Square Tube Sizes and Weight Chart — South Africa
Updated: Sep 15
Last updated: August 2026
Looking for a square tube weight chart, square steel tube sizes, or the weight of a specific SHS (Square Hollow Section) per metre?
This guide provides a practical reference for Square Tube Sizes and Weight Chart South Africa, including common square tube sizes, wall thicknesses, approximate weight per metre and estimated weight per 6-metre length. ⚖
Whether you're a fabricator, contractor, engineer, builder, manufacturer, steel reseller or student, understanding square tube weight can help when calculating material requirements, project costs, transport requirements and steel quantities. 🏗️🔧📦
📏 What Is Square Hollow Section (SHS)?
Square Hollow Section (SHS) is a hollow steel profile manufactured with a square cross-section.
Square steel tubing is widely used throughout South Africa for:
🏗️ Construction🔧 Fabrication🚪 Gates🛡️ Security structures🏠 Carports🧱 Frames🚛 Trailers🏭 Manufacturing🌾 Agricultural structures⚙️ Engineering applications
SHS is available in different outside dimensions and wall thicknesses.
The outside size and wall thickness both affect the weight, strength and price of the steel tube.
⚖️ Square Tube Sizes and Weight Chart
The following table provides approximate theoretical/reference masses for commonly used square hollow sections.
📊 Square Tube Sizes and Weight Chart (Weight Per Metre)
🔩 Square Tube Size | 1.6mm kg/m | 2.0mm kg/m | 2.5mm kg/m | 3.0mm kg/m | 4.0mm kg/m | 4.5mm kg/m | 5.0mm kg/m | 6.0mm kg/m |
12.7 × 12.7mm | 0.560 | — | — | — | — | — | — | — |
16 × 16mm | 0.680 | 0.850 | — | — | — | — | — | — |
19 × 19mm | 0.930 | 1.150 | — | — | — | — | — | — |
25 × 25mm | 1.190 | 1.468 | 1.804 | 2.127 | — | — | — | — |
32 × 32mm | 1.515 | 1.875 | 2.312 | 2.738 | — | — | — | — |
38 × 38mm | 1.848 | 2.290 | 2.832 | 3.360 | — | — | — | — |
40 × 40mm | 1.943 | 2.408 | 2.980 | 3.539 | 4.620 | 4.870 | — | — |
50 × 50mm | 2.443 | 3.034 | 3.761 | 4.477 | 5.870 | 6.549 | — | — |
60 × 60mm | 2.763 | 3.660 | 4.491 | 5.416 | 7.105 | 7.939 | — | — |
63 × 63mm | — | — | — | 5.650 | — | — | — | — |
76 × 76mm | 3.686 | 4.588 | 5.704 | 6.808 | 8.978 | 10.045 | — | — |
80 × 80mm | — | — | — | 7.130 | 9.340 | 11.440 | — | — |
100 × 100mm | — | 6.166 | 7.677 | 9.175 | 12.135 | 13.569 | 15.030 | 17.907 |
📌 Important: These figures are provided as reference values. Actual manufactured steel weight can vary depending on the manufacturer's specification, wall-thickness tolerances, corner radii and production tolerances.
📦 Approximate Weight Per 6-Metre Length
Most structural steel tubing supplied in South Africa is commonly sold in 6-metre lengths.
To estimate the weight of a 6m length:
kg/m × 6 = approximate weight per 6m length
For example:
5 kg/m × 6m = 30kg
The following table converts the reference kg/m values above into approximate 6-metre weights.
🔩 Square Tube | 1.6mm | 2.0mm | 2.5mm | 3.0mm | 4.0mm | 4.5mm |
12.7 × 12.7mm | 3.36kg | — | — | — | — | — |
16 × 16mm | 4.08kg | 5.10kg | — | — | — | — |
19 × 19mm | 5.58kg | 6.90kg | — | — | — | — |
25 × 25mm | 7.14kg | 8.81kg | 10.82kg | 12.76kg | — | — |
32 × 32mm | 9.09kg | 11.25kg | 13.87kg | 16.43kg | — | — |
38 × 38mm | 11.09kg | 13.74kg | 16.99kg | 20.16kg | — | — |
40 × 40mm | 11.66kg | 14.45kg | 17.88kg | 21.23kg | 27.72kg | 29.22kg |
50 × 50mm | 14.66kg | 18.20kg | 22.57kg | 26.86kg | 35.22kg | 39.29kg |
60 × 60mm | 16.58kg | 21.96kg | 26.95kg | 32.50kg | 42.63kg | 47.63kg |
63 × 63mm | — | — | — | 33.90kg | — | — |
76 × 76mm | 22.12kg | 27.53kg | 34.22kg | 40.85kg | 53.87kg | 60.27kg |
80 × 80mm | — | — | — | 42.78kg | 56.04kg | 68.64kg |
100 × 100mm | — | 36.996kg | 46.06kg | 55.05kg | 72.81kg | 81.41kg |
🔩 G-Tech Steel — Popular 1.4mm Square Tube
G-Tech Steel stocks popular 1.4mm square steel tubing for fabrication, construction and general steel applications.
Our current stock reference weights are:
Product | Wall Thickness | Approx. G-Tech Stock Weight | Length |
19 × 19mm Square Tube | 1.4mm | 4.8kg | 6m |
25 × 25mm Square Tube | 1.4mm | 5.9kg | 6m |
38 × 38mm Square Tube | 1.4mm | 9.3kg | 6m |
50 × 50mm Square Tube | 1.4mm | 12.1kg | 6m |
76 × 76mm Square Tube | 1.4mm | 21.5kg | 6m |
📌 These are G-Tech Steel stock reference weights and should not be treated as universal theoretical weights for every manufacturer's 1.4mm tubing.
📐 Why Does Wall Thickness Matter?
Two square tubes can have exactly the same outside dimensions while having significantly different weights.
For example:
50 × 50 × 1.4mm
and
50 × 50 × 2.0mm
are both 50 × 50mm square tubes, but the 2.0mm tube contains more steel and therefore weighs more.
Wall thickness affects:
⚖️ Weight💪 Strength💰 Price🔧 Fabrication characteristics🏗️ Application suitability
When ordering square tube, always specify:
Outside dimensions + wall thickness + length + quantity
For example:
50 × 50 × 1.4mm × 6m — 100 lengths
This makes it much easier for your supplier to provide an accurate quotation. 📋
🧮 How to Calculate Square Tube Weight
A simple way to estimate the total weight of your order is:
Weight per metre × total metres = total steel weight
For example, if a tube weighs:
2.0kg/m
and you purchase:
100 × 6m lengths
Then:
2.0 × 6 × 100 = 1,200kg
Your estimated order weight would therefore be approximately 1.2 tonnes.
This can be useful when estimating:
🚛 Transport requirements📦 Bundle weights💰 Material costs🏗️ Project quantities⚖️ Structural loads🏭 Production requirements
⚖️ Theoretical Weight vs Actual Steel Weight
Steel weight charts generally provide a theoretical mass calculated from the dimensions and assumed density of steel.
Actual manufactured tubing can vary because of:
🔹 Wall-thickness tolerances🔹 Dimensional tolerances🔹 Corner radii🔹 Manufacturing processes🔹 Production tolerances
For this reason, theoretical weight should be treated as a reference value rather than an exact measurement of every individual tube.
For engineering calculations or large commercial orders where weight is critical, use the manufacturer's certified product specification or actual measured weight.
💰 Does Steel Weight Affect the Price?
Yes. ⚖️💰
The amount of steel contained in a product is an important factor in its underlying material cost.
Generally:
More steel → More weight → More material → Higher cost
This is why you should compare steel quotations using the same specification.
When comparing prices between suppliers, check:
🔩 Product type📏 Outside dimensions📐 Wall thickness⚖️ Weight📦 Quantity📏 Length💰 VAT basis🏪 Stock availability⏱️ Lead time
A lower price isn't necessarily a lower cost if the competing product has a different wall thickness or specification.
🔲 Common Square Tube Sizes in South Africa
Some commonly requested square tube sizes include:
🔩 19 × 19mm
Popular for lighter fabrication, gates, frames, fencing and general steelwork.
🔩 25 × 25mm
A versatile size used for gates, frames, fencing, fabrication and general construction.
🔩 38 × 38mm
Used for heavier fabrication, frames and various structural applications.
🔩 50 × 50mm
A popular larger section used in gates, frames, carports, structures and industrial fabrication.
🔩 76 × 76mm
A larger square section suitable for applications requiring a larger steel profile.
The appropriate size and wall thickness depends on the intended application and required structural performance.
🏗️ What Is Square Tube Used For?
Square tubing is one of the most versatile steel products used in fabrication and construction.
Common applications include:
🚪 Gates & Security
Square tubing is commonly used for gate frames, security structures and fencing.
🏠 Carports & Structures
Larger square sections can be used in frames and structural assemblies where appropriate.
🔧 Fabrication
Fabricators use square tube for frames, supports, machinery components and general steelwork.
🚛 Trailers
Square and rectangular tubing can be incorporated into trailer frames and fabrication projects where suitable.
🏭 Manufacturing
Square tubing is used across a wide variety of commercial and industrial manufacturing applications.
🌾 Agriculture
Square tubing can be used for agricultural structures, frames and equipment fabrication.
📦 Buying Square Tube in Bulk
G-Tech Steel supplies square tubing to:
🏗️ Contractors🔧 Fabricators🏭 Manufacturers👷 Builders📦 Steel Resellers🏢 Commercial Businesses⚙️ Industrial Customers
We also aim to support small and growing businesses that purchase steel for resale.
If you are starting or expanding a steel, fabrication or construction business, purchasing popular sizes in bulk can help you maintain stock and offer competitive pricing to your customers. 📈🤝
📦 Bulk & Wholesale Orders
Contact G-Tech Steel with:
1️⃣ Product size2️⃣ Wall thickness3️⃣ Quantity4️⃣ Required length5️⃣ Required date6️⃣ Whether the steel is for resale or a project
We can then confirm current pricing and availability.
🏪 G-Tech Steel Stock & Lead Times
Some products are available directly from floor stock, while other products may have a typical 2–5 business day lead time. ⏱️📦
Stock levels can change quickly, so customers should contact G-Tech Steel before travelling to confirm:
✅ Current stock✅ Quantity available✅ Current price✅ Lead time✅ Collection arrangements
⚠️ Special or scarce stock may require a deposit to secure the order.
🏦 Bulk Order Payment Terms
Bulk orders must be paid by EFT to the G-Tech Steel bank account.
⏱️ Stock will only be released 24 hours after payment has reflected in the G-Tech Steel bank account.
For large orders, customers should confirm product availability and pricing with G-Tech Steel before making payment.
📍 Square Tube Supplier in Johannesburg & Gauteng
G-Tech Steel is based at:
📍 30 Brunel Street, Thulisa Park, Johannesburg
We supply steel and tube products to businesses throughout Johannesburg and Gauteng, supporting customers ranging from small fabrication and resale businesses to larger commercial and industrial requirements.
Our goal is simple:
🇿🇦 From Township to Towers.
We want to help businesses of all sizes access reliable steel supply — from a small fabricator buying a few lengths to businesses purchasing steel in bulk for resale or large-scale projects. 🤝🏗️📦
🌍 Steel Supply Across Southern Africa
G-Tech Steel is based in Johannesburg and is building relationships with businesses across Gauteng and Southern Africa.
Our target customers include:
🇿🇦 South African businesses🇧🇼 Botswana businesses🇿🇼 Zimbabwe businesses🇲🇿 Mozambique businesses🇳🇦 Namibia businesses🇿🇲 Zambia businesses
For larger or specialised requirements, contact our sales team to discuss your requirements and availability.
💰 Looking for Competitive Square Tube Prices?
Whether you need:
🔩 19 × 19mm🔩 25 × 25mm🔩 38 × 38mm🔩 50 × 50mm🔩 76 × 76mm🔩 100 × 100mm
or another square tube size, G-Tech Steel can help you check current pricing and availability.
For businesses purchasing larger quantities, ask about bulk and wholesale pricing. 📦💰
📲 Contact G-Tech Steel
Looking for square tube prices in Johannesburg, steel tubing in Gauteng, or bulk square tube for resale?
Get in touch with G-Tech Steel.
📞 076 342 4858📧 sales@gtechsteel.co.za📍 30 Brunel Street, Thulisa Park, Johannesburg
🔩 G-TECH STEEL
Steel & Tube SupplyWholesale & Bulk OrdersBusiness & Reseller Supply
🇿🇦 From Township to Towers. 🔩🏗️
📌 Important Note
The weights in this article are intended as general reference information. Actual steel mass may vary according to product specification, manufacturing tolerances and supplier.
Always confirm the exact size, wall thickness, specification, quantity, price and availability with G-Tech Steel before ordering.
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