{
 "hp_mm": 5.08,
 "rack_unit_mm": 44.45,
 "flange_width_mm": 482.6,
 "mounting_hole_centres_mm": 465.1,
 "mounting_hole_pitch_mm": [
  12.7,
  31.75
 ],
 "mounting_hole_span_3u_mm": 57.15,
 "mounting_hole_edge_3u_mm": 37.7,
 "mounting_slot_mm": {
  "depth": 14.7,
  "height": 6.8
 },
 "aperture_3u_mm": {
  "nominal": 132.55,
  "tol": 0.4
 },
 "aperture_84hp_wider_than_hp": 84,
 "provenance": {
  "hp_mm": {
   "id": "EIS-RACK-001",
   "kind": "quoted",
   "source": "IEC 60297-3-101:2004"
  },
  "rack_unit_mm": {
   "id": "EIS-RACK-002",
   "kind": "quoted",
   "source": "IEC 60297-3-101:2004"
  },
  "flange_width_mm": {
   "id": "EIS-RACK-003",
   "kind": "quoted",
   "source": "IEC 60297-3-101:2004, Figure 3; IEC 60297-3-100:2008, Figure 2 (482,6 ± 0,4)"
  },
  "mounting_hole_centres_mm": {
   "kind": "informative",
   "source": "IEC 60297-3-100:2008, clause 6.2 rack mounting grid (beyond the public preview; Schroff standards summary)"
  },
  "mounting_hole_pitch_mm": {
   "kind": "informative",
   "source": "IEC 60297-3-100:2008, clause 6.2 rack mounting grid (beyond the public preview; Schroff standards summary)"
  },
  "mounting_hole_span_3u_mm": {
   "kind": "informative",
   "source": "IEC 60297-3-100:2008, Table 1, H2 (3U: 57,15 ± 0,4)"
  },
  "mounting_hole_edge_3u_mm": {
   "kind": "informative",
   "source": "IEC 60297-3-100:2008, Table 1, H3 (3U: 37,70 ± 0,4)"
  },
  "mounting_slot_mm": {
   "kind": "informative",
   "source": "IEC 60297-3-100:2008, Figure 2 detail A (6,8 +0,5/0 by 14,7 ± 1,2); IEC 60297-3-101:2004, Figure 5 detail X"
  },
  "aperture_3u_mm": {
   "kind": "informative",
   "source": "IEC 60297-3-100:2008, Table 1, H1 (3U: 132,55 ± 0,4; front panels, chassis and subracks)"
  },
  "aperture_84hp_wider_than_hp": {
   "kind": "informative",
   "source": "IEC 60297-3-101:2004, Figure 3 (84 × 5,08)"
  },
  "derived_mounting_hole_inset_mm": {
   "kind": "informative",
   "source": "calculated",
   "value_mm": 8.75
  },
  "derived_flange_each_side_mm": {
   "kind": "informative",
   "source": "calculated"
  },
  "derived_three_rack_units_mm": {
   "kind": "informative",
   "source": "calculated",
   "value_mm": 133.35
  }
 },
 "note": "Quoted or derived figures, bound through EIS-RACK-003. Checked 2026-10-20 against the IEC public preview pages (sources.json: iec-60297-3-100-preview, iec-60297-3-101-preview); the rack grid figures are beyond the preview."
}