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Quality assurance

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The bolt supplier needs to be asked to provide written certification from the manufacturer that the bolts have been manufactured to AS/NZS 1252. AS/NZS 1252 specifies not only the dimensions of the bolts, nuts and hardened washer but also requirements for their manufacture including testing and quality control. AS/NZS 1252 requires that mechanical properties are in accord with AS/NZS 4291. This written certification, together with confirming that the bolt, nut and washer set carry the correct markings, will provide a high degree of quality assurance.

Unmarked bolts must not be used. If there is no certification that the bolts have been manufactured to AS/NZS 1252, a testing programme for these bolts, as specified by Appendix A of AS/NZS 1252, will be necessary.

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This information is published by the Ministry of Business, Innovation and Employment’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people:

with compliance with the Building Act, it is published under section 175 of the Building Act
with a Weathertight Services claim, it is published under section 12 of the Weathertight Homes Resolution Services Act 2006.

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