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HST Top Hats

Steel & Tube HST Top Hat sections are an economical option. They are lightweight, versatile, and an easy to use product that can be used for roof purlins, wall girts and floor joists.

HST Top Hats are manufactured from high strength Z275 galvanised steel coil in accordance with AS 1397 that provides good protection in most exposed internal environments. They are ready for use in smaller spanning applications from 3m to 7m.

Contact with materials not compatible with zinc should be avoided.

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HST Top Hats

HST Top Hat purlins are manufactured from hot dipped galvanised steel with a coating weight of 275 gram/sqm, in line with other common lightweight steel structural building products.

HST Top Hat purlins are easy to use as they fasten directly to their supports, resulting in a saving on cleats. The symmetrical section means there are no requirements for braces or nogs to prevent twisting and the profile is easily lapped for optimal performance.

HST Top Hats come in a full range of sizes from 60mm to 150mm depth, are easy to use, and screw directly to the supports without the need for purlin bracing and cleats.

 

Steel Thickness, Grade and Zinc Weight
Steel Thickness
T(BMT)
MM
Steel GradeYield Strength
Fy(MPa)
Zinc Weight Z(g/m²)
0.75G550550275
0.95G550550275
1.15G500500275
Tolerances
Length±6mm
Depth/Width60 Top Hat purlin: ±1mm
100/120 Top Hat purlin: ±2mm
150 Top Hat purlin: ±3mm
Top Flange Width±1mm

Lengths

HST Top Hat sections are available in long run lengths up to 12 metres, depending on the available transport and handling facilities.

Design Information

The HST Top Hat Purlin System does not require bracing to provide restraint. The typical spans are designed to give information for preliminary design and costing and are based on the factors noted.

Handling and Storage

HST Top Hat sections must be kept dry during transportation and storage as water between the stacked sections will cause premature corrosion. If it gets wet, it is recommended to separate and stack openly to allow for ventilation to dry the surface. Cutting, if required, should be done with a shear or hacksaw, use of abrasive disc blades is not recommended.

Tophats SizeProduct ChartHeight (mm)Material Thickness (mm)Lengths Availablekg per m
HST 6060 x 0.75mm
60 x 0.95mm
60
60
0.75
0.95
Run to Order
Run to Order
1.225
1.531
HST 100100 x 0.75mm
100 x 0.95mm
100
100
0.75
0.95
Run to Order
Run to Order
1.947
2.434
HST 120120 x 0.75mm
120 x 0.95mm
120
120
0.75
0.95
Run to Order
Run to Order
2.198
2.748
HST 150150 x 0.95mm
150 x 1.15mm
150
150
0.95
1.15
Run to Order
Run to Order
3.219
3.862
150 x 1.55mm1501.55Run to Order5.23
Click the BIM-spec link for access to a large library of BIM-enabled 2D and 3D CAD roofing details (.rfa, .pdf, .dwg).
Click the MASTERSPEC link for direct access to the Steel & Tube branded work sections in MASTERSPEC.
Click the SMARTSPEC link for direct access to the Steel & Tube branded work sections in SMARTSPEC.
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