Bolt Preload Calculator

The Bolt Preload Calculator is a practical engineering tool designed to estimate the required preload force and tightening torque for bolted connections. By considering bolt diameter, thread pitch, material strength, preload percentage, and friction conditions, it helps engineers determine suitable bolt tension and clamping force for reliable assemblies. The Bolt Preload Calculator supports mechanical design, installation, and maintenance while helping reduce the risks of bolt loosening, insufficient clamping, excessive stress, fatigue damage, and premature joint failure.

Bolt Preload Calculator | Bolt Tightening Torque & Clamp Force

Input parameters

1 Bolt geometry

Bolt diameter ?Nominal major diameter d. For metric bolts this is the M-size (e.g. 12 mm for M12). For UN bolts enter the nominal inch size.

Thread pitch ?Metric: distance between threads in mm (M12 coarse = 1.75 mm). Imperial: threads per inch (TPI), e.g. 13 for ½″-13 UNC.

Tensile stress area A_t ?Effective tensile area of the threaded section. Auto-calculated from diameter and pitch, or enter a catalog / ISO 898 value manually.

mm²

Enter A_t manually

Metric: A_t = π/4 × (d − 0.9382 p)². UN: A_t = π/4 × (d − 0.9743/n)². ISO 898-1 M12 coarse is 84.3 mm².

2 Material strength

Yield strength S_y ?Minimum yield or 0.2% proof stress of the bolt material. Property class 8.8 is typically 640 MPa. Used for yield load F_y = A_t × S_y.

MPa

Proof strength S_p (optional) ?Bolt proof stress from ISO 898-1 or SAE J429. When entered, target preload is taken as a percentage of proof strength rather than yield. Leave blank to use yield strength.

MPa

3 Target preload

Target preload percentage ?Preload as a percentage of proof strength (if entered) or yield strength. Common targets: 50–60% conservative, 65–75% general joints, 75–85% controlled structural assemblies. 75%

4 Friction & tightening

Lubrication condition Nut factor K ?Torque coefficient in T = K × F_i × d. Typical as-received steel is about 0.20. Dry joints run higher; oil or anti-seize lowers K. Reasonable engineering range is roughly 0.10–0.30.

Thread friction μ_t (optional) ?Coefficient of friction in the threads. If both μ_t and μ_b are entered, torque is calculated from the VDI / Shigley friction formula instead of K. Bearing friction μ_b (optional) ?Friction under the nut or bolt head bearing face. Typical dry steel ≈ 0.15–0.20; lubricated ≈ 0.08–0.12. Mean bearing diameter is estimated as 1.3 d.

When both friction coefficients are provided, tightening torque uses T = F_i [p / 2π + 0.577 μ_t d₂ + 0.5 μ_b D_m]. Otherwise the simplified relation T = K F_i d is used.

5 Joint load (optional)

External tensile load ?Total external tensile load on the joint, shared by the number of bolts. The calculator uses a simplified F_i + F_ext/n check. Real load split depends on bolt and joint stiffness.

Number of bolts ?Bolts assumed to share the external tensile load equally. Geometry, pattern, and prying can make the most highly loaded bolt see more than F_ext / n.

Calculated results

Recommended bolt preload

—

Clamp / tension force F_i

Recommended tightening torque

—

Installation torque T

Bolt tensile stress

—

σ = F_i / A_t

Preload utilization —

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

Bolt yield load

—

F_y = A_t × S_y

Bolt proof load

—

F_p = A_t × S_p

Preload percentage

—

of proof or yield

External load per bolt

—

F_ext / n

Tensile stress area

—

from d and pitch

Equivalent nut factor

—

K = T / (F_i d)

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  var root = document.getElementById("bpc-root");
  if (!root || root.getAttribute("data-bpc-ready") === "1") return;
  root.setAttribute("data-bpc-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, mut: 0.18, mub: 0.18 },
    light:     { k: 0.20, mut: 0.12, mub: 0.12 },
    lub:       { k: 0.18, mut: 0.10, mub: 0.10 },
    antiseize: { k: 0.12, mut: 0.08, mub: 0.08 },
    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_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 = [
    { id: "8.8", label: "8.8", syMPa: 640, spMPa: 600 },
    { id: "10.9", label: "10.9", syMPa: 940, spMPa: 830 },
    { id: "12.9", label: "12.9", syMPa: 1100, spMPa: 970 },
    { id: "gr5", label: "SAE 5", syMPa: 634.3, spMPa: 586.1 },
    { id: "gr8", label: "SAE 8", syMPa: 896.3, spMPa: 827.4 }
  ];

  var DEFAULTS = {
    unit: "metric",
    d: 12,
    p: 1.75,
    atManual: false,
    sy: 640,
    sp: 600,
    preload: 75,
    lub: "light",
    k: 0.20,
    mut: "",
    mub: "",
    fext: "",
    fextUnit: "kN",
    nbolts: 1,
    size: "M12",
    grade: "8.8"
  };

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    p: byId("bpcP"),
    at: byId("bpcAt"),
    atManual: byId("bpcAtManual"),
    sy: byId("bpcSy"),
    sp: byId("bpcSp"),
    preload: byId("bpcPreload"),
    preloadRange: byId("bpcPreloadRange"),
    preloadVal: byId("bpcPreloadVal"),
    lub: byId("bpcLub"),
    k: byId("bpcK"),
    mut: byId("bpcMut"),
    mub: byId("bpcMub"),
    fext: byId("bpcFext"),
    fextUnit: byId("bpcFextUnit"),
    nbolts: byId("bpcNbolts"),
    btnMetric: byId("bpcBtnMetric"),
    btnImperial: byId("bpcBtnImperial"),
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    outStressNote: byId("bpcOutStressNote"),
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    utilFill: byId("bpcUtilFill"),
    outFy: byId("bpcOutFy"),
    outFp: byId("bpcOutFp"),
    proofTile: byId("bpcProofTile"),
    outPct: byId("bpcOutPct"),
    outPctNote: byId("bpcOutPctNote"),
    outFext: byId("bpcOutFext"),
    extTile: byId("bpcExtTile"),
    outAt: byId("bpcOutAt"),
    outAtNote: byId("bpcOutAtNote"),
    outKeq: byId("bpcOutKeq"),
    alerts: byId("bpcAlerts"),
    gaugeArc: byId("bpcGaugeArc"),
    needle: byId("bpcNeedle")
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  var state = {
    unit: "metric",
    sizeId: "M12",
    gradeId: "8.8",
    applyingLub: false
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    var d = a >= 100 ? 2 : a >= 10 ? 3 : a >= 1 ? 4 : 5;
    var n = Number(v.toFixed(d));
    return String(n);
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    return v.toLocaleString("en-US", { maximumFractionDigits: d, minimumFractionDigits: 0 });
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    var input = el[key.charAt(0).toLowerCase() + key.slice(1)];
    if (key === "D") input = el.d;
    if (key === "P") input = el.p;
    if (key === "At") input = el.at;
    if (key === "Sy") input = el.sy;
    if (key === "Sp") input = el.sp;
    if (key === "Preload") input = el.preload;
    if (key === "K") input = el.k;
    if (key === "Mut") input = el.mut;
    if (key === "Mub") input = el.mub;
    if (key === "Fext") input = el.fext;
    if (key === "Nbolts") input = el.nbolts;
    if (node) node.textContent = msg || "";
    if (input) {
      if (msg) input.classList.add("bpc-invalid");
      else input.classList.remove("bpc-invalid");
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  function clearErrs() {
    ["D", "P", "At", "Sy", "Sp", "Preload", "K", "Mut", "Mub", "Fext", "Nbolts"].forEach(function (k) {
      setErr(k, "");
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  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 ? "mm2" : "in2"; });
    root.querySelectorAll("[data-unit='s']").forEach(function (n) { n.textContent = metric ? "MPa" : "psi"; });
    el.btnMetric.classList.toggle("bpc-is-active", metric);
    el.btnImperial.classList.toggle("bpc-is-active", !metric);
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  function renderSizeChips() {
    var list = state.unit === "metric" ? SIZES_M : SIZES_IN;
    el.sizeChips.innerHTML = "";
    list.forEach(function (s) {
      var btn = document.createElement("button");
      btn.type = "button";
      btn.className = "bpc-chip" + (state.sizeId === s.label ? " bpc-is-active" : "");
      btn.textContent = s.label;
      btn.addEventListener("click", function () {
        state.sizeId = s.label;
        if (state.unit === "metric") {
          el.d.value = String(s.d);
          el.p.value = String(s.p);
        } else {
          el.d.value = String(s.d);
          el.p.value = String(s.tpi);
        }
        if (!el.atManual.checked) refreshAt();
        paintChips();
      });
      el.sizeChips.appendChild(btn);
    });
  }

  function renderGradeChips() {
    el.gradeChips.innerHTML = "";
    GRADES.forEach(function (g) {
      var btn = document.createElement("button");
      btn.type = "button";
      btn.className = "bpc-chip" + (state.gradeId === g.id ? " bpc-is-active" : "");
      btn.textContent = g.label;
      btn.addEventListener("click", function () {
        state.gradeId = g.id;
        if (state.unit === "metric") {
          el.sy.value = String(g.syMPa);
          el.sp.value = String(g.spMPa);
        } else {
          el.sy.value = roundSmart(g.syMPa * PSI_PER_MPA);
          el.sp.value = roundSmart(g.spMPa * PSI_PER_MPA);
        }
        paintChips();
      });
      el.gradeChips.appendChild(btn);
    });
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  function paintChips() {
    el.sizeChips.querySelectorAll(".bpc-chip").forEach(function (btn) {
      btn.classList.toggle("bpc-is-active", btn.textContent === state.sizeId);
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    el.gradeChips.querySelectorAll(".bpc-chip").forEach(function (btn, i) {
      btn.classList.toggle("bpc-is-active", GRADES[i] && GRADES[i].id === state.gradeId);
    });
  }

  function tensileArea(dDisp, pDisp, unit) {
    if (!(dDisp > 0) || !(pDisp > 0)) return NaN;
    var core;
    if (unit === "metric") {
      core = dDisp - 0.9382 * pDisp;
    } else {
      core = 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 toSI() {
    var metric = state.unit === "metric";
    var d = num(el.d);
    var p = num(el.p);
    var at = num(el.at);
    var sy = num(el.sy);
    var sp = num(el.sp);
    var d_mm = metric ? d : d * MM_PER_IN;
    var p_mm = metric ? p : (p > 0 ? MM_PER_IN / p : NaN);
    var at_mm2 = metric ? at : at * MM2_PER_IN2;
    var sy_MPa = metric ? sy : sy / PSI_PER_MPA;
    var sp_MPa = isFinite(sp) && sp > 0 ? (metric ? sp : sp / PSI_PER_MPA) : NaN;
    return { d: d, p: p, at: at, sy: sy, sp: sp, d_mm: d_mm, p_mm: p_mm, at_mm2: at_mm2, sy_MPa: sy_MPa, sp_MPa: sp_MPa };
  }

  function fextToN() {
    var v = num(el.fext);
    if (!isFinite(v) || v === 0) return 0;
    var u = el.fextUnit.value;
    if (u === "kN") return v * 1000;
    if (u === "lbf") return v / LBF_PER_N;
    return v;
  }

  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  -  " + 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;
    var inn = Nm * 8.850745767;
    if (state.unit === "imperial") {
      return { primary: fmt(ft, 2) + " lbf-ft", secondary: fmt(inn, 1) + " lbf-in  -  " + 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 (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) + " in2";
    return fmt(mm2, 1) + " mm2";
  }

  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 switchUnit(next) {
    if (next === state.unit) return;
    var d = num(el.d);
    var p = num(el.p);
    var at = num(el.at);
    var sy = num(el.sy);
    var sp = num(el.sp);
    var fext = num(el.fext);
    var fromFextUnit = el.fextUnit.value;
    var toFextUnit = next === "imperial" ? "lbf" : "kN";

    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(sy)) el.sy.value = roundSmart(sy * PSI_PER_MPA);
      if (isFinite(sp) && sp > 0) el.sp.value = roundSmart(sp * 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(sy)) el.sy.value = roundSmart(sy / PSI_PER_MPA);
      if (isFinite(sp) && sp > 0) el.sp.value = roundSmart(sp / PSI_PER_MPA);
    }

    el.fextUnit.value = toFextUnit;
    if (isFinite(fext)) el.fext.value = roundSmart(convertForceUnitValue(fext, fromFextUnit, toFextUnit));
    state.sizeId = "";

    state.unit = next;
    updateUnitLabels();
    renderSizeChips();
    renderGradeChips();
    if (!el.atManual.checked) refreshAt();
    el.results.classList.add("bpc-hidden");
  }

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

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

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

    if (!(si.d > 0)) { setErr("D", "Diameter must be greater than zero."); ok = false; }
    if (!(si.p > 0)) { setErr("P", state.unit === "metric" ? "Pitch must be greater than zero." : "TPI must be greater than zero."); ok = false; }
    if (state.unit === "metric" && si.d > 0 && si.p > 0 && si.p >= si.d) {
      setErr("P", "Pitch must be smaller than the bolt diameter."); ok = false;
    }
    if (!(si.at > 0)) { setErr("At", "Tensile stress area must be greater than zero."); ok = false; }
    if (!(si.sy > 0)) { setErr("Sy", "Yield strength must be greater than zero."); ok = false; }

    var spRaw = el.sp.value === "" ? NaN : num(el.sp);
    if (el.sp.value !== "" && !(spRaw > 0)) { setErr("Sp", "Proof strength must be positive, or left blank."); ok = false; }

    var pr = num(el.preload);
    if (!(pr > 0) || pr > 150) { setErr("Preload", "Enter a preload percentage between 1 and 150."); ok = false; }

    var k = num(el.k);
    if (!(k > 0)) { setErr("K", "Nut factor K must be greater than zero."); ok = false; }

    var mut = el.mut.value === "" ? NaN : num(el.mut);
    var mub = el.mub.value === "" ? NaN : num(el.mub);
    if (el.mut.value !== "" && !(mut >= 0 && mut < 1)) { setErr("Mut", "Thread friction must be between 0 and 1."); ok = false; }
    if (el.mub.value !== "" && !(mub >= 0 && mub < 1)) { setErr("Mub", "Bearing friction must be between 0 and 1."); ok = false; }

    if (el.fext.value !== "" && !(num(el.fext) >= 0)) { setErr("Fext", "External load cannot be negative."); ok = false; }

    var n = num(el.nbolts);
    if (!(n >= 1) || Math.floor(n) !== n) { setErr("Nbolts", "Number of bolts must be an integer >= 1."); ok = false; }

    if (si.d_mm > 0 && si.p_mm > 0 && (si.d_mm - 0.9382 * si.p_mm) <= 0) {
      setErr("P", "Pitch is too large for this diameter; At would be zero."); ok = false;
    }

    return ok;
  }

  function setGauge(util) {
    var u = clamp(isFinite(util) ? util : 0, 0, 1.15);
    var frac = clamp(u, 0, 1);
    el.gaugeArc.setAttribute("stroke-dashoffset", String(ARC_LEN * (1 - frac)));
    var ang = -90 + clamp(u, 0, 1) * 180;
    el.needle.setAttribute("transform", "rotate(" + ang + " 120 118)");
  }

  function calculate(scroll) {
    refreshAt();
    var si = toSI();
    var ok = validate(si);
    el.results.classList.remove("bpc-hidden");
    if (!ok) {
      el.statusTitle.textContent = "Check inputs";
      el.statusNote.textContent = "Correct the highlighted fields, then calculate again.";
      el.banner.className = "bpc-banner bpc-banner-caution";
      if (scroll) {
        try { el.results.scrollIntoView({ behavior: "smooth", block: "nearest" }); } catch (e) {}
      }
      return;
    }

    var ratio = num(el.preload) / 100;
    var hasProof = isFinite(si.sp_MPa) && si.sp_MPa > 0;
    var S = hasProof ? si.sp_MPa : si.sy_MPa;
    var At = si.at_mm2;
    var Fy = At * si.sy_MPa;
    var Fp = hasProof ? At * si.sp_MPa : NaN;
    var Fi = At * S * ratio;
    var stress = Fi / At;

    var mut = el.mut.value === "" ? NaN : num(el.mut);
    var mub = el.mub.value === "" ? NaN : num(el.mub);
    var k = num(el.k);
    var useFriction = mut > 0 && mub > 0;
    var d_m = si.d_mm / 1000;
    var T;
    var method = "K";

    if (useFriction) {
      var d2 = si.d_mm - 0.6495 * si.p_mm;
      var Dm = 1.3 * si.d_mm;
      var T_Nmm = Fi * (si.p_mm / (2 * Math.PI) + 0.577 * mut * d2 + 0.5 * mub * Dm);
      T = T_Nmm / 1000;
      method = "friction";
    } else {
      T = k * Fi * d_m;
    }
    var Keq = (Fi > 0 && d_m > 0) ? T / (Fi * d_m) : NaN;

    var nBolts = num(el.nbolts);
    var FextTotal = fextToN();
    var hasExt = el.fext.value !== "" && FextTotal > 0;
    var FextBolt = hasExt ? FextTotal / nBolts : 0;
    var Fcombined = Fi + FextBolt;

    var cap = hasProof ? Fp : Fy;
    var utilCap = Fi / cap;
    var utilYield = Fi / Fy;
    var utilCombined = Fcombined / cap;
    var utilShow = hasProof ? (Fi / Fp) : utilYield;

    var alerts = [];
    var status = "safe";
    var title = "Safe";
    var note = "Preload is within the recommended range and below bolt proof/yield capacity.";

    if (k < 0.10 || k > 0.30) {
      alerts.push({ type: "warn", text: "Nut factor K = " + fmt(k, 2) + " is outside the typical 0.10-0.30 engineering range. Torque scatter will be large unless friction is measured." });
    }
    if (ratio < 0.50) {
      alerts.push({ type: "warn", text: "Target preload is below 50%. Clamp force may be insufficient against loosening, vibration, or external load." });
      status = "caution";
    }
    if (ratio > 0.85 && ratio <= 0.90) {
      alerts.push({ type: "warn", text: "Target preload is in the upper 85-90% band. Use only with controlled lubrication and calibrated tightening." });
      status = "caution";
    }
    if (ratio > 0.90) {
      alerts.push({ type: "risk", text: "Target preload exceeds 90% of " + (hasProof ? "proof" : "yield") + " strength." });
      status = "risk";
    }
    if (hasProof && si.sp_MPa > si.sy_MPa) {
      alerts.push({ type: "warn", text: "Proof strength is higher than yield strength. Check the material data." });
    }
    if (el.atManual.checked) {
      var atAuto = tensileArea(si.d, si.p, state.unit);
      if (isFinite(atAuto) && Math.abs(si.at - atAuto) / atAuto > 0.15) {
        alerts.push({ type: "warn", text: "Manual At differs by more than 15% from the pitch formula. Confirm the catalog tensile stress area." });
      }
    }
    if (hasExt) {
      alerts.push({ type: "warn", text: "Combined tensile check uses a simplified Fi + Fext/n model. Real additional bolt load is Phi x Fext, and Phi depends on bolt stiffness, joint stiffness, geometry, and loading." });
    }
    if (useFriction) {
      alerts.push({ type: "ok", text: "Torque from friction formula (mut, mu_b). Equivalent nut factor K = " + fmt(Keq, 3) + "." });
    } else if ((el.mut.value !== "") !== (el.mub.value !== "")) {
      alerts.push({ type: "warn", text: "Enter both thread and bearing friction coefficients to use the advanced torque formula. Tightening torque currently uses T = K x Fi x d." });
    }

    if (Fi >= cap || utilCap >= 1) {
      status = "risk";
      title = "High Risk";
      note = "Calculated preload reaches or exceeds " + (hasProof ? "proof" : "yield") + " capacity. Reduce the preload percentage or use a stronger / larger bolt.";
      alerts.unshift({ type: "risk", text: "Preload Fi = " + formatForce(Fi).primary + " meets or exceeds bolt capacity." });
    } else if (hasExt && Fcombined >= Fy) {
      status = "risk";
      title = "High Risk";
      note = "Simplified combined tensile load (preload + external load per bolt) exceeds yield capacity. The bolt may yield or the joint may unload.";
      alerts.unshift({ type: "risk", text: "Combined load " + formatForce(Fcombined).primary + " exceeds yield load " + formatForce(Fy).primary + "." });
    } else if (utilCap >= 0.85 || utilYield >= 0.85 || (hasExt && utilCombined >= 0.90) || ratio > 0.85 || ratio < 0.50 || k < 0.10 || k > 0.30) {
      if (status !== "risk") {
        status = "caution";
        title = "Caution";
        if (ratio < 0.50) note = "Preload is low relative to recommended practice. Check loosening and fatigue under cyclic load.";
        else if (hasExt && utilCombined >= 0.90) note = "Preload is acceptable in isolation, but the simplified combined tensile load approaches bolt capacity.";
        else note = "Preload approaches the upper recommended strength limit. Confirm friction, tool scatter, and applicable standards.";
      }
    } else {
      status = "safe";
      title = "Safe";
      note = "Preload is within the recommended range and below " + (hasProof ? "proof" : "yield") + " strength.";
    }

    var fiFmt = formatForce(Fi);
    var tFmt = formatTorque(T);
    var sFmt = formatStress(stress);
    el.outFi.textContent = fiFmt.primary;
    el.outFiSub.textContent = fiFmt.secondary || "Clamp / tension force Fi";
    el.outT.textContent = tFmt.primary;
    el.outTSub.textContent = (tFmt.secondary ? tFmt.secondary + " - " : "") + (method === "friction" ? "from mut / mu_b" : "from K x Fi x d");
    el.outStress.textContent = sFmt.primary;
    el.outStressNote.textContent = (sFmt.secondary ? sFmt.secondary + " - " : "") + "sigma = Fi / At";

    el.outFy.textContent = formatForce(Fy).primary;
    if (hasProof) {
      el.proofTile.classList.remove("bpc-hidden");
      el.outFp.textContent = formatForce(Fp).primary;
      el.proofTile.querySelector(".bpc-u").textContent = "Fp = At x Sp";
    } else {
      el.proofTile.classList.add("bpc-hidden");
      el.outFp.textContent = "-";
    }

    var pctLabel = Math.round(ratio * 100) + "%";
    el.outPct.textContent = pctLabel;
    el.outPctNote.textContent = hasProof ? "of proof strength Sp" : "of yield strength Sy";

    if (hasExt) {
      el.extTile.classList.remove("bpc-hidden");
      el.outFext.textContent = formatForce(FextBolt).primary;
      el.extTile.querySelector(".bpc-u").textContent = "plus preload -> " + formatForce(Fcombined).primary;
    } else {
      el.extTile.classList.add("bpc-hidden");
      el.outFext.textContent = "-";
    }

    el.outAt.textContent = formatArea(At);
    el.outAtNote.textContent = el.atManual.checked ? "manual input" : (state.unit === "metric" ? "from d and pitch" : "from d and TPI");
    el.outKeq.textContent = isFinite(Keq) ? fmt(Keq, 3) : "-";

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

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

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

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

  function resetAll() {
    state.unit = "metric";
    state.sizeId = DEFAULTS.size;
    state.gradeId = DEFAULTS.grade;
    el.d.value = String(DEFAULTS.d);
    el.p.value = String(DEFAULTS.p);
    el.atManual.checked = false;
    el.at.readOnly = true;
    el.sy.value = String(DEFAULTS.sy);
    el.sp.value = String(DEFAULTS.sp);
    el.preload.value = String(DEFAULTS.preload);
    el.preloadRange.value = String(DEFAULTS.preload);
    el.preloadVal.textContent = DEFAULTS.preload + "%";
    el.lub.value = DEFAULTS.lub;
    el.k.value = Number(DEFAULTS.k).toFixed(2);
    el.mut.value = "";
    el.mub.value = "";
    applyLubrication();
    el.fext.value = "";
    el.fextUnit.value = DEFAULTS.fextUnit;
    el.nbolts.value = String(DEFAULTS.nbolts);
    updateUnitLabels();
    renderSizeChips();
    renderGradeChips();
    refreshAt();
    el.results.classList.add("bpc-hidden");
  }

  function syncPreloadFromNumber() {
    var v = num(el.preload);
    if (!isFinite(v)) return;
    el.preloadRange.value = String(clamp(v, 50, 90));
    el.preloadVal.textContent = Math.round(v) + "%";
  }

  function syncPreloadFromRange() {
    el.preload.value = el.preloadRange.value;
    el.preloadVal.textContent = el.preloadRange.value + "%";
  }

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

  el.lub.addEventListener("change", function () {
    applyLubrication();
  });

  ["k", "mut", "mub"].forEach(function (key) {
    el[key].addEventListener("input", markCustomLub);
  });

  el.preload.addEventListener("input", syncPreloadFromNumber);
  el.preloadRange.addEventListener("input", syncPreloadFromRange);

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

  ["sy", "sp"].forEach(function (key) {
    el[key].addEventListener("input", function () {
      state.gradeId = "";
      paintChips();
    });
  });

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

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

  window.bpcSwitchUnit = switchUnit;
  window.bpcReset = resetAll;
  window.bpcCalculate = function () { calculate(true); };

  updateUnitLabels();
  renderSizeChips();
  renderGradeChips();
  applyLubrication();
  refreshAt();
})();


Bolt Preload Calculator

Input parameters

Tags:

Bruce Li

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Input parameters

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Tags:

Bruce Li

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