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Pre-Galvanised Steel Tube GS300

Tube Sizes and Specifications

Pre-Galvanised Steel Tube | GS300 Specifications

Base Material

Manufactured using New Zealand made, continuously hot-dipped galvanised G250 steel coil.

Key Benefits

  • GS300 features a Z275 (ZB135/135) coating with external weld seam zinc repair, ensuring coating continuity.
  • The product features a smooth and consistent surface finish, is highly formable and is particularly suitable for outdoor and corrosion prone environments where long term durability is essential.
  • Typical applications include outdoor structures, furniture, fencing and conveyors.

Precision GS300 Tube Size Tables

GS300 Round Tube Sizes
GS300 Square Tube Sizes
GS300 Rectangle Tube Sizes
HR350 Specifications
Base Material Continuously hot-dip galvanised (Galvsteel® G250)
Yield Strength 250MPa (BM)
Tensile Strength 320 MPa (BM)
Base Material Standard (GS): AS/NZS 1365:1996 (R2016), AS 1397:2021
Product standard AS 1450
Surface Finish Z275 coating (both sides). Medium Spangle
Coating Suitability Excellent for Powder Coating and Paint
Standard stocked lengths 5.5m. Custom lengths available.
Tube Profile Round, Square, Rectangle, Flat-Sided Oval
Tube Thickness From 1.2mm to 2.5mm
Size Range - Round From 15.9mm to 76.2mm
Size Range - Square From 19.1mm to 40.0mm
Size Range - Rectangle 25.4 x 12.7mm
Typical Applications: Outdoor structures, furniture, fencing, conveyors
G250 (GS) Base Material - Typical Mechanical Properties
Yield strength Tensile strength EI % on Lo=50mm
250 MPa 320 MPa 27

Precision Tube GS300 Sizing - Round

GS300 Round Tube
Size (mm) Product Type & Gauge (mm) Finish Nom Linear mass (kg/m) Length
per pack
GS300 (Gauge displayed for Stocked Lines) 1.2 1.4 1.6 2.0
15.9 1.2, 1.6 0.43 0.50 0.57 0.67 100
19.1 1.6 0.51 0.61 0.68 0.83 100
22.2 1.6 0.61 0.72 0.81 0.98 100
25.4 1.2, 1.6 0.71 0.83 0.93 1.15 100
31.8 1.6 0.87 1.04 1.17 1.43 48
38.1 1.2, 1.6 0.87 1.04 1.17 1.43 48
50.8 2.0, 2.5 1.42 1.67 1.88 2.35 48
57.2 1.6 1.61 1.89 2.14 2.66 24
76.2 1.6, 2.0 2.56 2.89 3.59 24

Precision Tube GS300 Sizing - Square

GS300 Square Tube
Size (mm) Product Type & Gauge (mm) Finish Nom Linear mass (kg/m) Length
per pack
GS300 (Gauge displayed for Stocked Lines) 1.2 1.4 1.6 2.0
19.1 x 19.1 1.6 0.64 0.75 0.83 1.00 100
25.4 x 25.4 1.6 0.89 1.03 1.17 1.42 100
31.8 x 31.8 1.6 1.11 1.31 1.48 1.79 50
40.0 x 40.0 1.6 1.43 1.67 1.89 2.26 49

Precision Tube GS300 Sizing - Rectangle

GS300 Rectangle Tube
Size (mm) Product Type & Gauge (mm) Finish Nom Linear mass (kg/m) Length
per pack
GS300 (Gauge displayed for Stocked Lines) 1.2 1.4 1.6 2.0
25.4 x 12.7 1.6 0.65 0.76 0.84 1.06 50
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