AST YST 310 125 NB MS CHS - (139.7 x 4.5 mm) - 6 mtr Length
AST YST 310 125 NB MS CHS - (139.7 x 4.5 mm) - 6 mtr Length
Specifications
| Diameter | 139.7 mm |
|---|---|
| Length | 6 m |
| Nominal Bore | 125 NB |
| Thickness | 4.5 mm |
Description
Precision-formed and IS-certified, the AST YST 310 125 NB MS CHS - (139.7 x 4.5 mm) - 6 mtr Length from AST PIPES is a cold-rolled ERW CHS in YST 310 structural steel conforming to IS 1161:2014 (Steel Tubes for Structural Purposes). The 139.7 mm OD × 4.5 mm wall (125 NB) section in 6 m lengths is a large-diameter circular section engineered for primary structural columns, heavy trusses, and industrial frames delivering the maximum yield strength enabling slender, efficient circular sections under heavy combined loads demanded by heavy-duty structural, high-load, and long-span applications, with tight wall-thickness tolerance, consistent roundness, and smooth internal bore. Equal stiffness in all transverse directions simplifies structural analysis and enables connection detailing on any face of the circular section.
Key Features:- Grade YST 310 steel: minimum yield strength 310 MPa, tensile strength 450 MPa
- Circular hollow profile 139.7 mm OD × 4.5 mm wall — equal stiffness and bending resistance in all directions
- Uniform wall thickness of 4.5 mm maintained throughout the full 6 m length
- Cold-formed ERW manufacturing ensuring high-integrity, flush weld seam quality
- Conforms to IS 1161:2014 — IS-marked with full batch mill certification
- High strength-to-weight ratio enabling slender, efficient structural and architectural sections
- Excellent weldability — compatible with MIG, TIG, SMAW, and orbital welding processes
- Nominal bore 125 NB: compatible with standard flanges, couplings, and saddle connections
- Square-cut ends for precise measurement and clean joint preparation on site
- Smooth mill-finish external surface suitable for painting, galvanising, or powder coating
- Structural columns, posts, and compression struts in industrial and commercial buildings
- Pre-Engineered Building (PEB) columns, bracing members, and diagonal struts
- Circular truss chord members and web diagonals in roof and bridge trusses
- Handrails, balustrades, stair stringers, and safety guardrail systems
- Gate posts, fencing columns, bollards, and perimeter security structures
- Flagpoles, lighting columns, signage poles, and street furniture supports
- Scaffolding standards, shoring frames, and temporary support structures
Specifications
| Base | Detail |
|---|---|
| Diameter | 139.7 mm |
| Length | 6 m |
| Nominal Bore | 125 NB |
| Thickness | 4.5 mm |
Mechanical & Chemical Composition
Main Specifications
| Base | Detail |
|---|
Chemical Composition
| Base | Detail (%) |
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