NF EN ISO 16047
Fasteners - Torque/clamp force testing
ISO 16047:2005 specifies the conditions for carrying out torque/clamp force tests on threaded fasteners and related parts. It is applicable, basically, to bolts, screws, studs and nuts made of carbon steel and alloy steel, whose mechanical properties are specified in ISO 898-1, ISO 898-2 or ISO 898-6, having ISO metric threads with thread sizes M3 to M39. It is also applicable to the combination of other externally and internally threaded fasteners with a triangular ISO thread according to ISO 68. It is not applicable to set screws and similar threaded fasteners that are not under tensile stresses, nor to screws which form their own mating thread or threaded fasteners having additional self-locking features.
ISO 16047:2005 specifies the conditions for carrying out torque/clamp force tests on threaded fasteners and related parts. It is applicable, basically, to bolts, screws, studs and nuts made of carbon steel and alloy steel, whose mechanical properties are specified in ISO 898-1, ISO 898-2 or ISO 898-6, having ISO metric threads with thread sizes M3 to M39. It is also applicable to the combination of other externally and internally threaded fasteners with a triangular ISO thread according to ISO 68. It is not applicable to set screws and similar threaded fasteners that are not under tensile stresses, nor to screws which form their own mating thread or threaded fasteners having additional self-locking features.
- Avant-proposiv
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1Domaine d'application 1
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2Références normatives 1
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3Termes et définitions 2
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4Symboles et leurs désignations 3
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5Principe de l'essai 4
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5.1Généralités 4
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5.2Détermination des coefficients de frottement 4
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5.3Détermination du coefficient de rendement du couple K (coefficient K) 4
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5.4Détermination du rapport couple/tension TlF 4
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6Appareillage 5
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6.1Machine d'essai 5
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6.2Montage d'essai 5
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7Pièces de référence 6
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7.1Généralités 6
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7.2Plaques d'appui ou rondelles de référence 7
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7.3Écrous de référence pour les essais de vis et de goujons 8
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7.4Vis de référence pour les essais d'écrous 9
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8Essai dans des conditions normalisées 9
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9Essai dans des conditions spécifiques 9
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10Évaluation des résultats 10
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10.1Détermination du coefficient de rendement du couple (K) 10
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10.2Détermination du coefficient de frottement global (total) (,micro tot) 10
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10.3Détermination du coefficient de frottement dans les filets 4h) 10
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10.4Détermination du coefficient de frottement de la face d'appui (/t) 11
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10.5Détermination de la limite d'élasticité au serrage (en tension) (Fy) 11
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10.6Détermination du couple de serrage à la limite d'élasticité (Ty) 11
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10.7Détermination de la force de serrage à la charge de rupture (Fu) 11
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10.8Détermination du couple de serrage à la charge de rupture (Tu) 12
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11Rapport d'essai 12
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11.1Généralités 12
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11.2Description des éléments de fixation à essayer 12
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11.3Description des pièces de référence 13
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11.4Machine d'essai 14
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11.5Montage d'essai 14
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11.6Conditions environnementales 14
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11.7Conditions spécifiques 14
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11.8Résultats d'essai 15
- Bibliographie16
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