185 lines
5.1 KiB
HTML
185 lines
5.1 KiB
HTML
<!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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</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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