Active standard | Published: 12/12/2025

ISO 18953:2025

Steel structures — Structural bolting — Test methods to determine loss of pretension from faying surface coatings
(Structures en acier — Boulonnerie de construction métallique — Méthodes d’essai pour déterminer la perte de précontrainte due aux revetements de surface)

Available languages: English

Available design: electronic design (pdf), Print design

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Detail information

Designation: ISO 18953:2025

Publication date: 12/12/2025

Pages: 11

Country: International technical standard

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Description / Abstract: This document specifies test methods to determine loss of pretension in high-strength bolts due to the presence of coatings on the faying surface(s) of a bolted joint to be used in structural steelwork, when any of the coatings are thick enough to affect the pretension in a bolt in the short term, or can show significant deformation over time under sustained loads (creep-prone materials). The presence within the grip of the bolt of other materials having considerably smaller stiffness than steel, such as insulation, is not included in this test method.

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