Bolt Torque ↔ Preload Conversion Calculator

En Bolt Torque ↔ Preload Conversion Calculator is a practical engineering tool designed to convert tightening torque into bolt preload force and calculate the required torque based on a target clamping force. By considering key parameters such as bolt diameter, friction coefficient, lubrication condition, and fastener properties, this calculator helps engineers achieve accurate bolt tightening results. The Bolt Torque ↔ Preload Conversion Calculator supports mechanical assembly design, maintenance operations, and fastener selection while reducing the risk of loose connections, insufficient clamping force, excessive stress, and bolt failure.

Bolt Torque ↔ Preload Conversion Calculator | Bolt Torque Calculator

Input parameters

1 Calculation mode

2 Bolt geometry

Bolt thread type ?Metric ISO threads use pitch in mm. UNC and UNF use threads per inch (TPI). Custom lets you type any pitch or TPI for special fasteners.

Bolt diameter ?Nominal major diameter d. For metric bolts this is the M-size (12 mm for M12). Must be greater than zero. Used as d in T = K × F × d (converted to metres).

Thread pitch ?Metric: distance between threads in mm (M12 coarse = 1.75 mm). UNC/UNF: threads per inch, e.g. 13 TPI for ½″-13. Used to estimate tensile stress area At.

3 Material grade

Bolt material grade ?ISO 898-1 property classes 8.8 / 10.9 / 12.9 and stainless A2-70. Strength is used to rate preload against proof or yield. Choose Custom to type catalog values.

Yield strength S_y ?Minimum yield or 0.2% proof stress. Grade 10.9 is typically 940 MPa. Yield load F_y = A_t × S_y.

Proof strength S_pag (optional) ?ISO 898-1 proof stress. Grade 10.9 is typically 830 MPa. Safety status is compared with proof load when this value is set; otherwise yield is used.

4 Friction & nut factor

Lubrication condition ?Sets a typical nut factor K. Dry ≈ 0.28, light oil ≈ 0.20, standard lubrication ≈ 0.18, anti-seize ≈ 0.12. Actual K varies with finish, plating, and tool scatter.

Nut factor K ?Torque coefficient in T = K × F × d. Typical as-received steel is about 0.20. Dry joints run higher; oil or anti-seize lowers K. Engineering range is roughly 0.10–0.30. Friction coefficient μ (optional) ?Advanced input. If entered, K is replaced by the Motosh estimate from thread pitch, pitch diameter, and bearing friction (μ_t = μ_b = μ). Leave blank to use the nut factor directly.

5 Tightening torque

Tightening torque ?Applied installation torque T. Used in Torque → Preload mode: F = T / (K × d). Enter N·m or lbf·ft; the calculator converts automatically.

Target preload force ?Desired bolt tension / clamp force F. Used in Preload → Torque mode: T = K × F × d. Enter N, kN, or lbf.

Torque to preload: F = T / (K × d). Used by this Bolt Torque Calculator when converting applied wrench torque into estimated clamp force.

Calculated results

Calculated bolt preload

—

N / kN / lbf

Required tightening torque

—

N·m / lbf·ft

Torque gauge

—

relative to 100% proof torque

—

Preload force

Bolt stress percentage —

< 50% low clamp 50–85% typical 85–100% upper limit

Bolt tensile stress

—

MPa / psi

Torque coefficient K

—

selected nut factor

Estimated clamping force

—

joint clamp load

Tensile stress area

—

from d and pitch

Bolt yield load

—

F_y = A_t × S_y

Bolt proof load

—

F_pag = A_t × S_pag

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  var root = document.getElementById("btp-root");
  if (!root || root.getAttribute("data-btp-ready") === "1") return;
  root.setAttribute("data-btp-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 LBFFT_PER_NM = 0.737562149;

  var LUB = {
    dry:       { k: 0.28, mu: 0.18, label: "Dry" },
    light:     { k: 0.20, mu: 0.12, label: "Light lubrication" },
    standard:  { k: 0.18, mu: 0.10, label: "Standard lubrication" },
    antiseize: { k: 0.12, mu: 0.08, label: "Anti-seize lubrication" },
    custom:    null
  };

  var GRADES = {
    "8.8":  { sy: 640, sp: 600, rm: 800, label: "Grade 8.8" },
    "10.9": { sy: 940, sp: 830, rm: 1040, label: "Grade 10.9" },
    "12.9": { sy: 1100, sp: 970, rm: 1220, label: "Grade 12.9" },
    ss:     { sy: 450, sp: 450, rm: 700, label: "Stainless steel A2-70" },
    custom: null
  };

  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_UNC = [
    { 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 SIZES_UNF = [
    { label: "1/4-28", d: 0.25, tpi: 28 },
    { label: "5/16-24", d: 0.3125, tpi: 24 },
    { label: "3/8-24", d: 0.375, tpi: 24 },
    { label: "1/2-20", d: 0.5, tpi: 20 },
    { label: "5/8-18", d: 0.625, tpi: 18 },
    { label: "3/4-16", d: 0.75, tpi: 16 }
  ];
  var METRIC_COARSE = [
    { d: 5, p: 0.8 }, { d: 6, p: 1 }, { d: 8, p: 1.25 }, { d: 10, p: 1.5 },
    { d: 12, p: 1.75 }, { d: 14, p: 2 }, { d: 16, p: 2 }, { d: 18, p: 2.5 },
    { d: 20, p: 2.5 }, { d: 22, p: 2.5 }, { d: 24, p: 3 }, { d: 27, p: 3 },
    { d: 30, p: 3.5 }, { d: 33, p: 3.5 }, { d: 36, p: 4 }
  ];

  var DEFAULTS = {
    mode: "t2f",
    thread: "metric",
    d: 12,
    dUnit: "mm",
    p: 1.75,
    torque: 80,
    tUnit: "Nm",
    preload: 33.333,
    fUnit: "kN",
    k: 0.20,
    lub: "light",
    mu: "",
    grade: "10.9",
    sy: 940,
    sp: 830,
    size: "M12"
  };

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    p: byId("btpP"),
    pUnit: byId("btpPUnit"),
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    tUnit: byId("btpTUnit"),
    preload: byId("btpPreload"),
    fUnit: byId("btpFUnit"),
    fldTorque: byId("btpFldTorque"),
    fldPreload: byId("btpFldPreload"),
    loadTitle: byId("btpLoadTitle"),
    loadNote: byId("btpLoadNote"),
    lub: byId("btpLub"),
    k: byId("btpK"),
    mu: byId("btpMu"),
    grade: byId("btpGrade"),
    sy: byId("btpSy"),
    sp: byId("btpSp"),
    sUnit: byId("btpSUnit"),
    btnReset: byId("btpBtnReset"),
    btnCalc: byId("btpBtnCalculate"),
    results: byId("btpResults"),
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    statusTitle: byId("btpStatusTitle"),
    statusNote: byId("btpStatusNote"),
    outFi: byId("btpOutFi"),
    outFiSub: byId("btpOutFiSub"),
    outT: byId("btpOutT"),
    outTSub: byId("btpOutTSub"),
    outStress: byId("btpOutStress"),
    outStressNote: byId("btpOutStressNote"),
    outK: byId("btpOutK"),
    outKNote: byId("btpOutKNote"),
    outClamp: byId("btpOutClamp"),
    outClampSub: byId("btpOutClampSub"),
    outAt: byId("btpOutAt"),
    outAtNote: byId("btpOutAtNote"),
    outFy: byId("btpOutFy"),
    outFp: byId("btpOutFp"),
    outUtil: byId("btpOutUtil"),
    utilFill: byId("btpUtilFill"),
    utilLabel: byId("btpUtilLabel"),
    alerts: byId("btpAlerts"),
    gaugeArc: byId("btpGaugeArc"),
    needle: byId("btpNeedle"),
    gaugeRead: byId("btpGaugeRead"),
    gaugeNote: byId("btpGaugeNote"),
    preloadFill: byId("btpPreloadFill"),
    preloadRead: byId("btpPreloadRead"),
    schematic: byId("btpSchematic"),
    heroFi: byId("btpHeroFi"),
    heroT: byId("btpHeroT")
  };

  var state = {
    mode: "t2f",
    sizeId: "M12",
    pitchManual: false,
    applying: false
  };
  var lastFUnit = el.fUnit ? el.fUnit.value : "kN";

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  function clamp(v, a, b) { return Math.max(a, Math.min(b, v)); }

  function roundSmart(v) {
    if (!isFinite(v)) return "";
    var a = Math.abs(v);
    var d = a >= 100 ? 2 : a >= 10 ? 3 : a >= 1 ? 4 : 5;
    return String(Number(v.toFixed(d)));
  }

  function fmt(v, d) {
    if (!isFinite(v)) return "-";
    return v.toLocaleString("en-US", { maximumFractionDigits: d, minimumFractionDigits: 0 });
  }

  function setErr(key, msg) {
    var node = byId("btpErr" + key);
    var map = { D: el.d, P: el.p, T: el.torque, F: el.preload, K: el.k, Mu: el.mu, Sy: el.sy, Sp: el.sp };
    var input = map[key];
    if (node) node.textContent = msg || "";
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  function currentSizeList() {
    var t = el.thread.value;
    if (t === "unc") return SIZES_UNC;
    if (t === "unf") return SIZES_UNF;
    if (t === "metric") return SIZES_M;
    return [];
  }

  function pitchIsTpi() {
    return el.thread.value === "unc" || el.thread.value === "unf" || (el.thread.value === "custom" && el.pUnit.value === "tpi");
  }

  function updatePitchUnit() {
    var t = el.thread.value;
    var custom = t === "custom";
    if (el.pUnitWrap) el.pUnitWrap.classList.toggle("btp-hidden", !custom);
    if (el.pUnitPill) el.pUnitPill.classList.toggle("btp-hidden", custom);
    if (!custom) el.pUnit.value = t === "metric" ? "mm" : "tpi";
    if (el.pUnitPill) el.pUnitPill.textContent = pitchIsTpi() ? "TPI" : "mm";
  }

  function nearestMetricPitch(dMm) {
    var best = METRIC_COARSE[0];
    var dist = Math.abs(dMm - best.d);
    for (var i = 1; i < METRIC_COARSE.length; i++) {
      var dd = Math.abs(dMm - METRIC_COARSE[i].d);
      if (dd < dist) { dist = dd; best = METRIC_COARSE[i]; }
    }
    return best.p;
  }

  function nearestUnPitch(dIn, list) {
    var best = list[0];
    var dist = Math.abs(dIn - best.d);
    for (var i = 1; i < list.length; i++) {
      var dd = Math.abs(dIn - list[i].d);
      if (dd < dist) { dist = dd; best = list[i]; }
    }
    return best.tpi;
  }

  function autoPitch() {
    if (state.pitchManual || el.thread.value === "custom") return;
    var d = num(el.d);
    if (!(d > 0)) return;
    var t = el.thread.value;
    if (t === "metric") {
      var dMm = el.dUnit.value === "mm" ? d : d * MM_PER_IN;
      el.p.value = String(nearestMetricPitch(dMm));
    } else if (t === "unc") {
      var dIn = el.dUnit.value === "in" ? d : d / MM_PER_IN;
      el.p.value = String(nearestUnPitch(dIn, SIZES_UNC));
    } else if (t === "unf") {
      var dIn2 = el.dUnit.value === "in" ? d : d / MM_PER_IN;
      el.p.value = String(nearestUnPitch(dIn2, SIZES_UNF));
    }
  }

  function renderSizeChips() {
    var list = currentSizeList();
    el.sizeChips.innerHTML = "";
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      el.sizeChips.classList.add("btp-hidden");
      return;
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      var btn = document.createElement("button");
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      btn.textContent = s.label;
      btn.addEventListener("click", function () {
        state.sizeId = s.label;
        state.pitchManual = false;
        state.applying = true;
        if (el.thread.value === "metric") {
          el.dUnit.value = "mm";
          el.d.value = String(s.d);
          el.p.value = String(s.p);
        } else {
          el.dUnit.value = "in";
          el.d.value = String(s.d);
          el.p.value = String(s.tpi);
        }
        state.applying = false;
        updatePitchUnit();
        paintChips();
      });
      el.sizeChips.appendChild(btn);
    });
  }

  function paintChips() {
    el.sizeChips.querySelectorAll(".btp-chip").forEach(function (btn) {
      btn.classList.toggle("btp-is-active", btn.textContent === state.sizeId);
    });
  }

  function applyGrade() {
    var g = GRADES[el.grade.value];
    if (!g) return;
    state.applying = true;
    var metricS = el.sUnit.value === "MPa";
    el.sy.value = metricS ? String(g.sy) : roundSmart(g.sy * PSI_PER_MPA);
    el.sp.value = metricS ? String(g.sp) : roundSmart(g.sp * PSI_PER_MPA);
    el.sy.readOnly = true;
    el.sp.readOnly = true;
    state.applying = false;
  }

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

  function applyLubrication() {
    var spec = LUB[el.lub.value];
    if (!spec) return;
    state.applying = true;
    el.k.value = spec.k.toFixed(2);
    el.mu.placeholder = spec.mu.toFixed(2);
    if (el.mu.value !== "") el.mu.value = spec.mu.toFixed(2);
    state.applying = false;
  }

  function markCustomLub() {
    if (state.applying) return;
    if (el.lub.value !== "custom") el.lub.value = "custom";
  }

  function setMode(mode) {
    state.mode = mode;
    var t2f = mode === "t2f";
    el.modeT2F.classList.toggle("btp-is-active", t2f);
    el.modeF2T.classList.toggle("btp-is-active", !t2f);
    el.fldTorque.classList.toggle("btp-hidden", !t2f);
    el.fldPreload.classList.toggle("btp-hidden", t2f);
    if (el.loadTitle) {
      el.loadTitle.textContent = t2f ? "Tightening torque" : "Target preload force";
    }
    if (el.loadNote) {
      el.loadNote.textContent = t2f
        ? "Torque to preload: F = T / (K x d). Used by this Bolt Torque Calculator when converting applied wrench torque into estimated clamp force."
        : "Preload to torque: T = K x F x d. Used by this Bolt Preload Calculator when a target clamp force is specified.";
    }
    el.modeT2F.setAttribute("aria-pressed", t2f ? "true" : "false");
    el.modeF2T.setAttribute("aria-pressed", t2f ? "false" : "true");
  }

  function dToMm() {
    var d = num(el.d);
    if (!(d > 0)) return NaN;
    return el.dUnit.value === "in" ? d * MM_PER_IN : d;
  }

  function pToMm() {
    var p = num(el.p);
    if (!(p > 0)) return NaN;
    return pitchIsTpi() ? MM_PER_IN / p : p;
  }

  function torqueToNm() {
    var t = num(el.torque);
    if (!isFinite(t)) return NaN;
    return el.tUnit.value === "lbfft" ? t / LBFFT_PER_NM : t;
  }

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

  function strengthToMPa(node) {
    var v = num(node);
    if (!isFinite(v) || v <= 0) return NaN;
    return el.sUnit.value === "psi" ? v / PSI_PER_MPA : v;
  }

  function tensileAreaMm2(dMm, pMm) {
    if (!(dMm > 0) || !(pMm > 0)) return NaN;
    var core = dMm - 0.9382 * pMm;
    if (!(core > 0)) return NaN;
    return Math.PI / 4 * core * core;
  }

  function kFromMu(dMm, pMm, mu) {
    var d2 = dMm - 0.6495 * pMm;
    var Dm = 1.3 * dMm;
    if (!(dMm > 0) || !(d2 > 0)) return NaN;
    return (pMm / (2 * Math.PI) + 0.577 * mu * d2 + 0.5 * mu * Dm) / dMm;
  }

  function formatForce(N) {
    if (!isFinite(N)) return { primary: "-", secondary: "" };
    var imperial = el.dUnit.value === "in" || el.fUnit.value === "lbf";
    if (imperial) {
      return { primary: fmt(N * LBF_PER_N, 1) + " lbf", secondary: fmt(N / 1000, 2) + " kN  /  " + fmt(N, 0) + " N" };
    }
    if (Math.abs(N) >= 1000) {
      return { primary: fmt(N / 1000, 2) + " kN", secondary: fmt(N, 0) + " N  /  " + fmt(N * LBF_PER_N, 1) + " lbf" };
    }
    return { primary: fmt(N, 1) + " N", secondary: fmt(N * LBF_PER_N, 1) + " lbf" };
  }

  function formatTorque(Nm) {
    if (!isFinite(Nm)) return { primary: "-", secondary: "" };
    var ft = Nm * LBFFT_PER_NM;
    if (el.tUnit.value === "lbfft" || el.dUnit.value === "in") {
      return { primary: fmt(ft, 2) + " lbf-ft", secondary: fmt(Nm, 2) + " N-m" };
    }
    return { primary: fmt(Nm, 2) + " N-m", secondary: fmt(ft, 2) + " lbf-ft" };
  }

  function formatStress(MPa) {
    if (!isFinite(MPa)) return { primary: "-", secondary: "" };
    if (el.sUnit.value === "psi" || el.dUnit.value === "in") {
      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 (el.dUnit.value === "in") return fmt(mm2 / MM2_PER_IN2, 4) + " in2";
    return fmt(mm2, 1) + " mm2";
  }

  function convertDUnit(next) {
    if (next === el.dUnit.value) return;
    var d = num(el.d);
    var prev = el.dUnit.value;
    if (isFinite(d)) {
      el.d.value = next === "in" ? roundSmart(d / MM_PER_IN) : roundSmart(d * MM_PER_IN);
    }
    el.dUnit.value = next;
    if (prev !== next) state.sizeId = "";
    paintChips();
  }

  function convertFUnit(next) {
    var f = num(el.preload);
    var from = el.fUnit.value;
    if (from === next) return;
    if (isFinite(f)) {
      var n = f;
      if (from === "kN") n *= 1000;
      if (from === "lbf") n /= LBF_PER_N;
      if (next === "kN") n /= 1000;
      if (next === "lbf") n *= LBF_PER_N;
      el.preload.value = roundSmart(n);
    }
    el.fUnit.value = next;
  }

  function convertTUnit(next) {
    var t = num(el.torque);
    var from = el.tUnit.value;
    if (from === next) return;
    if (isFinite(t)) {
      var nm = from === "lbfft" ? t / LBFFT_PER_NM : t;
      el.torque.value = next === "lbfft" ? roundSmart(nm * LBFFT_PER_NM) : roundSmart(nm);
    }
    el.tUnit.value = next;
  }

  function convertSUnit(next) {
    var from = el.sUnit.value;
    if (from === next) return;
    var sy = num(el.sy);
    var sp = num(el.sp);
    if (isFinite(sy)) {
      el.sy.value = next === "psi" ? roundSmart(sy * PSI_PER_MPA) : roundSmart(sy / PSI_PER_MPA);
    }
    if (isFinite(sp) && sp > 0) {
      el.sp.value = next === "psi" ? roundSmart(sp * PSI_PER_MPA) : roundSmart(sp / PSI_PER_MPA);
    }
    el.sUnit.value = next;
    var pill = byId("btpSpUnitPill");
    if (pill) pill.textContent = next;
  }

  function onThreadChange() {
    var t = el.thread.value;
    state.pitchManual = t === "custom";
    state.sizeId = "";
    if (t === "metric") {
      convertDUnit("mm");
      el.pUnit.value = "mm";
    } else if (t === "unc" || t === "unf") {
      convertDUnit("in");
      el.pUnit.value = "tpi";
    }
    updatePitchUnit();
    renderSizeChips();
    autoPitch();
  }

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

    if (el.d.value === "" || !isFinite(num(el.d))) {
      setErr("D", "Enter a bolt diameter."); ok = false;
    } else if (!(si.dMm > 0)) {
      setErr("D", "Bolt diameter must be greater than zero."); ok = false;
    } else if (si.dMm < 1.5 || si.dMm > 150) {
      setErr("D", "Diameter looks unrealistic. Enter a nominal size between about 2 mm and 150 mm (or equivalent inches)."); ok = false;
    }

    if (el.p.value === "" || !isFinite(num(el.p))) {
      setErr("P", pitchIsTpi() ? "Enter threads per inch (TPI)." : "Enter thread pitch."); ok = false;
    } else if (!(si.pMm > 0)) {
      setErr("P", "Pitch must be greater than zero."); ok = false;
    } else if (!pitchIsTpi() && si.dMm > 0 && si.pMm >= si.dMm) {
      setErr("P", "Pitch must be smaller than the bolt diameter."); ok = false;
    } else if (si.dMm > 0 && si.pMm > 0 && (si.dMm - 0.9382 * si.pMm) <= 0) {
      setErr("P", "Pitch is too large for this diameter; tensile area would be zero."); ok = false;
    }

    if (state.mode === "t2f") {
      if (el.torque.value === "" || !isFinite(num(el.torque))) {
        setErr("T", "Enter tightening torque."); ok = false;
      } else if (!(si.T > 0)) {
        setErr("T", "Torque must be greater than zero."); ok = false;
      }
    } else {
      if (el.preload.value === "" || !isFinite(num(el.preload))) {
        setErr("F", "Enter target preload force."); ok = false;
      } else if (!(si.F > 0)) {
        setErr("F", "Preload force must be greater than zero."); ok = false;
      }
    }

    var muRaw = el.mu.value === "" ? NaN : num(el.mu);
    var k = num(el.k);
    if (el.mu.value !== "") {
      if (!(muRaw > 0 && muRaw < 1)) {
        setErr("Mu", "Friction coefficient must be between 0 and 1."); ok = false;
      }
    } else if (!(k > 0)) {
      setErr("K", "Nut factor K must be greater than zero."); ok = false;
    }

    if (!(si.sy > 0)) {
      setErr("Sy", "Yield strength must be greater than zero."); ok = false;
    }
    if (el.sp.value !== "" && !(si.sp > 0)) {
      setErr("Sp", "Proof strength must be positive, or left blank."); ok = false;
    }

    return ok;
  }

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

  function setPreloadBar(frac) {
    var f = clamp(isFinite(frac) ? frac : 0, 0, 1);
    if (el.preloadFill) el.preloadFill.style.height = (f * 100) + "%";
  }

  function setSchematic(status) {
    if (!el.schematic) return;
    el.schematic.setAttribute("data-status", status || "idle");
  }

  function calculate(scroll) {
    var dMm = dToMm();
    var pMm = pToMm();
    var T = torqueToNm();
    var F = preloadToN();
    var sy = strengthToMPa(el.sy);
    var spRaw = el.sp.value === "" ? NaN : strengthToMPa(el.sp);
    var mu = el.mu.value === "" ? NaN : num(el.mu);
    var kUser = num(el.k);
    var At = tensileAreaMm2(dMm, pMm);
    var useMu = isFinite(mu) && mu > 0;
    var K = kUser;
    var method = "K";

    if (useMu && isFinite(dMm) && isFinite(pMm)) {
      var kMu = kFromMu(dMm, pMm, mu);
      if (isFinite(kMu) && kMu > 0) {
        K = kMu;
        method = "friction";
      }
    }

    var si = { dMm: dMm, pMm: pMm, T: T, F: F, sy: sy, sp: spRaw, K: K, At: At };
    var ok = validate(si);
    el.results.classList.remove("btp-hidden");

    if (!ok) {
      el.statusTitle.textContent = "Check inputs";
      el.statusNote.textContent = "Correct the highlighted fields, then calculate again. Empty, zero, or negative diameter values are not allowed.";
      el.banner.className = "btp-banner btp-banner-caution";
      setGauge(0);
      setPreloadBar(0);
      setSchematic("idle");
      if (scroll) {
        try { el.results.scrollIntoView({ behavior: "smooth", block: "nearest" }); } catch (e) {}
      }
      return;
    }

    var d_m = dMm / 1000;
    if (state.mode === "t2f") {
      F = T / (K * d_m);
    } else {
      T = K * F * d_m;
    }

    var stress = F / At;
    var hasProof = isFinite(spRaw) && spRaw > 0;
    var Fy = At * sy;
    var Fp = hasProof ? At * spRaw : NaN;
    var cap = hasProof ? Fp : Fy;
    var util = F / cap;
    var utilYield = F / Fy;

    var Tcap = K * cap * d_m;
    var Ttyp = K * 0.75 * cap * d_m;
    var gaugeFrac = Ttyp > 0 ? T / (K * cap * d_m) : 0;

    var alerts = [];
    var status = "safe";
    var title = "Safe";
    var note = "Estimated preload is within the recommended range and below bolt " + (hasProof ? "proof" : "yield") + " capacity.";

    if (K < 0.10 || K > 0.30) {
      alerts.push({ type: "warn", text: "Nut factor K = " + fmt(K, 3) + " is outside the typical 0.10-0.30 engineering range. Torque scatter will be large unless friction is measured." });
    }
    if (method === "friction") {
      alerts.push({ type: "ok", text: "Torque-preload conversion uses the Motosh friction formula with mu = " + fmt(mu, 3) + ". Equivalent nut factor K = " + fmt(K, 3) + "." });
    }
    if (state.mode === "t2f" && T > 3 * Ttyp && Ttyp > 0) {
      alerts.push({ type: "warn", text: "Entered torque is much higher than a typical 75% proof-load torque for this bolt (" + formatTorque(Ttyp).primary + "). Check units and lubrication." });
    }
    if (state.mode === "t2f" && dMm >= 8 && T < 0.15 * Ttyp && Ttyp > 0) {
      alerts.push({ type: "warn", text: "Entered torque is very low for this bolt size. Resulting clamp force may not resist loosening." });
    }

    if (util >= 1 || F >= cap) {
      status = "risk";
      title = "Overloaded";
      note = "Estimated preload reaches or exceeds bolt " + (hasProof ? "proof" : "yield") + " strength. Reduce torque, improve lubrication (lower K), or use a stronger / larger fastener.";
      alerts.unshift({ type: "risk", text: "Preload " + formatForce(F).primary + " meets or exceeds bolt capacity " + formatForce(cap).primary + "." });
    } else if (util >= 0.85) {
      status = "caution";
      title = "Warning";
      note = "Preload approaches allowable bolt capacity. Confirm friction, tool scatter, and manufacturer torque tables before assembly.";
      alerts.unshift({ type: "warn", text: "Utilization is " + fmt(util * 100, 1) + "% of " + (hasProof ? "proof" : "yield") + " load. Controlled tightening is recommended." });
    } else if (util < 0.40) {
      status = "caution";
      title = "Warning";
      note = "Estimated clamp force is below 40% of bolt " + (hasProof ? "proof" : "yield") + " capacity. Joints may loosen under vibration or cyclic load.";
      alerts.unshift({ type: "warn", text: "Preload is only " + fmt(util * 100, 1) + "% of capacity. Insufficient preload is a common cause of joint loosening." });
    } else if (K < 0.10 || K > 0.30) {
      status = "caution";
      title = "Warning";
      note = "Preload magnitude is acceptable, but the nut factor is outside the usual range. Treat the conversion as a rough estimate.";
    } else {
      status = "safe";
      title = "Safe";
      if (util < 0.50) {
        note = "Preload is below 50% of bolt capacity, so the fastener is not overloaded. Confirm clamp force is still enough to resist loosening.";
        alerts.unshift({ type: "warn", text: "Preload is " + fmt(util * 100, 1) + "% of " + (hasProof ? "proof" : "yield") + " capacity. Check loosening if the joint sees vibration." });
      } else {
        note = "Estimated preload is in a typical 50-85% capacity band for reusable joints. Verify with applicable standards for critical connections.";
      }
    }

    if (utilYield >= 1.2) {
      alerts.push({ type: "risk", text: "Tensile stress exceeds 120% of yield. The torque or preload input is unrealistic for this bolt grade." });
    }

    var fiFmt = formatForce(F);
    var tFmt = formatTorque(T);
    var sFmt = formatStress(stress);

    el.outFi.textContent = fiFmt.primary;
    el.outFiSub.textContent = fiFmt.secondary || "Bolt preload F";
    el.outT.textContent = tFmt.primary;
    el.outTSub.textContent = (tFmt.secondary ? tFmt.secondary + "  -  " : "") + (method === "friction" ? "from mu and thread geometry" : "from T = K x F x d");
    el.outStress.textContent = sFmt.primary;
    el.outStressNote.textContent = (sFmt.secondary ? sFmt.secondary + "  -  " : "") + "sigma = F / At";
    el.outK.textContent = fmt(K, 3);
    el.outKNote.textContent = method === "friction" ? "equivalent K from friction" : "selected nut factor";
    el.outClamp.textContent = fiFmt.primary;
    el.outClampSub.textContent = "Joint clamping force (equals bolt preload)";
    el.outAt.textContent = formatArea(At);
    el.outAtNote.textContent = "At from diameter and pitch";
    el.outFy.textContent = formatForce(Fy).primary;
    el.outFp.textContent = hasProof ? formatForce(Fp).primary : "-";

    var utilPct = util * 100;
    el.outUtil.textContent = fmt(utilPct, 1) + "% of " + (hasProof ? "proof" : "yield");
    el.utilFill.style.width = clamp(utilPct, 0, 100) + "%";
    el.utilFill.className = "btp-util-fill" + (status === "risk" ? " btp-is-risk" : status === "caution" ? " btp-is-caution" : " btp-is-ok");
    if (el.utilLabel) el.utilLabel.textContent = fmt(utilPct, 1) + "%";

    setGauge(clamp(gaugeFrac, 0, 1.05));
    setPreloadBar(clamp(util, 0, 1));
    if (el.preloadFill) {
      el.preloadFill.className = "btp-pbar-fill" + (status === "risk" ? " btp-is-risk" : status === "caution" ? " btp-is-caution" : " btp-is-ok");
    }
    setSchematic(status === "risk" ? "risk" : status === "caution" ? "caution" : "ok");

    if (el.gaugeRead) el.gaugeRead.textContent = tFmt.primary;
    if (el.gaugeNote) el.gaugeNote.textContent = "vs " + formatTorque(Tcap).primary + " at 100% " + (hasProof ? "proof" : "yield");
    if (el.preloadRead) el.preloadRead.textContent = fiFmt.primary;

    el.heroFi.classList.toggle("btp-is-accent", state.mode === "t2f");
    el.heroT.classList.toggle("btp-is-accent", state.mode === "f2t");

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

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

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

  function resetAll() {
    state.mode = DEFAULTS.mode;
    state.sizeId = DEFAULTS.size;
    state.pitchManual = false;
    el.thread.value = DEFAULTS.thread;
    el.dUnit.value = DEFAULTS.dUnit;
    el.d.value = String(DEFAULTS.d);
    el.pUnit.value = "mm";
    el.p.value = String(DEFAULTS.p);
    el.tUnit.value = DEFAULTS.tUnit;
    el.torque.value = String(DEFAULTS.torque);
    el.fUnit.value = DEFAULTS.fUnit;
    lastFUnit = DEFAULTS.fUnit;
    el.preload.value = String(DEFAULTS.preload);
    el.lub.value = DEFAULTS.lub;
    el.k.value = Number(DEFAULTS.k).toFixed(2);
    el.mu.value = "";
    el.grade.value = DEFAULTS.grade;
    el.sUnit.value = "MPa";
    applyGrade();
    applyLubrication();
    updatePitchUnit();
    renderSizeChips();
    setMode(DEFAULTS.mode);
    clearErrs();
    el.results.classList.add("btp-hidden");
    setGauge(0);
    setPreloadBar(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 === "btpBtnModeT2F") {
      e.preventDefault();
      setMode("t2f");
    } else if (btn.id === "btpBtnModeF2T") {
      e.preventDefault();
      setMode("f2t");
    } else if (btn.id === "btpBtnReset") {
      e.preventDefault();
      resetAll();
    } else if (btn.id === "btpBtnCalculate") {
      e.preventDefault();
      calculate(true);
    }
  }

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

  el.thread.addEventListener("change", onThreadChange);
  el.pUnit.addEventListener("change", function () {
    state.pitchManual = true;
    updatePitchUnit();
  });
  el.d.addEventListener("input", function () {
    state.sizeId = "";
    paintChips();
    autoPitch();
  });
  el.p.addEventListener("input", function () {
    if (!state.applying) state.pitchManual = true;
  });
  el.dUnit.addEventListener("change", function () {
    var next = el.dUnit.value;
    var cur = next === "mm" ? "in" : "mm";
    el.dUnit.value = cur;
    convertDUnit(next);
  });
  el.tUnit.addEventListener("change", function () {
    var next = el.tUnit.value;
    var cur = next === "Nm" ? "lbfft" : "Nm";
    el.tUnit.value = cur;
    convertTUnit(next);
  });
  el.fUnit.addEventListener("change", function () {
    var next = el.fUnit.value;
    if (next === lastFUnit) return;
    el.fUnit.value = lastFUnit;
    convertFUnit(next);
    lastFUnit = next;
  });
  el.sUnit.addEventListener("change", function () {
    var next = el.sUnit.value;
    var cur = next === "MPa" ? "psi" : "MPa";
    el.sUnit.value = cur;
    convertSUnit(next);
  });

  el.lub.addEventListener("change", applyLubrication);
  el.k.addEventListener("input", function () {
    markCustomLub();
    if (!state.applying && el.mu.value !== "") el.mu.value = "";
  });
  el.mu.addEventListener("input", function () {
    markCustomLub();
    var mu = num(el.mu);
    var dMm = dToMm();
    var pMm = pToMm();
    if (isFinite(mu) && mu > 0 && isFinite(dMm) && isFinite(pMm)) {
      var kMu = kFromMu(dMm, pMm, mu);
      if (isFinite(kMu)) {
        state.applying = true;
        el.k.value = kMu.toFixed(3);
        state.applying = false;
      }
    }
  });
  el.grade.addEventListener("change", function () {
    if (el.grade.value === "custom") {
      el.sy.readOnly = false;
      el.sp.readOnly = false;
    } else {
      applyGrade();
    }
  });
  el.sy.addEventListener("input", markCustomGrade);
  el.sp.addEventListener("input", markCustomGrade);

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

  window.btpSwitchMode = setMode;
  window.btpReset = resetAll;
  window.btpCalculate = function () { calculate(true); };

  updatePitchUnit();
  renderSizeChips();
  applyGrade();
  applyLubrication();
  setMode(DEFAULTS.mode);
})();


Bolt Torque ↔ Preload Conversion Calculator

Input parameters

Etiquetas:

Bruce Li

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Input parameters

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Etiquetas:

Bruce Li

Bolt Preload Calculator

Bolt Tensile Strength Check Calculator

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