Formwork Props
What is Formwork Prop？
Formwork props are adjustable with closed heights and open heights under formwork. It carries loads in concrete slabs, beams, columns, and walls. The post shore are composites of inner tubes, outer tubes, top and bottom plates, props sleeves with treads, robust prop nuts, lock pins, etc.
Shoring post jack is also called adjustable steel props，telescopic prop，adjustable prop，acrow props，prop jacks, steel props, shoring props, formwork props, construction props, shuttering props, building props, steel support, post shore, etc. All acrow propping are adjustable with closed heights and open heights.
Steel props are manufactured by steel scaffold tubes or aluminum tubular profiles. Thus there are formwork props and aluminum scaffold props.
Formwork props can take more weight from the concrete than aluminum props. While the cost is much cheaper too. In order to make the steel shoring posts more durable with longer life, you can ask for hot-dip galvanizing finished post shore jack. HDG formwork props can be repeated using at least 10 years with rusty.
What are the formwork prop components?
Acrow prop components mainly include the following types
1. Base Jack
2. Adjustable scaffolding prop
3. Scaffolding pillar head
4. Light Scaffolding prop
5. Heavy-duty scaffolding prop
Formwork Props(Steel Props) FAQs
1.Q: How do I choose the right size of Steel Prop for my construction project?
A: Selection depends on the Maximum Slab Height and Slab Thickness (Dead Load). For a standard 3.0m ceiling, we recommend a prop with a range of 1.8m - 3.2m. Always ensure the required load (kN) at the maximum extension does not exceed the manufacturer's Load Chart values.
2.Q: Why are Square Threads preferred over V-Threads for scaffolding props?
A: Square Threads (or Acme Threads) are engineered for heavy-axial power transmission. Efficiency: They have zero radial force, meaning the entire load is transmitted axially along the tube. Durability: Square threads provide a larger surface area for contact, reducing thread wear and preventing the nut from "slipping" or "stripping" under extreme pressure. Self-Locking: The geometry ensures the Collar Nut remains stable under vibration.
3.Q: How to choose the right Steel Prop for a 3-meter slab height?
A: For a 3m height, we recommend our Class D Steel Props (EN 1065). With an adjustment range of 1.8m to 3.2m, it ensures a safety working load of at least 20kN at full extension.
4.Q: What is the difference between Italian Type and Spanish Type Steel Props?
A: The main difference lies in the Adjustment Nut and Thread Sleeve. Italian Type props usually feature a sleeve with a top handle for easier rotation, while Spanish Type props often use a simpler, more cost-effective nut system. Both can meet EN 1065 standards if manufactured with high-tensile Q235 steel.
5.Q: Can I use a regular steel bar as a substitute for the G-Hook safety pin?
A: Absolutely not. The G-Hook is made of high-strength tempered steel designed to resist specific Shear Forces. A regular rebar or bolt may have a lower yield strength, leading to sudden shear failure and structural collapse under heavy slab loads.
6.Q: What is the difference between Light Duty and Heavy Duty Steel Props?
A: The distinction lies primarily in tube diameter, wall thickness, and material grade.
Light Duty: Typically features a 48mm outer tube and 40mm inner tube with a wall thickness of 1.5mm to 2.0mm. Best for residential shoring.
Heavy Duty (EN 1065 Standard): Uses 60mm outer and 48mm inner tubes with thicknesses up to 4.0mm. These are designed for industrial infrastructure and high-rise slab formwork where loads exceed 20kN per point.
