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ISO 18953:2025

Steel structures — Structural bolting — Test methods to determine loss of pretension from faying surface coatings

Standard Details

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.

General Information

Status : Published
Standard Type: Main
Document No: ISO 18953:2025
Document Year: 2025
Pages: 11
Edition: 1
  • Section Volume:
  • ISO/TC 167. Steel and aluminium structures

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ISO 18953:2025
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