36 lines
926 B
JSON
36 lines
926 B
JSON
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{
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"standard": "SAE J429 Grade 8",
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"material": "Alloy Steel (Quenched & Tempered)",
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"properties": {
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"min_tensile_strength_psi": 150000,
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"proof_load_psi": 133000,
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"hardness_rockwell_c": "33-39",
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"elongation_percent_min": 12
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},
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"torque_specs_dry_steel": {
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"target_preload_ratio": 0.75,
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"friction_coefficient_k": 0.2,
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"values_ft_lbs": {
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"1/4-20": 18,
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"5/16-18": 35,
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"3/8-16": 65,
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"1/2-13": 175,
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"5/8-11": 385,
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"3/4-10": 680
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}
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},
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"assembly_protocol": {
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"sequence": "STAR_PATTERN",
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"passes": 3,
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"increments": ["30%", "60%", "100%"],
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"surface_prep": "WIRE_BRUSH_TYPE_II",
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"lubricant": "Ni-CR_ANTI_SEIZE"
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},
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"failure_criteria": {
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"brittle_fracture": "CLEAN_SNAP_THREAD_ROOT",
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"ductile_shear": "NECK_DOWN_BEFORE_BREAK"
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},
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"source": "avery-sherman.4ort.net/manual-grade8.html",
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"timestamp": "2026-07-18T12:00:00Z"
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}
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