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