Material specifications



Purlins: Material specifications and tolerances


Specification

Length

Thickness

 

L7m

L>7m

1.6mm

2.0mm

2.8mm

3.0mm

4.0mm

6.0mm

 

*L6m

*L>6m

 

-2.3mm

 

-3.2mm

-4.5mm

 

JIS 3350 SSC400

+40mm

-0mm

7m+Xm: X*5mm

+40mm

0.22mm

0.25mm

0.28mm

0.30mm

0.45mm

0.60mm

SPIM C100

+40mm

-0mm

7m+Xm: X*5mm

+40mm

0.22mm

0.25mm

0.28mm

0.30mm

0.45mm

0.60mm

SS104*

+30mm

-5.0mm

6m+Xm:  X*5mm

+40mm

+0.20mm

-0.10mm

+0.20mm

-0.12mm

+0.25mm

-0.15mm

+0.30mm

-0.17mm

+0.35mm

-0.20mm

+0.40mm

-0.22mm

BS5950 P7**

3.0mm

0.17mm

0.18mm

0.20mm

0.22mm

0.24mm

0.26mm


*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).
**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).

High-Tensile Galvanised C and Z Purlins

Steel grade

Base steel

Mechanical properties

Tolerances

Zinc

 

Thickness

Yield strength

Tensile strength

Minimum elongation

Depth

Flange width

Length

Hole Centres

coating

ASTM A446, Grade E (mod.)

&

AS 1397 G450

1.6mm, 2.0mm and 2.5 mm

min.

450 N/mm2

min.

510 N/mm2

10%

1mm

2mm

3mm

1.5mm

min. 275g/m2

coating


 

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