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Purlins:
Material specifications and tolerances
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Specification
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Length
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Thickness
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L£7m
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L>7m
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1.6mm
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2.0mm
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2.8mm
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3.0mm
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4.0mm
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6.0mm
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|
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*L£6m
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*L>6m
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-2.3mm
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-3.2mm
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-4.5mm
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JIS 3350 SSC400
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+40mm
-0mm
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7m+Xm: X*5mm
+40mm
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±0.22mm
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±0.25mm
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±0.28mm
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±0.30mm
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±0.45mm
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±0.60mm
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SPIM C100
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+40mm
-0mm
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7m+Xm: X*5mm
+40mm
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±0.22mm
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±0.25mm
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±0.28mm
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±0.30mm
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±0.45mm
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±0.60mm
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SS104*
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+30mm
-5.0mm
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6m+Xm: X*5mm
+40mm
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+0.20mm
-0.10mm
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+0.20mm
-0.12mm
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+0.25mm
-0.15mm
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+0.30mm
-0.17mm
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+0.35mm
-0.20mm
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+0.40mm
-0.22mm
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BS5950 P7**
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±3.0mm
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±0.17mm
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±0.18mm
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±0.20mm
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±0.22mm
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±0.24mm
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±0.26mm
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| *For SS104 the tolerance for the length has a
change at 6metres, and the intervals between the thickness are: t<2.0mm,
2.0-2.5, 2.5-3.0, 3.0-3.5, 3.5-4.0, 4.0-4.5, 4.5-5.0, 5.0-6.0mm (the
two last intervals excluded from the table). |
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| **For BS5950 Part 7 the intervals between thickness are: t<2.0mm,
2.0-2.5, 2.5-3.0, 3.0-4.0, 4.0-5.0, 5.0-6.0, 6.0-7.0, 8.0-10.0, 10.0-12.5,
12.5-15.0, 15.0-25.0mm, (the five last intervals excluded from the
table). |
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High-Tensile
Galvanised C and Z Purlins
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Steel grade
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Base steel
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Mechanical properties
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Tolerances
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Zinc
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Thickness
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Yield strength
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Tensile strength
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Minimum elongation
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Depth
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Flange width
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Length
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Hole Centres
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coating
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ASTM
A446, Grade E (mod.)
&
AS
1397 G450
|
1.6mm,
2.0mm and 2.5 mm
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min.
450
N/mm2
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min.
510
N/mm2
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10%
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±1mm
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±2mm
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±3mm
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±1.5mm
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min.
275g/m2
coating
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