Return to Propping Systems

Cassaform Acrow Props

Cassaform’s Acrow Props are now available to buy and hire in Melbourne. They are well known and accepted in the construction industry and have been used for many years, on many building sites, in many different applications. It provides a simple, quick and easy method of providing temporary support where it is needed.

The Cassaform Range of Props

Cassaform No.4 Prop

  • Cassaform No.4 Prop – are fully adjustable and have a SWL of 20kn at 3100mm through to 7kn at 4900mm.

Cassaform No.3 Prop

  • Cassaform No.3 Prop – are fully adjustable and have a SWL of 35kn at 2170mm through to 7kn at 3975mm.

Cassaform No.2 Prop

  • Cassaform No.2 Prop – are fully adjustable and have a SWL of 39kn at 1900mm through to 11kn at 3400mm.

Cassaform No.1 Prop

  • Cassaform No.1 Prop – are fully adjustable and have a SWL of 34kn at 1600mm through to 12kn at 2800mm.

Cassaform No.0 Prop

  • Cassaform No.0 Prop – are fully adjustable and have a SWL of 42kn at 1050mm through to 22kn at 1830mm.

Note:- specifications may vary slightly from time to time from those noted above.


Acrow Props are used to support the concrete slab above while the concrete is curing. To increase the load carring capacity, the acrow props are doubled up at each support point. This way when the slab is cured sufficently, an acrow prop from each support point can be removed. Once fully cured the remaining acrow props can be removed. They are a fast and efficient propping solution. They come in 5 differtent sizes so you can find the right Acrow Prop for your project.

  • They are the simplest, quickest, most reliable and economic method of temporary support.
  • They are available in 5 different sizes covering a range from 1050 mm up to 4900 mm
  • You also have the option to Rent, Hire or Buy, whatever is the most cost effective method for your project.
  • Fully adjustable.
  • Special Rental Rates For Large Orders or Long Hire Periods.



History of acrow props

The props was invented by Swiss-born man called William de Vigier who came to England in 1935. William designed the adjustable prop when he recognised that traditionally builders would cut a specific size timber prop to fit for each job and application. The break for William’s adjustable props came when his props was adopted by a few large builders in London. By 1939, over 40,000 Acrow props were in use in the construction industry.

William de Vigier’s company was named the Acrow Group, after his solicitor Mr A. Crowe. He adopted this name as, like Kodak, it was an easily pronounceable and it also had an added advantage that it also appeared early in alphabetical lists.

What is an acrow prop?

An Acrow prop is a piece of construction equipment. It is a telescopic tubular steel prop, used as a temporary support in the building and construction industry. It typically has a built in screw jack system which can be extended and reduced to fit varies heights.

Outside Australia an Acrow prop may also be known as a jack post, adjustable post, telescoping prop, screw jack, adjustable steel column, adjustable steel prop, adjustable metal prop, as well as an adjustable shoring post.

Acrow Props in Australia generally come in the following standard sizes and capacities

  • Size 0 – Height Range 1050mm to 1850mm – Capacity Range 42.5kN to 23kN
  • Size 1 – Height Range 1600mm to 2800mm – Capacity Range 34.0kN to 13kN
  • Size 2 – Height Range 1900mm to 3400mm – Capacity Range 39.0kN to 11kN
  • Size 3 – Height Range 2170mm to 3975mm – Capacity Range 35.5kN to 7.5N
  • Size 4 – Height Range 3100mm to 4900mm – Capacity Range 21.0kN to 6kN

Note – Extreme caution should be used when ordering acrow props for a particular application because unfortunately cheaper imported products made from lower grade steel are also available which may significantly lower capacities. Please request capacities from your supplier.

The working safe load for a given prop varies according to the distance between its ends and the eccentricity of the load relative to the longitudinal axis of the prop. The longer the prop is extended the lower the safe working load of the prop is. Eccentric loads can also reduce the capacity of props significantly.

What kind of jobs are acrow props suitable for?

Acrow props are mostly used for shoring: temporary supports during building repair or alteration work. A typical application for an acrow prop which the acrow prop is synonymous for use is to support an existing horizontal beam when its original masonry supports are removed or repaired. When masonry itself is to be supported, holes are first knocked through the brickwork and a ‘needle’ or ‘strongboy’ is placed through the hole. A pair of Acrow props are then used, one under each end. Existing windows or doorways may be supported directly, or via needles.

The base and top plate of Acrow props are quite small and generally measure at 150×150 steel plate, so they are suitable for supporting a vertical loads but are at risk of toppling if there is any lateral or sideways load. In the event that side load exists then the props should be braced to increase stability.

Steps involved in erecting an Acrow prop

Acrow props are adjustable in height in two ways: The first adjustment is via a loose pin through a series of holes in the inner tube which gives a wide range of coarse adjustments. The second form of adjustment comes through a large diameter screw jack thread formed on the outside of the tube itself which allows finer height adjustment over a short range. The screw thread also allows the props to be tightened when already in place and to adjust the load that each acrow prop takes.

Extra Accessories available for acrow props?

Acrow props are generally a self-contained and complete item within themselves however acrow props can be used with other standard accessories and components. For example

  • Base & Top Plates – usually a timber sole board and timber sleeper to help distribute the point load created by the acrow prop on the bearing surface(s)
  • Steel tube and fittings used to laterally cross brace the props to prevent sideward movement.
  • Strongboys used to needle through existing masonry walls
  • Steel or timber beams required to support and distribute the load

What are the transport requirements?

As mentioned above Acrow props come in variety of different sizes. Consequently their unit weight also varies from approximately 13kg to 30kg each. Transportation requirements of Acrow Props will be dependent on size and quantities required for your project therefore can vary from a small utility vehicle right through the semi-trailers.

Please consult a Cassaform representative on 1300 745 674 for a detailed quotation for your specific quantities and sizes required. We can then advise you on your transportation requirements if you wish to arrange your own transport or can even provide you with a transportation costing estimate if preferred.

Please Email your enquiry now

Email Us Details About Your Enquiry Now… And A Cassaform Propping Consultant Will Help You Find The Right Propping Solution For Your Project.

Cassaform is a leading provider of construction props for construction projects and building sites. Our wide range of propping solutions includes Acrow Props, Superprops, Pilosio Aluminum Props, Peri Props hire right up to our 100 tonne Super100 Props, which in most cases, will ensure that Cassaform can provide you with a propping solution to suit your specific requirements. So if your project requires construction props, then please send us an email and a Cassaform Propping Consultant will contact you to discuss your project.