{
    "slug": "relief-undercut-chamfer",
    "title": "Normes de gorges de dégagement et de chanfreins : DIN 509, GB/T 3",
    "description": "Formes E/F/G/H des gorges de dégagement DIN 509 avec dimensions et tolérances, gorges de filetage GB/T 3 et DIN 76, et tailles de chanfreins avec les règles de cotation en notation C.",
    "lang": "fr",
    "tables": [
        {
            "caption": "Gorges de dégagement DIN 509 — formes E, F, G et H (mm)",
            "columns": [
                "Forme",
                "r",
                "t1",
                "t2",
                "f",
                "g",
                "Diamètre de pièce d1 (mm)",
                "Sollicitation"
            ],
            "rows": [
                {
                    "Forme": "E",
                    "r": "0.2",
                    "t1": "0.1",
                    "t2": "—",
                    "f": "1",
                    "g": "—",
                    "Diamètre de pièce d1 (mm)": "1.6 to 3",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "E",
                    "r": "0.4",
                    "t1": "0.2",
                    "t2": "—",
                    "f": "2",
                    "g": "—",
                    "Diamètre de pièce d1 (mm)": "3 to 18",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "E",
                    "r": "0.6",
                    "t1": "0.2",
                    "t2": "—",
                    "f": "2",
                    "g": "—",
                    "Diamètre de pièce d1 (mm)": "10 to 18",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "E",
                    "r": "0.6",
                    "t1": "0.3",
                    "t2": "—",
                    "f": "2.5",
                    "g": "—",
                    "Diamètre de pièce d1 (mm)": "18 to 80",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "E",
                    "r": "0.8",
                    "t1": "0.3",
                    "t2": "—",
                    "f": "2.5",
                    "g": "—",
                    "Diamètre de pièce d1 (mm)": "18 to 80",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "E",
                    "r": "1.0",
                    "t1": "0.2",
                    "t2": "—",
                    "f": "2.5",
                    "g": "—",
                    "Diamètre de pièce d1 (mm)": "18 to 50",
                    "Sollicitation": "Alternée élevée"
                },
                {
                    "Forme": "E",
                    "r": "1.0",
                    "t1": "0.4",
                    "t2": "—",
                    "f": "4",
                    "g": "—",
                    "Diamètre de pièce d1 (mm)": "over 80",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "E",
                    "r": "1.2",
                    "t1": "0.2",
                    "t2": "—",
                    "f": "2.5",
                    "g": "—",
                    "Diamètre de pièce d1 (mm)": "18 to 50",
                    "Sollicitation": "Alternée élevée"
                },
                {
                    "Forme": "E",
                    "r": "1.2",
                    "t1": "0.4",
                    "t2": "—",
                    "f": "4",
                    "g": "—",
                    "Diamètre de pièce d1 (mm)": "over 80",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "E",
                    "r": "1.6",
                    "t1": "0.3",
                    "t2": "—",
                    "f": "4",
                    "g": "—",
                    "Diamètre de pièce d1 (mm)": "50 to 80",
                    "Sollicitation": "Alternée élevée"
                },
                {
                    "Forme": "E",
                    "r": "2.5",
                    "t1": "0.4",
                    "t2": "—",
                    "f": "5",
                    "g": "—",
                    "Diamètre de pièce d1 (mm)": "80 to 125",
                    "Sollicitation": "Alternée élevée"
                },
                {
                    "Forme": "E",
                    "r": "4.0",
                    "t1": "0.5",
                    "t2": "—",
                    "f": "7",
                    "g": "—",
                    "Diamètre de pièce d1 (mm)": "over 125",
                    "Sollicitation": "Alternée élevée"
                },
                {
                    "Forme": "F",
                    "r": "0.2",
                    "t1": "0.1",
                    "t2": "0.1",
                    "f": "1",
                    "g": "0.9",
                    "Diamètre de pièce d1 (mm)": "1.6 to 3",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "F",
                    "r": "0.4",
                    "t1": "0.2",
                    "t2": "0.1",
                    "f": "2",
                    "g": "1.1",
                    "Diamètre de pièce d1 (mm)": "3 to 18",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "F",
                    "r": "0.6",
                    "t1": "0.2",
                    "t2": "0.1",
                    "f": "2",
                    "g": "1.4",
                    "Diamètre de pièce d1 (mm)": "10 to 18",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "F",
                    "r": "0.6",
                    "t1": "0.3",
                    "t2": "0.2",
                    "f": "2.5",
                    "g": "2.1",
                    "Diamètre de pièce d1 (mm)": "18 to 80",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "F",
                    "r": "0.8",
                    "t1": "0.3",
                    "t2": "0.2",
                    "f": "2.5",
                    "g": "2.3",
                    "Diamètre de pièce d1 (mm)": "18 to 80",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "F",
                    "r": "1.0",
                    "t1": "0.2",
                    "t2": "0.1",
                    "f": "2.5",
                    "g": "1.8",
                    "Diamètre de pièce d1 (mm)": "18 to 50",
                    "Sollicitation": "Alternée élevée"
                },
                {
                    "Forme": "F",
                    "r": "1.0",
                    "t1": "0.4",
                    "t2": "0.3",
                    "f": "4",
                    "g": "3.2",
                    "Diamètre de pièce d1 (mm)": "over 80",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "F",
                    "r": "1.2",
                    "t1": "0.2",
                    "t2": "0.1",
                    "f": "2.5",
                    "g": "2.0",
                    "Diamètre de pièce d1 (mm)": "18 to 50",
                    "Sollicitation": "Alternée élevée"
                },
                {
                    "Forme": "F",
                    "r": "1.2",
                    "t1": "0.4",
                    "t2": "0.3",
                    "f": "4",
                    "g": "3.4",
                    "Diamètre de pièce d1 (mm)": "over 80",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "F",
                    "r": "1.6",
                    "t1": "0.3",
                    "t2": "0.2",
                    "f": "4",
                    "g": "3.1",
                    "Diamètre de pièce d1 (mm)": "50 to 80",
                    "Sollicitation": "Alternée élevée"
                },
                {
                    "Forme": "F",
                    "r": "2.5",
                    "t1": "0.4",
                    "t2": "0.3",
                    "f": "5",
                    "g": "4.8",
                    "Diamètre de pièce d1 (mm)": "80 to 125",
                    "Sollicitation": "Alternée élevée"
                },
                {
                    "Forme": "F",
                    "r": "4.0",
                    "t1": "0.5",
                    "t2": "0.3",
                    "f": "7",
                    "g": "6.4",
                    "Diamètre de pièce d1 (mm)": "over 125",
                    "Sollicitation": "Alternée élevée"
                },
                {
                    "Forme": "G",
                    "r": "0.4",
                    "t1": "0.2",
                    "t2": "0.2",
                    "f": "0.9",
                    "g": "1.1",
                    "Diamètre de pièce d1 (mm)": "3 to 18",
                    "Sollicitation": "Charges de fatigue faibles seulement"
                },
                {
                    "Forme": "H",
                    "r": "0.8",
                    "t1": "0.3",
                    "t2": "0.05",
                    "f": "2.0",
                    "g": "1.1",
                    "Diamètre de pièce d1 (mm)": "18 to 80",
                    "Sollicitation": "Normale"
                },
                {
                    "Forme": "H",
                    "r": "1.2",
                    "t1": "0.3",
                    "t2": "0.05",
                    "f": "2.4",
                    "g": "1.5",
                    "Diamètre de pièce d1 (mm)": "18 to 50",
                    "Sollicitation": "Normale"
                }
            ]
        },
        {
            "caption": "Gorge de filetage, extérieure — GB/T 3-1997",
            "columns": [
                "Pas P (mm)",
                "g2 max",
                "g1 min",
                "d8",
                "r"
            ],
            "rows": [
                {
                    "Pas P (mm)": "0.5",
                    "g2 max": "1.5",
                    "g1 min": "0.8",
                    "d8": "d − 0.8",
                    "r": "0.2"
                },
                {
                    "Pas P (mm)": "0.7",
                    "g2 max": "2.1",
                    "g1 min": "1.1",
                    "d8": "d − 1.1",
                    "r": "0.4"
                },
                {
                    "Pas P (mm)": "0.8",
                    "g2 max": "2.4",
                    "g1 min": "1.3",
                    "d8": "d − 1.3",
                    "r": "0.4"
                },
                {
                    "Pas P (mm)": "1.0",
                    "g2 max": "3.0",
                    "g1 min": "1.6",
                    "d8": "d − 1.6",
                    "r": "0.6"
                },
                {
                    "Pas P (mm)": "1.25",
                    "g2 max": "3.75",
                    "g1 min": "2.0",
                    "d8": "d − 2.0",
                    "r": "0.6"
                },
                {
                    "Pas P (mm)": "1.5",
                    "g2 max": "4.5",
                    "g1 min": "2.5",
                    "d8": "d − 2.3",
                    "r": "0.8"
                },
                {
                    "Pas P (mm)": "1.75",
                    "g2 max": "5.25",
                    "g1 min": "3.0",
                    "d8": "d − 2.6",
                    "r": "1.0"
                },
                {
                    "Pas P (mm)": "2.0",
                    "g2 max": "6.0",
                    "g1 min": "3.4",
                    "d8": "d − 3.0",
                    "r": "1.0"
                },
                {
                    "Pas P (mm)": "2.5",
                    "g2 max": "7.5",
                    "g1 min": "4.4",
                    "d8": "d − 3.6",
                    "r": "1.2"
                },
                {
                    "Pas P (mm)": "3.0",
                    "g2 max": "9.0",
                    "g1 min": "5.2",
                    "d8": "d − 4.4",
                    "r": "1.6"
                }
            ]
        },
        {
            "caption": "Gorge de filetage, intérieure — GB/T 3-1997",
            "columns": [
                "Pas P (mm)",
                "G1 normale",
                "G1 courte",
                "D5",
                "R"
            ],
            "rows": [
                {
                    "Pas P (mm)": "0.5",
                    "G1 normale": "2",
                    "G1 courte": "1",
                    "D5": "D + 0.3",
                    "R": "0.2"
                },
                {
                    "Pas P (mm)": "0.7",
                    "G1 normale": "2.8",
                    "G1 courte": "1.4",
                    "D5": "D + 0.4",
                    "R": "0.4"
                },
                {
                    "Pas P (mm)": "0.8",
                    "G1 normale": "3.2",
                    "G1 courte": "1.6",
                    "D5": "D + 0.4",
                    "R": "0.4"
                },
                {
                    "Pas P (mm)": "1.0",
                    "G1 normale": "4",
                    "G1 courte": "2",
                    "D5": "D + 0.5",
                    "R": "0.5"
                },
                {
                    "Pas P (mm)": "1.25",
                    "G1 normale": "5",
                    "G1 courte": "2.5",
                    "D5": "D + 0.6",
                    "R": "0.6"
                },
                {
                    "Pas P (mm)": "1.5",
                    "G1 normale": "6",
                    "G1 courte": "3",
                    "D5": "D + 0.8",
                    "R": "0.8"
                },
                {
                    "Pas P (mm)": "1.75",
                    "G1 normale": "7",
                    "G1 courte": "3.5",
                    "D5": "D + 0.9",
                    "R": "0.9"
                },
                {
                    "Pas P (mm)": "2.0",
                    "G1 normale": "8",
                    "G1 courte": "4",
                    "D5": "D + 1.0",
                    "R": "1.0"
                },
                {
                    "Pas P (mm)": "2.5",
                    "G1 normale": "10",
                    "G1 courte": "5",
                    "D5": "D + 1.2",
                    "R": "1.2"
                },
                {
                    "Pas P (mm)": "3.0",
                    "G1 normale": "12",
                    "G1 courte": "6",
                    "D5": "D + 1.5",
                    "R": "1.5"
                }
            ]
        },
        {
            "caption": "Gorge de filetage — DIN 76-1 (plans européens)",
            "columns": [
                "Filetage",
                "P",
                "dg extérieur (h13)",
                "r",
                "dG intérieur (H13)",
                "g, forme A",
                "g, forme B",
                "g, forme C",
                "g, forme D"
            ],
            "rows": [
                {
                    "Filetage": "M3",
                    "P": "0.5",
                    "dg extérieur (h13)": "2.2",
                    "r": "0.2",
                    "dG intérieur (H13)": "3.3",
                    "g, forme A": "1.75",
                    "g, forme B": "1.25",
                    "g, forme C": "2.7",
                    "g, forme D": "2.0"
                },
                {
                    "Filetage": "M4",
                    "P": "0.7",
                    "dg extérieur (h13)": "2.9",
                    "r": "0.4",
                    "dG intérieur (H13)": "4.3",
                    "g, forme A": "2.45",
                    "g, forme B": "1.75",
                    "g, forme C": "3.8",
                    "g, forme D": "2.75"
                },
                {
                    "Filetage": "M5",
                    "P": "0.8",
                    "dg extérieur (h13)": "3.7",
                    "r": "0.4",
                    "dG intérieur (H13)": "5.3",
                    "g, forme A": "2.8",
                    "g, forme B": "2.0",
                    "g, forme C": "4.2",
                    "g, forme D": "3.0"
                },
                {
                    "Filetage": "M6",
                    "P": "1.0",
                    "dg extérieur (h13)": "4.4",
                    "r": "0.6",
                    "dG intérieur (H13)": "6.5",
                    "g, forme A": "3.5",
                    "g, forme B": "2.5",
                    "g, forme C": "5.2",
                    "g, forme D": "3.7"
                },
                {
                    "Filetage": "M8",
                    "P": "1.25",
                    "dg extérieur (h13)": "6.0",
                    "r": "0.6",
                    "dG intérieur (H13)": "8.5",
                    "g, forme A": "4.4",
                    "g, forme B": "3.2",
                    "g, forme C": "6.7",
                    "g, forme D": "4.9"
                },
                {
                    "Filetage": "M10",
                    "P": "1.5",
                    "dg extérieur (h13)": "7.7",
                    "r": "0.8",
                    "dG intérieur (H13)": "10.5",
                    "g, forme A": "5.2",
                    "g, forme B": "3.8",
                    "g, forme C": "7.8",
                    "g, forme D": "5.6"
                },
                {
                    "Filetage": "M12",
                    "P": "1.75",
                    "dg extérieur (h13)": "9.4",
                    "r": "1.0",
                    "dG intérieur (H13)": "12.5",
                    "g, forme A": "6.1",
                    "g, forme B": "4.3",
                    "g, forme C": "9.1",
                    "g, forme D": "6.1"
                },
                {
                    "Filetage": "M14",
                    "P": "2.0",
                    "dg extérieur (h13)": "11.0",
                    "r": "1.0",
                    "dG intérieur (H13)": "14.5",
                    "g, forme A": "7.0",
                    "g, forme B": "5.0",
                    "g, forme C": "10.3",
                    "g, forme D": "7.3"
                },
                {
                    "Filetage": "M16",
                    "P": "2.0",
                    "dg extérieur (h13)": "14.4",
                    "r": "1.2",
                    "dG intérieur (H13)": "18.5",
                    "g, forme A": "8.7",
                    "g, forme B": "6.3",
                    "g, forme C": "13.0",
                    "g, forme D": "9.3"
                }
            ]
        },
        {
            "caption": "Tailles de chanfreins et indication sur plan",
            "columns": [
                "Scénario",
                "Chanfreins courants",
                "Indication sur plan",
                "Convention de tolérance"
            ],
            "rows": [
                {
                    "Scénario": "Diamètre extérieur",
                    "Chanfreins courants": "C0.5, C1, C1.5, C2",
                    "Indication sur plan": "45° écrit C1 ou 1×45° ; les chanfreins autres que 45° montrent angle et longueur séparément.",
                    "Convention de tolérance": "ISO 2768-m broken edges: 0.5–3 ±0.2; 3–6 ±0.5; over 6 ±1.0"
                },
                {
                    "Scénario": "Alésage intérieur",
                    "Chanfreins courants": "C0.5, C1, C2",
                    "Indication sur plan": "Sur l'arête d'entrée ; les mêmes règles C s'appliquent qu'à l'extérieur.",
                    "Convention de tolérance": "ISO 2768-1 broken-edge rows, same as external"
                },
                {
                    "Scénario": "Face de bout",
                    "Chanfreins courants": "C1, C2, C3",
                    "Indication sur plan": "Notation C à côtés égaux uniquement à 45°.",
                    "Convention de tolérance": "Per the ISO 2768 class stated in the title block"
                },
                {
                    "Scénario": "Bout de filet, extérieur",
                    "Chanfreins courants": "See the thread chamfer table below",
                    "Indication sur plan": "45° typique, 30°/60° admis ; profondeur au moins la hauteur du profil de filet.",
                    "Convention de tolérance": "Transition angle α ≥ 30° (GB/T 3-1997 clause 2.3)"
                },
                {
                    "Scénario": "Entrée de filet, intérieur",
                    "Chanfreins courants": "See the thread chamfer table below",
                    "Indication sur plan": "Angle intérieur de 120° typique, 90° admis ; diamètre (1.0–1.05) × D.",
                    "Convention de tolérance": "Countersink, not a linear C dimension (GB/T 3-1997 clause 3.3)"
                }
            ]
        },
        {
            "caption": "Chanfreins de bout de filet M3–M24",
            "columns": [
                "Filetage",
                "P",
                "Angle extérieur",
                "Ø pointe, dérivé (d − 1.08P)",
                "Règle d'atelier (d − P)",
                "Cône d'entrée intérieur",
                "Ø intérieur",
                "Objet"
            ],
            "rows": [
                {
                    "Filetage": "M3",
                    "P": "0.5",
                    "Angle extérieur": "45°",
                    "Ø pointe, dérivé (d − 1.08P)": "2.46 ≈ 2.5",
                    "Règle d'atelier (d − P)": "2.5",
                    "Cône d'entrée intérieur": "120°",
                    "Ø intérieur": "3.0–3.15",
                    "Objet": "Guide la filière ou le taraud ; protège le premier filet."
                },
                {
                    "Filetage": "M4",
                    "P": "0.7",
                    "Angle extérieur": "45°",
                    "Ø pointe, dérivé (d − 1.08P)": "3.24 ≈ 3.2",
                    "Règle d'atelier (d − P)": "3.3",
                    "Cône d'entrée intérieur": "120°",
                    "Ø intérieur": "4.0–4.2",
                    "Objet": "Facilite le début d'assemblage."
                },
                {
                    "Filetage": "M5",
                    "P": "0.8",
                    "Angle extérieur": "45°",
                    "Ø pointe, dérivé (d − 1.08P)": "4.14 ≈ 4.1",
                    "Règle d'atelier (d − P)": "4.2",
                    "Cône d'entrée intérieur": "120°",
                    "Ø intérieur": "5.0–5.25",
                    "Objet": "Supprime la bavure de la première crête."
                },
                {
                    "Filetage": "M6",
                    "P": "1.0",
                    "Angle extérieur": "45°",
                    "Ø pointe, dérivé (d − 1.08P)": "4.92 ≈ 4.9",
                    "Règle d'atelier (d − P)": "5.0",
                    "Cône d'entrée intérieur": "120°",
                    "Ø intérieur": "6.0–6.3",
                    "Objet": "Guide l'engagement écrou-boulon."
                },
                {
                    "Filetage": "M8",
                    "P": "1.25",
                    "Angle extérieur": "45°",
                    "Ø pointe, dérivé (d − 1.08P)": "6.65 ≈ 6.6",
                    "Règle d'atelier (d − P)": "6.75",
                    "Cône d'entrée intérieur": "120°",
                    "Ø intérieur": "8.0–8.4",
                    "Objet": "Protège les premiers tours porteurs."
                },
                {
                    "Filetage": "M10",
                    "P": "1.5",
                    "Angle extérieur": "45°",
                    "Ø pointe, dérivé (d − 1.08P)": "8.38 ≈ 8.4",
                    "Règle d'atelier (d − P)": "8.5",
                    "Cône d'entrée intérieur": "120°",
                    "Ø intérieur": "10.0–10.5",
                    "Objet": "Évite le faux filetage."
                },
                {
                    "Filetage": "M12",
                    "P": "1.75",
                    "Angle extérieur": "45°",
                    "Ø pointe, dérivé (d − 1.08P)": "10.11 ≈ 10.1",
                    "Règle d'atelier (d − P)": "10.25",
                    "Cône d'entrée intérieur": "120°",
                    "Ø intérieur": "12.0–12.6",
                    "Objet": "Guide d'assemblage."
                },
                {
                    "Filetage": "M14",
                    "P": "2.0",
                    "Angle extérieur": "45°",
                    "Ø pointe, dérivé (d − 1.08P)": "11.84 ≈ 11.8",
                    "Règle d'atelier (d − P)": "12.0",
                    "Cône d'entrée intérieur": "120°",
                    "Ø intérieur": "14.0–14.7",
                    "Objet": "Protège le premier filet complet."
                },
                {
                    "Filetage": "M16",
                    "P": "2.0",
                    "Angle extérieur": "45°",
                    "Ø pointe, dérivé (d − 1.08P)": "13.84 ≈ 13.8",
                    "Règle d'atelier (d − P)": "14.0",
                    "Cône d'entrée intérieur": "120°",
                    "Ø intérieur": "16.0–16.8",
                    "Objet": "Entrée de filière et maîtrise des bavures."
                },
                {
                    "Filetage": "M18",
                    "P": "2.5",
                    "Angle extérieur": "45°",
                    "Ø pointe, dérivé (d − 1.08P)": "15.30",
                    "Règle d'atelier (d − P)": "15.5",
                    "Cône d'entrée intérieur": "120°",
                    "Ø intérieur": "18.0–18.9",
                    "Objet": "Protection du départ du filet."
                },
                {
                    "Filetage": "M20",
                    "P": "2.5",
                    "Angle extérieur": "45°",
                    "Ø pointe, dérivé (d − 1.08P)": "17.30",
                    "Règle d'atelier (d − P)": "17.5",
                    "Cône d'entrée intérieur": "120°",
                    "Ø intérieur": "20.0–21.0",
                    "Objet": "Évite le grippage au départ."
                },
                {
                    "Filetage": "M22",
                    "P": "2.5",
                    "Angle extérieur": "45°",
                    "Ø pointe, dérivé (d − 1.08P)": "19.30",
                    "Règle d'atelier (d − P)": "19.5",
                    "Cône d'entrée intérieur": "120°",
                    "Ø intérieur": "22.0–23.1",
                    "Objet": "Guide d'assemblage."
                },
                {
                    "Filetage": "M24",
                    "P": "3.0",
                    "Angle extérieur": "45°",
                    "Ø pointe, dérivé (d − 1.08P)": "20.76 ≈ 20.8",
                    "Règle d'atelier (d − P)": "21.0",
                    "Cône d'entrée intérieur": "120°",
                    "Ø intérieur": "24.0–25.2",
                    "Objet": "Protège les premiers tours porteurs."
                }
            ]
        }
    ]
}