JIS G3444 48.6mm Galvanized Steel Pipe (STK400 & STK500)

Our JIS G3444 48.6mm Galvanized Steel Pipe is specifically engineered to meet the stringent requirements of the Japanese Industrial Standard for general structural purposes. Featuring the universally required 48.6mm outer diameter for Asian and international scaffolding systems, these carbon steel tubes are the optimal choice for civil engineering, architectural structures, and footing piles.

Manufactured using premium STK400 and STK500 steel grades, these pipes offer a superior balance of tensile strength and ductility. To combat harsh outdoor construction environments, every tube is coated with a high-density zinc layer of 220g/m², ensuring exceptional rust resistance and an extended service life. Backed by nearly 20 years of manufacturing experience, we provide rigorous testing and certified Mill Test Certificates (MTC) to guarantee absolute structural safety.

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jis g3444 48.6mm galvanized steel pipe (stk400 & stk500)

Technical Specifications

Technical Category Specification Details
Product Name Galvanized Scaffold Pipe / Structural Steel Tube
Standard Compliance JIS G3444
Material Grade STK400, STK500
Outer Diameter (OD) 48.6mm
Wall Thickness 2.0mm – 2.5mm
Standard Length 6m (Normally) or Custom cut-to-size
Surface Treatment Hot-Dipped Galvanized
Zinc Coating Weight 220 g/m²
Testing & Inspection Flattening Test, Bending Test, Hardness Test
Minimum Order (MOQ) 25 Tons

Key Advantages

High Tensile STK400/STK500 Steel: Our tubes utilize STK400 and STK500 grades, which guarantee a minimum tensile strength of 400 MPa and 500 MPa, respectively. This provides a vastly superior load-bearing capacity compared to lower grades (like STK290), ensuring the safety of heavy-duty scaffolding and pile structures.
Comprehensive Mechanical Testing: Safety is non-negotiable. Every batch undergoes mandatory flattening, bending, and hardness tests during in-line production. The exact results are fully documented and provided on the original Mill Test Certificate (MTC).
Enhanced Anti-Corrosion Protection: A robust zinc coating of 220g/m² acts as a powerful barrier against rust, moisture, and alkaline environments, maximizing the reusability of the scaffolding tubes over many years of tough construction work.
Global Export Expertise: With an annual production capacity of 100,000 MT and exports reaching 70,000 tons, our factory has a deep understanding of standard compliance for heavy buyers across Malaysia, Singapore, Japan, the Middle East, and Western markets.

Product Applications

Scaffolding Systems: The primary vertical and horizontal structural supports for scaffolding compliant with JIS regulations.
Civil & Architectural Structures: Core framework tubes for steel towers, temporary bridges, and large-span construction supports.
Foundation & Footing Piles: High-strength tubes used as structural footing piles and deep foundation piles in engineering projects.
Landslide Suppression: Specifically utilized as reinforcement piles for landslide prevention and soil stabilization projects.

Packaging & Delivery

Professional Export Packaging: The 48.6mm pipes are packed in tight, seaworthy bundles using heavy-duty steel strips to prevent friction and structural deformation during transit.
Cut-to-Size Flexibility: While the standard length is 6 meters, our factory offers precise cut-to-size services to fit your specific logistics or on-site engineering needs.
Optimized Shipping via Tianjin: Located near Xingang Port (Tianjin), we ensure rapid, cost-effective loading onto bulk carriers or 20ft/40ft containers.
Lead Time & Minimum Order: With a standard MOQ of 25 tons (equivalent to one full container), our fast production cycle guarantees efficient delivery schedules for global construction contractors.

Frequently Asked Questions (FAQ)

Q: What is the primary difference between JIS G3444 and EN39 scaffolding tubes?
A: The most critical difference is the Outer Diameter (OD). JIS G3444 scaffolding tubes have an OD of 48.6mm, whereas the European EN39 standard specifies 48.3mm. It is crucial to purchase the correct 48.6mm JIS couplers to ensure a safe, slip-free connection.

A: “STK” stands for Steel Tube for structural purposes in the Japanese standard. The “400” indicates that the carbon steel tube has a minimum tensile strength of 400 MPa, providing the ideal balance of strength and ductility for construction.

A: Yes, absolutely. We provide a comprehensive MTC with every shipment. For JIS G3444 standard pipes, this certificate specifically includes the exact results of the flattening, bending, and hardness tests.

A: Yes, our QC team performs in-line inspections and final loading quality evaluations to verify that the hot-dipped galvanized layer strictly meets or exceeds the 220g/m² specification for maximum rust protection.

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