Explore our industrial-grade structural steel and piping components tailored for extreme load-bearing configurations.
In the structural engineering and modern construction sectors, adjustable steel shoring props are recognized as the primary method of temporary vertical support. Among the standard classifications of these props, the Acrow Prop No 4 represents the largest structural configuration, offering the highest extension capacity and specific structural load profiles. Developed to support high-clearance slabs, heavy concrete beam castings, and tall building masonry work, the No 4 prop extends from a closed length of approximately 3.2 meters (10.5 feet) to a fully extended height of 4.9 meters (16 feet).
| Specification Parameter | Inner Tube Details | Outer Tube Details |
|---|---|---|
| Outer Diameter (OD) | 48.3 mm | 60.3 mm |
| Standard Wall Thickness | 3.2 mm / 4.0 mm | 3.2 mm / 4.0 mm |
| Extension Range | 3.2 Meters (Closed) to 4.9 Meters (Fully Extended) | |
| Ultimate Steel Grade | Q235B / Q345B / S235JR / S275JR Structural Steel | |
| Corrosion Protection | Hot-Dip Galvanized (HDG), Pre-Galvanized, Electro-Galvanized, Painted | |
Purchasing Acrow Props from certified Chinese manufacturers like Tianjin Minjie Steel Co., Ltd. provides strategic advantages in engineering design, raw material sourcing, and automation-driven cost efficiency.
Tianjin’s proximity to primary steel mills ensures access to verified, structural-grade carbon steel. Minjie utilizes premium steel coils with optimized manganese-to-carbon ratios, improving weldability and yield strength.
Acrow Props require precision-rolled threads to prevent slippage under load. Our advanced CNC threading machines produce clean, self-cleaning, low-friction threads on the outer tube, allowing easy height adjustments.
We utilize robotic CO2 shielded arc welding systems to connect baseplates and collars. This eliminates human error, resulting in uniform weld penetration and minimal structural failure points.
Established in 1998, Tianjin Minjie Steel Co., Ltd. has grown into an international manufacturer of steel pipe and scaffolding systems. Operating from a 70,000 square meter facility located just 40 kilometers from XinGang Port—the largest port in Northern China—we provide efficient logistics for global shipping.
Our production capabilities include 4 pre-galvanized product lines, 8 ERW steel pipe product lines, and 3 hot-dipped galvanized process lines. We manufacture products to international standards including GB, ASTM, DIN, and JIS, under an ISO9001-certified quality control framework.
Through product development, we have secured patents for specialized piping connections, including Groove pipe, Shoulder pipe, and Victaulic pipe.
With an annual output exceeding 300,000 tons, our products support major structural steel construction projects, agricultural greenhouse fabrication, railway safety fencing, machinery structures, and heavy scaffolding projects. We are recognized by local and municipal authorities for our quality standards.
Our technical advisors and engineering staff work directly with international clients to customize steel pipe wall thicknesses, surface finishes, and configurations to meet local building codes.
We supply temporary support and steel fabrication products to structural projects worldwide. Below are highlights of client visits and regional projects.
In September 2019, our team visited clients in Singapore to review shoring requirements for high-density residential structures. Our products received praise for quality and safety standards.
In 2019, Korean structural engineers visited our facility to coordinate custom designs, establishing supply channels for localized scaffolding systems.
Long-term Australian clients visited our factory in November 2018 to perform quality audits and verify compliance with Australian shoring standards (AS 3610).
In 2019, Indian clients selected our plant for supply after reviewing multiple options, signing contracts for 10 container shipments per month.
In June 2017, a Lebanese engineering procurement group visited our factory, ordering 1,000 tons of structural steel pipes.
Met at the Canton Fair in 2018, our Saudi Arabian clients established a long-term supply agreement for infrastructure project support.
Our manufacturing facility utilizes heavy machinery and advanced testing tools to ensure structural integrity across all production lines. Below is a view of our physical operations and international certification standards.
Minjie products undergo strict testing to ensure structural compliance in global jurisdictions. Our operations are validated under ISO 9001 and municipal safety bodies.
We participate in the annual Canton Fair and international steel exhibitions. These events allow us to meet with global structural engineering firms and plan bulk steel piping supplies. Up to 80% of our new clients visit our Tianjin manufacturing plant after meeting at these expos.
The Acrow Prop No 4 is designed for high-reach temporary structures where safety and load capacity are critical. Key applications include:
Commercial and industrial projects often require slab support heights exceeding 4 meters. The No 4 prop provides vertical shoring for these pours, reducing the need for complex scaffolding systems.
During bridge deck casting and tunnel arch formwork, structural loads are concentrated on single supports. The No 4 prop handles these loads when braced properly with horizontal structural tubes.
When modifying structural masonry walls, No 4 props work as temporary vertical needles. They carry gravity loads from upper stories down to the foundation, ensuring safety during wall modifications.
The choice of finish directly impacts the service life and cost of your shoring assets. Our factory provides options tailored to project environments:
Modern construction demands higher safety factors, material traceablity, and lighter yet stronger structures. In the shoring industry, we observe key trends:
By utilizing advanced micro-alloyed carbon steels, we can reduce prop weight without compromising load capacity, improving handling safety on-site.
Self-cleaning thread designs shed wet concrete and rust automatically when adjusting the collar, reducing maintenance down-time for equipment rental yards.
Our hot-dip galvanizing lines incorporate closed-loop chemical scrubbing, reducing environmental impact while delivering rust protection that meets modern standards.
Technical answers for procurement officers and structural engineers managing complex structural projects.
At its maximum extension of 4.9 meters, the load capacity of a standard No 4 prop decreases due to the higher buckling risk of the extended inner tube. A typical Q235B steel prop with 3.2mm wall thickness has a Safe Working Load (SWL) of approximately 8 kN to 11 kN when fully extended, depending on the eccentricity of the load. When closed to 3.2 meters, capacity rises to 20 kN or higher. Always consult structural engineers for safety factor configurations.
We use high-frequency ERW welding mills that maintain tube straightness tolerances within 1/1000 of the total length. Bent props are the leading cause of early buckling. Before shipment, random samples from each batch undergo compression tests to verify yield point load capacities.
Yes. We can customize the dimensions of the base plates (typically 150mm x 150mm x 6mm or 8mm), pin hole diameters, and wall thicknesses (up to 4.0mm) to meet specific load configurations. Custom color powder coatings are also available for branding.
We offer both standard rolled V-threads and heavy-duty ACME square threads. The ACME thread design provides higher load handling capacity and sheds dirt and cement splatter during height adjustments.
Tianjin Minjie Steel Co., Ltd. supplies a wide range of steel products. Our portfolio includes hot-rolled angles, square tubes, steel coils, and scaffolding boards.
Heavy-duty structural sections, spiral welded tubes, and high-tensile wire rope designs.
Below is a directory of specific steel configurations, pipe dimensions, and project materials processed in our facility:
Minjie Steel
