manual input to auto-calculate.");
      ok = false;
    } else if (!(si.at > 0)) { setErr("At", "Tensile stress area must be greater than zero."); ok = false; }

    if (empty(el.Fmax) || !isFinite(num(el.Fmax))) { setErr("Fmax", "Enter maximum applied load."); ok = false; }
    else if (si.Fmax_N < 0) { setErr("Fmax", "Maximum load cannot be negative."); ok = false; }

    if (empty(el.Fmin) || !isFinite(num(el.Fmin))) { setErr("Fmin", "Enter minimum applied load."); ok = false; }
    else if (si.Fmin_N < 0) { setErr("Fmin", "Minimum load cannot be negative."); ok = false; }

    if (si.Fmax_N < si.Fmin_N) {
      setErr("Fmax", "Maximum load must be greater than or equal to minimum load.");
      ok = false;
    }

    if (empty(el.Fpreload) || !isFinite(num(el.Fpreload))) { setErr("Fpreload", "Enter bolt preload force."); ok = false; }
    else if (si.Fpreload_N < 0) { setErr("Fpreload", "Preload cannot be negative."); ok = false; }

    if (empty(el.sut) || !isFinite(num(el.sut))) { setErr("Sut", "Enter ultimate tensile strength."); ok = false; }
    else if (!(si.sut > 0)) { setErr("Sut", "Ultimate tensile strength must be greater than zero."); ok = false; }

    if (empty(el.se) || !isFinite(num(el.se))) { setErr("Se", "Enter fatigue strength (endurance limit)."); ok = false; }
    else if (!(si.se > 0)) { setErr("Se", "Fatigue strength must be greater than zero."); ok = false; }
    else if (si.se_MPa >= si.sut_MPa) {
      setErr("Se", "Fatigue strength should be less than ultimate tensile strength.");
      ok = false;
    }

    if (empty(el.kt) || !isFinite(num(el.kt))) { setErr("Kt", "Enter stress concentration factor."); ok = false; }
    else if (!(si.kt >= 1) || si.kt > 5) { setErr("Kt", "Kt is typically between 1.0 and 3.0 for bolt threads."); ok = false; }

    if (!empty(el.targetCycles)) {
      if (!isFinite(si.targetCycles) || si.targetCycles <= 0) {
        setErr("Target", "Target cycles must be a positive number.");
        ok = false;
      }
    }

    return ok;
  }

  function setGauge(sf) {
    var frac = clamp((isFinite(sf) ? sf : 0) / 3, 0, 1);
    if (el.gaugeArc) el.gaugeArc.setAttribute("stroke-dashoffset", String(ARC_LEN * (1 - frac)));
    var ang = -90 + frac * 180;
    if (el.needle) el.needle.setAttribute("transform", "rotate(" + ang + " 120 118)");
  }

  function setSchematic(status, sigmaMax, sigmaMin, se) {
    if (!el.schematic) return;
    el.schematic.setAttribute("data-status", status || "idle");
    var scale = Math.max(sigmaMax, sigmaMin, se, 1);
    var yMax = 48 + (1 - sigmaMax / scale) * 72;
    var yMin = 48 + (1 - sigmaMin / scale) * 72;
    var ySe = 48 + (1 - se / scale) * 72;
    if (el.schMax) {
      el.schMax.setAttribute("y1", String(yMax));
      el.schMax.setAttribute("y2", String(yMax));
    }
    if (el.schMin) {
      el.schMin.setAttribute("y1", String(yMin));
      el.schMin.setAttribute("y2", String(yMin));
    }
    var wave = el.schematic.querySelector("#bflStressWave");
    if (wave) {
      wave.setAttribute("d", "M 24 " + yMax + " Q 54 " + ((yMax + yMin) / 2) + " 84 " + yMin +
        " Q 114 " + ((yMax + yMin) / 2) + " 144 " + yMax + " Q 174 " + ((yMax + yMin) / 2) + " 204 " + yMin);
    }
    var seLine = el.schematic.querySelector("#bflSeLine");
    if (seLine) seLine.setAttribute("y1", String(ySe)), seLine.setAttribute("y2", String(ySe));
  }

  function drawSnChart(sn, sigmaA, lifeN, seEff, targetN) {
    if (!el.snCurve) return;
    var W = 320;
    var H = 160;
    var padL = 42;
    var padR = 12;
    var padT = 12;
    var padB = 28;
    var plotW = W - padL - padR;
    var plotH = H - padT - padB;

    var nMin = 1e3;
    var nMax = 1e8;
    var sigmaMax = Math.max(sn.sigma1, sigmaA * 1.2, seEff * 1.5, 50);
    var logN = function (n) { return Math.log10(n); };
    var xOf = function (n) { return padL + (logN(n) - logN(nMin)) / (logN(nMax) - logN(nMin)) * plotW; };
    var yOf = function (s) { return padT + (1 - s / sigmaMax) * plotH; };

    var pts = [];
    for (var i = 0; i <= 40; i++) {
      var n = Math.pow(10, logN(nMin) + (logN(nMax) - logN(nMin)) * i / 40);
      var sa = stressAtCycles(sn.A, sn.b, n);
      pts.push(xOf(n).toFixed(1) + "," + yOf(sa).toFixed(1));
    }
    el.snCurve.setAttribute("points", pts.join(" "));

    if (el.snPoint && isFinite(lifeN) && lifeN >= nMin) {
      var px = xOf(clamp(lifeN, nMin, nMax));
      var py = yOf(sigmaA);
      el.snPoint.setAttribute("cx", String(px));
      el.snPoint.setAttribute("cy", String(py));
      el.snPoint.style.display = "";
    } else if (el.snPoint) {
      el.snPoint.style.display = "none";
    }

    if (el.snEndurance) {
      var ey = yOf(seEff);
      el.snEndurance.setAttribute("y1", String(ey));
      el.snEndurance.setAttribute("y2", String(ey));
    }

    if (el.snTarget && isFinite(targetN) && targetN >= nMin) {
      var tx = xOf(clamp(targetN, nMin, nMax));
      el.snTarget.setAttribute("x1", String(tx));
      el.snTarget.setAttribute("x2", String(tx));
      el.snTarget.style.display = "";
    } else if (el.snTarget) {
      el.snTarget.style.display = "none";
    }
  }

  function riskFromSf(sf) {
    if (!isFinite(sf)) return { status: "caution", title: "Check inputs", level: "Medium Risk" };
    if (sf >= 1.5) return { status: "safe", title: "Low Risk", level: "Low Risk" };
    if (sf >= 1.0) return { status: "caution", title: "Medium Risk", level: "Medium Risk" };
    return { status: "risk", title: "High Risk", level: "High Risk" };
  }

  function calculate(scroll) {
    refreshAt();
    var si = toSI();
    var ok = validate(si);
    if (el.results) el.results.classList.remove("bfl-hidden");

    if (!ok) {
      state.live = false;
      if (el.statusTitle) el.statusTitle.textContent = "Check inputs";
      if (el.statusNote) el.statusNote.textContent = "Correct the highlighted fields, then calculate again.";
      if (el.banner) el.banner.className = "bfl-banner bfl-banner-caution";
      setGauge(0);
      setSchematic("idle");
      if (scroll) {
        try { el.results.scrollIntoView({ behavior: "smooth", block: "nearest" }); } catch (e) {}
      }
      return;
    }

    var At = si.at_mm2;
    var lf = loadFactor(si.loadType);
    var surf = SURFACE[si.surface] || SURFACE.threaded;
    var sy = si.sut_MPa * (GRADES[el.grade.value] ? GRADES[el.grade.value].sy / GRADES[el.grade.value].sut : 0.9);

    var sigmaMax = (si.Fpreload_N + si.kt * si.Fmax_N * lf) / At;
    var sigmaMin = (si.Fpreload_N + si.kt * si.Fmin_N * lf) / At;
    var Fmax = si.Fpreload_N + si.Fmax_N;
    var Fmin = si.Fpreload_N + si.Fmin_N;
    var sigmaA = (sigmaMax - sigmaMin) / 2;
    var sigmaM = (sigmaMax + sigmaMin) / 2;
    var deltaSigma = sigmaMax - sigmaMin;

    var seBase = si.se_MPa * surf.factor;
    var seEff = meanCorrectedAllowable(seBase, sigmaM, si.sut_MPa, sy, si.meanMethod);
    if (!(seEff > 0)) seEff = 1;

    var sn = snConstants(si.sut_MPa, seBase);
    var lifeN = cyclesAtStress(sn.A, sn.b, sigmaA);
    var sfFatigue = seEff / sigmaA;

    var targetN = empty(el.targetCycles) ? NaN : si.targetCycles;
    var sfTarget = NaN;
    if (isFinite(targetN) && targetN > 0) {
      var allowAtTarget = stressAtCycles(sn.A, sn.b, targetN);
      allowAtTarget = meanCorrectedAllowable(allowAtTarget, sigmaM, si.sut_MPa, sy, si.meanMethod);
      sfTarget = allowAtTarget / sigmaA;
    }

    var risk = riskFromSf(isFinite(targetN) ? sfTarget : sfFatigue);
    var util = (sigmaA / seEff) * 100;

    var alerts = [];
    if (sigmaA >= seBase) {
      alerts.push({ type: "risk", text: "Alternating stress exceeds the base fatigue strength. Failure may occur at or before the endurance region." });
    } else if (sigmaA >= 0.85 * seBase) {
      alerts.push({ type: "warn", text: "Alternating stress is above 85% of fatigue strength. Monitor this joint under service loads." });
    }
    if (isFinite(lifeN) && lifeN < 1e4) {
      alerts.push({ type: "risk", text: "Estimated fatigue life is extremely low (" + fmtCycles(lifeN) + " cycles). Redesign or reduce cyclic load." });
    } else if (isFinite(lifeN) && lifeN < 1e5) {
      alerts.push({ type: "warn", text: "Estimated fatigue life is below 100,000 cycles. Verify loading and material data." });
    }
    if (sigmaM > 0.6 * si.sut_MPa) {
      alerts.push({ type: "warn", text: "High mean stress (" + fmt(sigmaM / si.sut_MPa * 100, 0) + "% of Sut) reduces effective fatigue capacity. Mean-stress correction applied." });
    }
    if (si.Fmin_N === 0 && si.Fpreload_N > 0) {
      alerts.push({ type: "ok", text: "Preload maintains joint compression; minimum external load is zero in this cycle." });
    }
    if (si.loadType === "shear") {
      alerts.push({ type: "ok", text: "Shear loading uses 0.577 tensile-equivalent factor (von Mises). Confirm thread shear area if critical." });
    }
    if (si.loadType === "combined") {
      alerts.push({ type: "warn", text: "Combined loading uses a simplified equivalent-stress factor. Detailed analysis may be required." });
    }

    var note = "";
    if (risk.status === "safe") {
      note = "Fatigue safety factor is acceptable for the selected mean-stress method. Estimated life is " + fmtCycles(lifeN) + " cycles.";
      alerts.unshift({ type: "ok", text: "Bolt Fatigue Analysis Tool result: " + risk.level + ". SF = " + fmt(sfFatigue, 2) + "." });
    } else if (risk.status === "caution") {
      note = "Stress level requires monitoring. Consider larger diameter, higher grade, improved surface finish, or reduced load variation.";
      alerts.unshift({ type: "warn", text: "Fatigue margin is limited. SF = " + fmt(isFinite(targetN) ? sfTarget : sfFatigue, 2) + "." });
    } else {
      note = "Fatigue failure may occur before expected service life. Reduce alternating stress or increase fastener capacity.";
      alerts.unshift({ type: "risk", text: "High fatigue risk — alternating stress exceeds corrected allowable fatigue stress." });
    }

    var sAFmt = formatStress(sigmaA);
    if (el.outSigmaA) el.outSigmaA.textContent = sAFmt.primary;
    if (el.outSigmaASub) el.outSigmaASub.textContent = "\u03c3a = (\u03c3max \u2212 \u03c3min) / 2";
    if (el.outLife) el.outLife.textContent = fmtCycles(lifeN);
    if (el.outLifeSub) el.outLifeSub.textContent = isFinite(lifeN) ? "S-N curve estimate" : "—";
    if (el.outSf) el.outSf.textContent = fmt(isFinite(targetN) ? sfTarget : sfFatigue, 2);
    if (el.outSfSub) el.outSfSub.textContent = isFinite(targetN) ? "At " + fmtCycles(targetN) + " target cycles" : "Se / \u03c3a (corrected)";
    if (el.outSigmaM) el.outSigmaM.textContent = formatStress(sigmaM).primary;
    if (el.outDelta) el.outDelta.textContent = formatStress(deltaSigma).primary;
    if (el.outSigmaMax) el.outSigmaMax.textContent = formatStress(sigmaMax).primary;
    if (el.outSigmaMin) el.outSigmaMin.textContent = formatStress(sigmaMin).primary;
    if (el.outSeEff) el.outSeEff.textContent = formatStress(seEff).primary;
    if (el.outUtil) el.outUtil.textContent = fmt(util, 1) + "% of allowable \u03c3a";
    if (el.utilFill) {
      el.utilFill.style.width = clamp(util, 0, 100) + "%";
      el.utilFill.className = "bfl-util-fill" + (risk.status === "risk" ? " bfl-is-risk" : risk.status === "caution" ? " bfl-is-caution" : " bfl-is-ok");
    }

    if (el.gaugeRead) el.gaugeRead.textContent = fmt(isFinite(targetN) ? sfTarget : sfFatigue, 2);
    if (el.gaugeNote) el.gaugeNote.textContent = "Fatigue SF (scale 0–3)";
    setGauge(isFinite(targetN) ? sfTarget : sfFatigue);

    setSchematic(risk.status === "risk" ? "risk" : risk.status === "caution" ? "caution" : "ok", sigmaMax, sigmaMin, seEff);
    drawSnChart(sn, sigmaA, lifeN, seEff, targetN);

    if (el.lifeBarFill && isFinite(lifeN)) {
      var logLife = Math.log10(clamp(lifeN, 1e3, 1e8));
      var pct = ((logLife - 3) / 5) * 100;
      el.lifeBarFill.style.width = clamp(pct, 2, 100) + "%";
      el.lifeBarFill.className = "bfl-life-fill" + (risk.status === "risk" ? " bfl-is-risk" : risk.status === "caution" ? " bfl-is-caution" : " bfl-is-ok");
      if (el.lifeBarLabel) el.lifeBarLabel.textContent = fmtCycles(lifeN) + " cycles";
    }

    if (el.tiles) {
      el.tiles.innerHTML =
        tile("Stress range \u0394\u03c3", formatStress(deltaSigma).primary, "\u0394\u03c3 = \u03c3max \u2212 \u03c3min") +
        tile("Mean stress \u03c3m", formatStress(sigmaM).primary, "Includes preload") +
        tile("Max stress \u03c3max", formatStress(sigmaMax).primary, "Kt on external load") +
        tile("Min stress \u03c3min", formatStress(sigmaMin).primary, formatForce(Fmin).primary + " nominal total") +
        tile("Corrected Se", formatStress(seEff).primary, si.meanMethod.charAt(0).toUpperCase() + si.meanMethod.slice(1) + " correction") +
        tile("Tensile area At", formatArea(At), el.atManual.checked ? "manual" : "from d, pitch") +
        tile("S-N exponent b", fmt(sn.b, 4), "Material curve fit") +
        tile("Load type", si.loadType.charAt(0).toUpperCase() + si.loadType.slice(1), "Kt = " + fmt(si.kt, 2)) +
        tile("Surface factor", fmt(surf.factor, 2), surf.label);
    }

    if (el.statusTitle) el.statusTitle.textContent = risk.title;
    if (el.statusNote) el.statusNote.textContent = note;
    if (el.banner) el.banner.className = "bfl-banner bfl-banner-" + (risk.status === "safe" ? "ok" : risk.status === "risk" ? "risk" : "caution");

    if (el.alerts) {
      el.alerts.innerHTML = "";
      alerts.forEach(function (a) {
        var div = document.createElement("div");
        div.className = "bfl-alert bfl-alert-" + (a.type === "risk" ? "risk" : a.type === "ok" ? "ok" : "warn");
        div.textContent = a.text;
        el.alerts.appendChild(div);
      });
    }

    state.live = true;
    if (scroll) {
      try { el.banner.closest(".bfl-card").scrollIntoView({ behavior: "smooth", block: "nearest" }); } catch (e) {}
    }
  }

  function tile(k, v, u) {
    return '<div class="bfl-tile"><div class="bfl-k">' + k + '</div><div class="bfl-v">' + v + '</div><div class="bfl-u">' + u + '</div></div>';
  }

  function resetAll() {
    state.unit = "metric";
    state.sizeId = DEFAULTS.size;
    state.live = false;
    el.d.value = String(DEFAULTS.d);
    el.p.value = String(DEFAULTS.p);
    el.atManual.checked = false;
    el.at.readOnly = true;
    el.grade.value = DEFAULTS.grade;
    el.Fmax.value = String(DEFAULTS.Fmax);
    el.Fmin.value = String(DEFAULTS.Fmin);
    el.Fpreload.value = String(DEFAULTS.Fpreload);
    el.fUnit.value = DEFAULTS.fUnit;
    lastFUnit = DEFAULTS.fUnit;
    el.loadType.value = DEFAULTS.loadType;
    el.surface.value = DEFAULTS.surface;
    el.kt.value = String(DEFAULTS.kt);
    el.meanMethod.value = DEFAULTS.meanMethod;
    el.targetCycles.value = DEFAULTS.targetCycles;
    applyGrade();
    updateUnitLabels();
    renderSizeChips();
    refreshAt();
    clearErrs();
    el.results.classList.add("bfl-hidden");
    setGauge(0);
    setSchematic("idle");
  }

  function onRootClick(e) {
    var btn = e.target && e.target.closest ? e.target.closest("button") : null;
    if (!btn || !root.contains(btn)) return;
    if (btn.id === "bflBtnMetric") { e.preventDefault(); switchUnit("metric"); }
    else if (btn.id === "bflBtnImperial") { e.preventDefault(); switchUnit("imperial"); }
    else if (btn.id === "bflBtnReset") { e.preventDefault(); resetAll(); }
    else if (btn.id === "bflBtnCalculate") { e.preventDefault(); calculate(true); }
  }

  root.addEventListener("click", onRootClick);
  if (el.btnCalc) el.btnCalc.addEventListener("click", function () { calculate(true); });

  el.atManual.addEventListener("change", function () {
    el.at.readOnly = !el.atManual.checked;
    if (!el.atManual.checked) refreshAt();
    if (state.live) calculate(false);
  });

  el.grade.addEventListener("change", function () {
    if (el.grade.value === "custom") {
      el.sut.readOnly = false;
      el.se.readOnly = false;
    } else applyGrade();
    if (state.live) calculate(false);
  });

  ["sut", "se"].forEach(function (key) {
    el[key].addEventListener("input", function () {
      markCustomGrade();
      if (state.live) calculate(false);
    });
  });

  ["d", "p"].forEach(function (key) {
    el[key].addEventListener("input", function () {
      state.sizeId = "";
      paintChips();
      if (!el.atManual.checked) refreshAt();
      if (state.live) calculate(false);
    });
  });

  ["at", "Fmax", "Fmin", "Fpreload", "kt", "targetCycles"].forEach(function (key) {
    el[key].addEventListener("input", function () {
      if (state.live) calculate(false);
    });
  });

  ["loadType", "surface", "meanMethod", "fUnit"].forEach(function (key) {
    el[key].addEventListener("change", function () {
      if (key === "fUnit") {
        var next = el.fUnit.value;
        if (next !== lastFUnit) {
          ["Fmax", "Fmin", "Fpreload"].forEach(function (fk) {
            var F = num(el[fk]);
            if (isFinite(F)) el[fk].value = roundSmart(convertForceUnitValue(F, lastFUnit, next));
          });
          lastFUnit = next;
        }
      }
      if (state.live) calculate(false);
    });
  });

  root.addEventListener("keydown", function (e) {
    if (e.key === "Enter" && e.target && e.target.tagName === "INPUT") {
      e.preventDefault();
      calculate(true);
    }
  });

  window.bflSwitchUnit = switchUnit;
  window.bflReset = resetAll;
  window.bflCalculate = function () { calculate(true); };

  updateUnitLabels();
  renderSizeChips();
  applyGrade();
  refreshAt();
})();


Bolt Fatigue Life Calculator

Input parameters

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Bruce Li

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Input parameters

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Tags :

Bruce Li

Bolt Shear Strength Calculator

Multi-Bolt Joint Load Distribution Calculator

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