{
  "category": "Washers",
  "vertical": "fastener-distribution",
  "source": "https://getclaro.ai/resources/attribute-library/fastener-distribution/washers/",
  "status": "editorial-draft",
  "note": "Editorial reference template. Example values show format only and do not describe a real SKU. Not an official ETIM or ECLASS class.",
  "groups": [
    {
      "key": "identity",
      "name": "Identity",
      "check": "Preserve leading zeros and punctuation, validate against the manufacturer record, and check the GTIN check digit and packaging level before linking."
    },
    {
      "key": "technical",
      "name": "Technical specifications",
      "check": "Store the number and unit separately. Convert only when the source unit and test conditions are known."
    },
    {
      "key": "selection",
      "name": "Selection attributes",
      "check": "Map supplier wording to a governed vocabulary only after checking the source text and which variant it applies to."
    },
    {
      "key": "fit",
      "name": "Fit & compatibility",
      "check": "Keep model and series qualifiers. A similar-looking part is not a verified fit until a source says so."
    },
    {
      "key": "evidence",
      "name": "Evidence & compliance",
      "check": "Link the manufacturer document or label with its edition or date. Never copy a certification from a neighboring SKU."
    }
  ],
  "fields": [
    {
      "key": "washer_type",
      "label": "Washer Type",
      "group": "selection",
      "priority": "core",
      "value_type": "controlled",
      "unit": null,
      "example_format": "Flat washer, through-hardened"
    },
    {
      "key": "for_screw_size_nominal",
      "label": "For Screw Size (Nominal)",
      "group": "technical",
      "priority": "core",
      "value_type": "controlled",
      "unit": null,
      "example_format": "1/2 in"
    },
    {
      "key": "inside_diameter",
      "label": "Inside Diameter",
      "group": "technical",
      "priority": "core",
      "value_type": "number",
      "unit": "in",
      "example_format": "0.531 in"
    },
    {
      "key": "outside_diameter",
      "label": "Outside Diameter",
      "group": "technical",
      "priority": "core",
      "value_type": "number",
      "unit": "in",
      "example_format": "1.062 in"
    },
    {
      "key": "thickness",
      "label": "Thickness",
      "group": "technical",
      "priority": "core",
      "value_type": "text",
      "unit": "in",
      "example_format": "0.074-0.121 in"
    },
    {
      "key": "material_grade",
      "label": "Material / Grade",
      "group": "selection",
      "priority": "core",
      "value_type": "controlled",
      "unit": null,
      "example_format": "Medium-carbon steel, through-hardened"
    },
    {
      "key": "finish_coating",
      "label": "Finish / Coating",
      "group": "selection",
      "priority": "core",
      "value_type": "controlled",
      "unit": null,
      "example_format": "Zinc Plated, ASTM B633 SC1 Type III"
    },
    {
      "key": "manufacturer_part_number",
      "label": "Manufacturer Part Number",
      "group": "identity",
      "priority": "core",
      "value_type": "identifier",
      "unit": null,
      "example_format": "FWH-050-SAE-ZY"
    },
    {
      "key": "gtin_upc",
      "label": "GTIN / UPC",
      "group": "identity",
      "priority": "core",
      "value_type": "identifier",
      "unit": null,
      "example_format": "614141234608"
    },
    {
      "key": "package_quantity_uom",
      "label": "Package Quantity / UOM",
      "group": "identity",
      "priority": "core",
      "value_type": "number",
      "unit": "pcs",
      "example_format": "100 per box (sold per box)"
    },
    {
      "key": "dimensional_standard",
      "label": "Dimensional Standard",
      "group": "evidence",
      "priority": "differentiating",
      "value_type": "controlled",
      "unit": null,
      "example_format": "ASME B18.22.1 Type A, Narrow"
    },
    {
      "key": "series_pattern",
      "label": "Series / Pattern",
      "group": "selection",
      "priority": "differentiating",
      "value_type": "controlled",
      "unit": null,
      "example_format": "SAE (Type A Narrow)"
    },
    {
      "key": "hardness_class",
      "label": "Hardness Class",
      "group": "technical",
      "priority": "differentiating",
      "value_type": "text",
      "unit": "HRC",
      "example_format": "38-45 HRC"
    },
    {
      "key": "spring_load_at_flat",
      "label": "Spring Load at Flat",
      "group": "technical",
      "priority": "differentiating",
      "value_type": "number",
      "unit": "lbf",
      "example_format": "1,320 lbf (Belleville washers only; N/A for flat washers)"
    },
    {
      "key": "edge_condition",
      "label": "Edge Condition",
      "group": "selection",
      "priority": "differentiating",
      "value_type": "controlled",
      "unit": null,
      "example_format": "Plain (not chamfered)"
    },
    {
      "key": "country_of_origin",
      "label": "Country of Origin",
      "group": "evidence",
      "priority": "channel",
      "value_type": "controlled",
      "unit": null,
      "example_format": "United States"
    },
    {
      "key": "rohs_reach_status",
      "label": "RoHS / REACH Status",
      "group": "evidence",
      "priority": "channel",
      "value_type": "controlled",
      "unit": null,
      "example_format": "RoHS compliant (trivalent passivate)"
    },
    {
      "key": "certification_available",
      "label": "Certification Available",
      "group": "evidence",
      "priority": "channel",
      "value_type": "controlled",
      "unit": null,
      "example_format": "Certificate of conformance on request"
    }
  ],
  "evidence_columns": [
    "raw_value",
    "normalized_value",
    "source_uri",
    "source_page_or_row",
    "confidence",
    "review_state",
    "last_verified"
  ],
  "normalization_examples": [
    {
      "attribute": "Material / Grade",
      "variants": [
        "18-8",
        "SS304",
        "A2",
        "18/8 Stainless",
        "T304",
        "18-8 SS"
      ],
      "normalized": "Stainless Steel, 18-8 (A2)"
    },
    {
      "attribute": "Finish / Coating",
      "variants": [
        "Zinc Yellow",
        "YZP",
        "Yellow Zinc",
        "Zinc/Yellow Chromate",
        "Yel Zn",
        "Zinc Plated Yellow"
      ],
      "normalized": "Zinc Plated, Yellow (chromate chemistry recorded separately)"
    },
    {
      "attribute": "For Screw Size (Nominal)",
      "variants": [
        "1/2",
        "0.500",
        "1/2 in",
        "1/2\"",
        ".5 inch",
        "1/2 IN"
      ],
      "normalized": "1/2 in"
    }
  ]
}