185 lines
5.1 KiB
HTML
185 lines
5.1 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Field Manual: SAE J429 Grade 8</title>
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<link rel="stylesheet" href="/styles.css">
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<style>
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:root {
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--bg: #1a1a1a;
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--fg: #e0e0e0;
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--accent: #ff4500;
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body {
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background-color: var(--bg);
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color: var(--fg);
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font-family: var(--mono);
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margin: 0;
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padding: 2rem;
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line-height: 1.4;
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max-width: 800px;
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border-left: 1px solid var(--border);
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border-right: 1px solid var(--border);
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min-height: 100vh;
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}
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h1, h2, h3 {
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text-transform: uppercase;
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letter-spacing: 0.05em;
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border-bottom: 2px solid var(--accent);
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padding-bottom: 0.5rem;
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margin-top: 2rem;
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color: var(--accent);
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text-decoration-thickness: 2px;
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display: grid;
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grid-template-columns: repeat(2, 1fr);
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border: 1px solid var(--border);
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padding: 1rem;
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.spec-item {
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border: 1px solid var(--border);
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padding: 1rem;
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color: var(--accent);
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font-weight: bold;
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margin-bottom: 0.5rem;
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.spec-value {
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font-size: 1.2rem;
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}
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margin: 1.5rem 0;
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}
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.media-container {
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width: 100%;
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height: 300px;
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background-color: #000;
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border: 1px solid var(--accent);
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display: flex;
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align-items: center;
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justify-content: center;
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margin: 2rem 0;
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overflow: hidden;
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}
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.media-container img {
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width: 100%;
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height: 100%;
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object-fit: cover;
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filter: grayscale(100%) contrast(120%);
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}
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.back-link {
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display: inline-block;
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margin-bottom: 2rem;
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color: var(--accent);
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font-weight: bold;
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}
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</style>
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<script defer src="https://analytics.4ort.xyz/script.js" data-website-id="d3ed927c-888a-4a6c-ae5f-0b1c613ddf5b"></script>
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</head>
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<body>
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<a href="/" class="back-link">← RETURN TO HQ</a>
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<h1>FIELD MANUAL: SAE J429 GRADE 8</h1>
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<p><strong>CLASSIFICATION:</strong> HIGH-STRENGTH BOLTING // QUARTER-TURN MARK</p>
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<p><strong>JURISDICTION:</strong> STRUCTURAL TRUSS ASSEMBLIES, HEAT-SINK MOUNTS, PRESSURE VESSELS</p>
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<section class="procedure-step">
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<h3>PHASE 1: MATERIAL VERIFICATION</h3>
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<p>Before assembly, verify the six radial dashes on the bolt head indicating Grade 8 alloy. Any deviation indicates lower-grade substitution. Rejection criteria: missing marks, cracked heads, or corrosion exceeding 0.05mm.</p>
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</section>
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<section>
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<h2>MECHANICAL PROPERTIES</h2>
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<p>Values derived from ASTM F3125 and SAE J429 standards. These are non-negotiable boundaries.</p>
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<div class="spec-grid">
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<div class="spec-item">
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<span class="spec-label">MINIMUM TENSILE STRENGTH</span>
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<span class="spec-value">150,000 PSI</span>
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</div>
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<div class="spec-item">
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<span class="spec-label">PROOF LOAD (YIELD)</span>
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<span class="spec-value">133,000 PSI</span>
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</div>
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<div class="spec-item">
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<span class="spec-label">HARDNESS (ROCKWELL)</span>
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<span class="spec-value">HRC 33-39</span>
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</div>
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<div class="spec-item">
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<span class="spec-label">ELONGATION AT BREAK</span>
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<span class="spec-value">≥ 12%</span>
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</div>
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</div>
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</section>
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<section>
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<h2>TORQUE PROTOCOL</h2>
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<p>Target Preload: 75% of Proof Load.<br>
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Friction Coefficient (Dry Steel): μ = 0.2<br>
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Formula: <code>T = K × D × F</code></p>
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<div class="spec-grid">
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<div class="spec-item">
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<span class="spec-label">1/4"-20</span>
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<span class="spec-value">18 ft-lbs</span>
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</div>
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<div class="spec-item">
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<span class="spec-label">5/16"-18</span>
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<span class="spec-value">35 ft-lbs</span>
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</div>
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<div class="spec-item">
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<span class="spec-label">3/8"-16</span>
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<span class="spec-value">65 ft-lbs</span>
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</div>
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<div class="spec-item">
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<span class="spec-label">1/2"-13</span>
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<span class="spec-value">175 ft-lbs</span>
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</div>
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</div>
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</section>
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<section class="procedure-step">
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<h3>PHASE 2: SURFACE PREPARATION</h3>
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<p>1. Remove all burrs from threads using a wire brush (Type II).<br>
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2. Apply anti-seize compound (Nickel-chromium based) to threads only. Excess on bearing surface increases friction error by >15%.<br>
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3. Verify washer seating surface is perpendicular to bolt axis within 0.5 degrees.</p>
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</section>
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<section>
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<h2>EVIDENCE OF COMPLIANCE</h2>
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<div class="media-container">
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<img src="https://images.unsplash.com/photo-1581091226825-a662db180e13?q=80&w=1200&auto=format&fit=crop" alt="Close-up of hex-bolt head showing six radial grade markings">
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</div>
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<p><small>FIG 1.0: SIX-RADIAL DASH IDENTIFIER. PHOTO COURTESY UNSPLASH.</small></p>
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</section>
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<section>
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<h2>FAILURE MODES</h2>
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<ul>
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<li><strong>THREAD STRIPPING:</strong> Occurs when torque exceeds 110% of spec. Prevention: Use torque-limiting driver.</li>
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<li><strong>DUCTILE SHEAR:</strong> Bolt necks down before breaking. Indicates correct material properties.</li>
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<li><strong>BRITTLE FRACTURE:</strong> Clean snap at thread root. Indicates hydrogen embrittlement or improper heat treatment.</li>
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</ul>
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</section>
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<footer style="margin-top: 3rem; border-top: 1px dashed #444; padding-top: 1rem;">
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<p><a href="/ledger.html">NEXT: THERMAL MISMATCH LEDGER</a> // <a href="/">HOME</a></p>
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</footer>
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</body>
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</html>
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