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Mild Steel Roll Cage Tube

A New Zealand manufactured steel tube to MotorSport NZ’s ITM-MSNZ-Q29 standard

Mild Steel Roll Cage Tube Specifications

Industrial Tube’s Mild Steel Roll Cage Tube (ITM-MSNZ-Q29 Mild Steel) is manufactured in New Zealand to MotorSport NZ’s ITM-MSNZ-Q29 standard, ensuring compliance for sanctioned events and backed by full batch traceability with test certificates supplied for every order. Designed for safety and protection, it provides the strength to withstand significant forces in a roll-over or crash while maintaining a controlled failure mode to absorb impact energy.

The tube is longitudinally welded using HFIW, with weld integrity verified through flattening and flaring tests. It offers reliable weldability with both MIG and TIG processes and is well suited to precision cutting and forming, allowing fabricators to achieve accurate fits and complex cage geometries.

HR350 Specifications
Base Material Special grade of Hot-rolled, pickled and oiled steel, New Zealand Steel Tube 300.
Yield Strength 250MPa (BM)
Tensile Strength 350 MPa (BM)
Base Material Standard AS/NZS 1365:1996 (R2016)
Product standard Manufactured to MotorSport New Zealand’s ITM-MSNZ-Q29 standard. Mill test certificates provided on request.
Surface Finish Steel grey, semi-bright finish
Weldability MIG or TIG welding methods.
Standard stocked lengths 4.0m & 5.5m. Custom lengths available.
Tube Profile Round
Tube Thickness 2.6mm
Size Range - Round 31.8, 38.1, 44.5 and 50.8 Note: Only 38.1 and 44.5 are approved for the principal structure by MotorSport New Zealand
Typical Applications: Safety Cages
ITM-MSNZ-Q29 Mild Steel Base Material - Typical Mechanical Properties
Yield strength Tensile strength EI % on Lo=50mm
250 MPa 320 MPa TBA

ITM_MSNZ_Q29 Tube Sizing

ITM_MSNZ_Q29 Round Tube
Size (mm) Product Type & Gauge (mm) Finish Nom Linear mass (kg/m) Length
per pack
ITM_MSNZ_Q29 1.6 2.0 2.6
22.2mm | 7/8" 0.81 5.5m
25.4mm | 1" 0.93 1.16 1.41 5.5m
31.8mm | 1 1/4" 2.6 1.17 1.43 1.80 5.5m
34.9mm | 1 1/4" 1.3 1.63 2.0 5.5m
38.1mm 1 1/2" 2.6 1.36 1.78 2.13 5.5m
41.3 | 1 5/8" 1.6 1.96 2.39 5.5m
44.5mm | 1 3/4" 2.6 1.65 2.03 2.52 5.5m
50.8mm | 1" 2.6 1.98 2.44 3.02 5.5m
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