Final Inspection Tolerances
In accordance with most production methods, tolerances are necessary to cover variations in the actual process and to allow for tool wear. Differences in surface texture, as with perforated and patterned products, can also affect dimensional accuracy.
GA 5* final inspection tolerances have been carefully selected as appropriate to satisfy the needs of the architectural market. These clearly defined fabrication limits help to minimise and / or prevent difficulties arising in the majority of on-site erection or assembly projects. If it is considered tighter accuracy is required we will be pleased to confirm if this is possible. Unless otherwise stated at the time of quotation and/or ordering, fabricated items produced by our Company will comply with the GA 5* Fabrication standard.
Table GA 1
Cut lengths – overall tolerances
Sawn +/– 1.00mm
Sheared +/– 1.00mm
Table GA 2
Cut lengths – angular tolerances
Sawn +/– 0.50°
Sheared +/– 1.00°
Table GA 3
Sections and flanges formed by press brake and other folding methods.
Allowable deviation from angle specified
Plain sheet +/– 1.00°
Perforated sheet +/– 1.00°
Patterned sheet +/– 1.00°
Table GA 4
Sections & flanges formed by press brake and other folding methods.
Tolerances from given sizes and flanges
Plain sheet +/– 0.50mm
Perforated sheet +/– 2.00mm
Patterned sheet +/– 2.00mm
Table GA 5
Rolled components after fabrication.
Allowable deviation from intended curve or camber at mid-length of curved portion
Sheets +/– 5.00mm per metre of curved length
Profiles +/– 5.00mm per metre of curved length
Table GA 6
Tolerances on holes, punched or drilled (not part of perforated configurations)
On isolated holes +/– 1.00mm
On group of holes relative to each other +/– 0.50mm
