Bolt Tensile Strength Check Calculator

The Bolt Tensile Strength Check Calculator is a professional engineering tool designed to evaluate the tensile strength and load-bearing capacity of bolts under different working conditions. By analyzing key parameters such as bolt diameter, material strength, applied tensile load, and safety factor, it helps engineers verify whether a bolt can safely withstand the required force. The Bolt Tensile Strength Check Calculator supports fastener selection, mechanical design, and structural safety evaluation while reducing the risks of bolt fracture, excessive stress, and connection failure.

Bolt Tensile Strength Check Calculator | Bolt Load Capacity & Safety Factor

Input parameters

1 Bolt geometry

Bolt diameter ?Nominal major diameter d. For metric bolts this is the M-size (12 mm for M12). For UN bolts enter the nominal inch size. Used to estimate tensile stress area At.

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. Required to auto-calculate tensile stress area.

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. Stress is σ = F / At.

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

Bolt material grade ?ISO 898-1 property classes use nominal Sut = class × 100 MPa and Sy = second digit × Sut / 10. Stainless uses A2-70 (700 / 450 MPa). Choose Custom Material to type catalog values.

Ultimate tensile strength S_ut ?Minimum ultimate tensile strength of the bolt. Grade 10.9 nominal Sut is 1000 MPa. Maximum tensile capacity Ft = At × Sut.

MPa

Yield strength S_y ?Minimum yield or 0.2% proof stress. Grade 10.9 nominal Sy is 900 MPa. Allowable stress Sa = Sy / design safety factor.

MPa

3 Applied tensile load

Applied tensile load ?External pulling force on the joint. For multiple bolts this is the total load; the calculator splits it equally as F / n. Do not enter a negative or zero value.

Number of bolts ?Bolts assumed to share the tensile load equally. Load per bolt = total load / n. Eccentric patterns and prying can increase the peak bolt load.

Design safety factor ?Divides yield strength to obtain allowable tensile stress Sa = Sy / n. Default 2.0 is a common static-design starting point. Critical or fatigue joints often need a higher factor from the governing standard.

Allowable tensile stress S_a = S_y / n. This Bolt Safety Factor Calculator then reports Safety Factor = allowable load / applied load per bolt.

Calculated results

Bolt tensile stress

—

σ = F / A_t

Safety factor

—

Allowable load / applied load

Safety factor gauge

—

Fa / F per bolt (scale 0–4)

Load utilization percentage —

≤ 85% allowable 85–100% warning > 100% failure risk

Strength comparison chart

Applied stress σ

—

Allowable S_a

—

Yield S_y

—

Ultimate S_ut

—

Maximum tensile capacity

—

F_t = A_t × S_ut

Allowable tensile load

—

F_a = A_t × S_a

Load per bolt

—

F / n

Tensile stress area

—

from d and pitch

Allowable stress S_a

—

S_y / design n

Yield strength

—

material S_y

Ultimate strength

—

material S_ut

SF vs yield

—

S_y / σ

SF vs ultimate

—

S_ut / σ

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  if (!root || root.getAttribute("data-bts-ready") === "1") return;
  root.setAttribute("data-bts-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 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 }
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  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 = {
    "4.6":  { sut: 400, sy: 240, label: "Grade 4.6" },
    "5.8":  { sut: 500, sy: 400, label: "Grade 5.8" },
    "8.8":  { sut: 800, sy: 640, label: "Grade 8.8" },
    "10.9": { sut: 1000, sy: 900, label: "Grade 10.9" },
    "12.9": { sut: 1200, sy: 1080, label: "Grade 12.9" },
    ss:     { sut: 700, sy: 450, label: "Stainless steel A2-70" },
    custom: null
  };

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    unit: "metric",
    d: 12,
    p: 1.75,
    atManual: false,
    grade: "10.9",
    sut: 1000,
    sy: 900,
    F: 30000,
    fUnit: "N",
    nsf: 2,
    nbolts: 1,
    size: "M12"
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    barSaVal: byId("btsBarSaVal"),
    barSyVal: byId("btsBarSyVal"),
    barSutVal: byId("btsBarSutVal")
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    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"; });
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        el.p.value = String(state.unit === "metric" ? s.p : s.tpi);
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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);
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  function applyGrade() {
    var g = GRADES[el.grade.value];
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    var metric = state.unit === "metric";
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    el.sy.readOnly = false;
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  function forceToN() {
    var v = num(el.F);
    if (!isFinite(v)) return NaN;
    var u = el.fUnit.value;
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    if (u === "lbf") return v / LBF_PER_N;
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  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;
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    if (toU === "lbf") return n * LBF_PER_N;
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  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  /  " + fmt(N, 0) + " N" };
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  function formatStress(MPa) {
    if (!isFinite(MPa)) return { primary: "-", secondary: "" };
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  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";
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  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 sy = num(el.sy);
    var F = num(el.F);
    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(sy)) el.sy.value = roundSmart(sy * 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(sy)) el.sy.value = roundSmart(sy / PSI_PER_MPA);
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    el.fUnit.value = toFU;
    lastFUnit = toFU;
    if (isFinite(F)) el.F.value = roundSmart(convertForceUnitValue(F, fromFU, 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 sy = num(el.sy);
    return {
      d: d,
      p: p,
      at: at,
      sut: sut,
      sy: sy,
      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,
      sy_MPa: metric ? sy : sy / PSI_PER_MPA,
      F_N: forceToN(),
      nsf: num(el.nsf),
      nbolts: num(el.nbolts)
    };
  }

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

  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; }
    else if (si.d_mm < 1.5 || si.d_mm > 150) { setErr("D", "Diameter looks unrealistic. Typical range is about 2 mm to 150 mm."); 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", state.unit === "metric" ? "Pitch must be greater than zero." : "TPI must be greater than zero.");
      ok = false;
    } else if (state.unit === "metric" && si.d > 0 && si.p >= si.d) {
      setErr("P", "Pitch must be smaller than the bolt diameter.");
      ok = false;
    } else 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; tensile stress area would be 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.F) || !isFinite(num(el.F))) { setErr("F", "Enter the applied tensile load."); ok = false; }
    else if (!(si.F_N > 0)) { setErr("F", "Applied tensile load must be greater than zero."); 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; }
    else if (si.sut_MPa < 200 || si.sut_MPa > 2500) {
      setErr("Sut", "Value looks unrealistic for a steel bolt (typical 250–2200 MPa / 36–320 ksi).");
      ok = false;
    }

    if (empty(el.sy) || !isFinite(num(el.sy))) { setErr("Sy", "Enter yield strength."); ok = false; }
    else if (!(si.sy > 0)) { setErr("Sy", "Yield strength must be greater than zero."); ok = false; }
    else if (si.sy_MPa < 80 || si.sy_MPa > 2200) {
      setErr("Sy", "Yield strength looks unrealistic for a steel bolt.");
      ok = false;
    } else if (isFinite(si.sut_MPa) && si.sy_MPa > si.sut_MPa) {
      setErr("Sy", "Yield strength cannot exceed ultimate tensile strength.");
      ok = false;
    }

    if (empty(el.nsf) || !isFinite(num(el.nsf))) { setErr("Nsf", "Enter a design safety factor."); ok = false; }
    else if (!(si.nsf > 0)) { setErr("Nsf", "Design safety factor must be greater than zero."); ok = false; }
    else if (si.nsf < 1 || si.nsf > 12) { setErr("Nsf", "Enter a design safety factor between 1 and 12."); ok = false; }

    if (empty(el.nbolts) || !isFinite(num(el.nbolts))) { setErr("Nbolts", "Enter the number of bolts."); ok = false; }
    else if (!(si.nbolts >= 1) || Math.floor(si.nbolts) !== si.nbolts) {
      setErr("Nbolts", "Number of bolts must be an integer \u2265 1.");
      ok = false;
    }

    return ok;
  }

  function setGauge(sf) {
    var frac = clamp((isFinite(sf) ? sf : 0) / 4, 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) {
    if (!el.schematic) return;
    el.schematic.setAttribute("data-status", status || "idle");
  }

  function setBar(node, pct) {
    if (!node) return;
    node.style.width = clamp(pct, 0, 100) + "%";
  }

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

    if (!ok) {
      state.live = false;
      el.statusTitle.textContent = "Check inputs";
      el.statusNote.textContent = "Correct the highlighted fields, then calculate again. Empty, zero, or negative values are not allowed.";
      el.banner.className = "bts-banner bts-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 nBolts = si.nbolts;
    var Ftotal = si.F_N;
    var Fb = Ftotal / nBolts;
    var sigma = Fb / At;
    var Sut = si.sut_MPa;
    var Sy = si.sy_MPa;
    var nsf = si.nsf;
    var Sa = Sy / nsf;
    var Ft = At * Sut;
    var Fa = At * Sa;
    var Fy = At * Sy;
    var sfAllow = Fa / Fb;
    var sfYield = Sy / sigma;
    var sfUlt = Sut / sigma;
    var util = (Fb / Fa) * 100;

    var alerts = [];
    var status = "safe";
    var title = "Safe";
    var note = "Tensile stress is within the allowable range for the selected design safety factor.";

    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 tensile stress area differs by more than 15% from the pitch formula. Confirm the catalog At value used in this Bolt Stress Calculator." });
      }
    }
    if (Sy / Sut > 0.95) {
      alerts.push({ type: "warn", text: "Yield is more than 95% of ultimate tensile strength. High-strength bolts have limited ductility; check the material certificate." });
    } else if (Sy / Sut < 0.45) {
      alerts.push({ type: "warn", text: "Yield is unusually low compared with ultimate strength. Confirm the grade and units." });
    }
    if (nBolts > 1) {
      alerts.push({ type: "ok", text: "Load per bolt = total load / " + nBolts + " (equal share). Pattern geometry and prying can overload the most highly loaded fastener." });
    }
    if (sigma >= Sy) {
      alerts.push({ type: "risk", text: "Bolt tensile stress exceeds yield strength. Permanent elongation or fracture is likely." });
    } else if (sigma >= 0.90 * Sy) {
      alerts.push({ type: "warn", text: "Bolt tensile stress approaches yield (" + fmt(sigma / Sy * 100, 1) + "% of Sy). Reduce load or use a larger / higher-grade bolt." });
    }
    if (sigma >= Sut) {
      alerts.push({ type: "risk", text: "Bolt tensile stress meets or exceeds ultimate tensile strength. Fracture risk is high." });
    }

    if (util > 100 || sigma >= Sy || Fb >= Fa) {
      status = "risk";
      title = "Failure Risk";
      note = "Applied tensile load exceeds the allowable tensile capacity. Increase bolt size or grade, add fasteners, or reduce the load before using this connection.";
      alerts.unshift({ type: "risk", text: "Applied load per bolt " + formatForce(Fb).primary + " exceeds allowable tensile load " + formatForce(Fa).primary + "." });
    } else if (util >= 85 || sigma >= 0.90 * Sy || sfAllow < 1.15) {
      status = "caution";
      title = "Warning";
      note = "Stress approaches the allowable design limit. Confirm installation, thread condition, and applicable standards before accepting this result from the Bolt Tensile Strength Calculator.";
      alerts.unshift({ type: "warn", text: "Load utilization is " + fmt(util, 1) + "% of allowable capacity. Remaining margin is small." });
    } else {
      status = "safe";
      title = "Safe";
      note = "Tensile stress is within the allowable range. Safety factor versus allowable load is " + fmt(sfAllow, 2) + ".";
      alerts.unshift({ type: "ok", text: "Bolt strength status is Safe. Actual safety factor vs yield is " + fmt(sfYield, 2) + " (Sy / \u03c3)." });
    }

    var sFmt = formatStress(sigma);
    var ftFmt = formatForce(Ft);
    var faFmt = formatForce(Fa);
    var fbFmt = formatForce(Fb);

    el.outStress.textContent = sFmt.primary;
    el.outStressSub.textContent = (sFmt.secondary ? sFmt.secondary + "  \u2014  " : "") + "\u03c3 = F / At";
    el.outFt.textContent = ftFmt.primary;
    el.outFtSub.textContent = ftFmt.secondary || "Ft = At \u00d7 Sut";
    el.outFa.textContent = faFmt.primary;
    el.outFaSub.textContent = faFmt.secondary || "Fa = At \u00d7 Sa";
    el.outSf.textContent = fmt(sfAllow, 2);
    el.outSfSub.textContent = "Allowable load / applied load per bolt";

    el.outUtil.textContent = fmt(util, 1) + "% of allowable";
    el.utilFill.style.width = clamp(util, 0, 100) + "%";
    el.utilFill.className = "bts-util-fill" + (status === "risk" ? " bts-is-risk" : status === "caution" ? " bts-is-caution" : " bts-is-ok");

    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.outFb.textContent = fbFmt.primary;
    el.outFbNote.textContent = nBolts > 1 ? "total " + formatForce(Ftotal).primary + " / " + nBolts : "single bolt";
    el.outSa.textContent = formatStress(Sa).primary;
    el.outSy.textContent = formatStress(Sy).primary;
    el.outSut.textContent = formatStress(Sut).primary;
    el.outNyield.textContent = fmt(sfYield, 2);
    el.outNult.textContent = fmt(sfUlt, 2);

    if (el.gaugeRead) el.gaugeRead.textContent = fmt(sfAllow, 2);
    if (el.gaugeNote) el.gaugeNote.textContent = "vs design allowable (n = " + fmt(nsf, 2) + ")";
    setGauge(sfAllow);

    if (el.schForce) el.schForce.textContent = fbFmt.primary;
    setSchematic(status === "risk" ? "risk" : status === "caution" ? "caution" : "ok");

    var scale = Math.max(Sut, Sy, Sa, sigma, 1);
    setBar(el.barSigma, sigma / scale * 100);
    setBar(el.barSa, Sa / scale * 100);
    setBar(el.barSy, Sy / scale * 100);
    setBar(el.barSut, Sut / scale * 100);
    if (el.barSigmaVal) el.barSigmaVal.textContent = sFmt.primary;
    if (el.barSaVal) el.barSaVal.textContent = formatStress(Sa).primary;
    if (el.barSyVal) el.barSyVal.textContent = formatStress(Sy).primary;
    if (el.barSutVal) el.barSutVal.textContent = formatStress(Sut).primary;
    if (el.barSigma) {
      el.barSigma.className = "bts-bar-fill" + (status === "risk" ? " bts-is-risk" : status === "caution" ? " bts-is-caution" : " bts-is-ok");
    }

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

    el.alerts.innerHTML = "";
    alerts.forEach(function (a) {
      var div = document.createElement("div");
      div.className = "bts-alert bts-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(".bts-card").scrollIntoView({ behavior: "smooth", block: "nearest" }); } catch (e) {}
    }
  }

  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.nsf.value = String(DEFAULTS.nsf);
    el.nbolts.value = String(DEFAULTS.nbolts);
    el.fUnit.value = DEFAULTS.fUnit;
    lastFUnit = DEFAULTS.fUnit;
    el.F.value = String(DEFAULTS.F);
    applyGrade();
    updateUnitLabels();
    renderSizeChips();
    refreshAt();
    clearErrs();
    el.results.classList.add("bts-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 === "btsBtnMetric") {
      e.preventDefault();
      switchUnit("metric");
    } else if (btn.id === "btsBtnImperial") {
      e.preventDefault();
      switchUnit("imperial");
    } else if (btn.id === "btsBtnReset") {
      e.preventDefault();
      resetAll();
    } else if (btn.id === "btsBtnCalculate") {
      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.sy.readOnly = false;
    } else {
      applyGrade();
    }
    if (state.live) calculate(false);
  });

  ["sut", "sy"].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", "F", "nsf", "nbolts"].forEach(function (key) {
    el[key].addEventListener("input", function () {
      if (state.live) calculate(false);
    });
  });

  el.fUnit.addEventListener("change", function () {
    var next = el.fUnit.value;
    if (next === lastFUnit) return;
    var F = num(el.F);
    el.fUnit.value = lastFUnit;
    if (isFinite(F)) el.F.value = roundSmart(convertForceUnitValue(F, lastFUnit, next));
    el.fUnit.value = 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.btsSwitchUnit = switchUnit;
  window.btsReset = resetAll;
  window.btsCalculate = function () { calculate(true); };

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


Bolt Tensile Strength Check Calculator

Input parameters

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Bruce Li

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Input parameters

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Tags:

Bruce Li

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