Threaded Tube

Threaded Tube is the outer sleeve of an adjustable steel prop, a 60.3 mm O.D. steel tube with a rolled 4 TPI external thread running its length and a slot milled along the side to pass the G pin. The threaded surface engages the prop nut for height adjustment. Corona supplies threaded tubes in five UK size series (#0–#4), both as replacement parts for maintaining existing prop fleets and as components for new-build prop assemblies. Specify the size and the quantity you need.

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At a glance

Threaded Tube at a glance.

Tube geometry

60.3 mm O.D., 3.6 mm wall with rolled thread

The tube is cold-rolled steel with a standard 60.3 mm outside diameter and 3.6 mm wall thickness. The 4 TPI thread is rolled on the external surface without cutting, preserving the material strength.

Thread and slot

4 TPI rolled thread with a G pin slot

The 4 TPI thread engages the prop nut for fine height adjustment. A longitudinal slot allows the G pin to pass through without obstruction.

Fleet and new-build supply

Replacement tubes, sizes #0–#4

Damaged or worn threaded tubes are replaced in prop fleets to restore the adjustment mechanism. New threaded tubes are also supplied for assembling replacement props from component parts.

Also known as

Threaded Tubes are prop sleeves in the US; in other languages the part is a tube fileté (French) or Gewindehülse (German).

United States: prop sleeve
Français: tube fileté
Deutsch: Gewindehülse

Trade names for the whole range

How it works

The fixed outer tube carries the adjustable inner tube

The threaded tube is the outer, fixed sleeve of the prop. The inner tube slides inside it and is supported by the G pin resting on the prop nut that threads onto the outer tube. As the nut turns, it travels along the thread, raising or lowering the inner tube's support point. The slot in the side allows the G pin to pass through so the inner tube can be positioned at any height in the range.

Common applications

Where it is used.

Application

Formwork support in slab and beam construction

The threaded tube is the fixed housing of the prop. It carries the threaded nut and provides the support range from closed length to fully extended as the formwork is built up and adjusted.

Application

Falsework towers and back-propping

Multiple props work together in towers beneath slabs and beams. Each threaded tube's adjustment range determines the spacing increment and the height range of that tier in the falsework system.

Application

Fleet replacement and refurbishment

Replace threaded tubes when the thread becomes stripped or the slot is damaged. Supply new tubes to rebuild prop assemblies when the original components cannot be refurbished.

What is a prop threaded tube called in different regions?

Threaded Tube is a prop sleeve in the US, where suppliers list it among the parts of an adjustable steel prop. It is a tube fileté in French and a Gewindehülse in German. Each name refers to the outer sleeve that carries the thread for the prop nut.

What makes a threaded tube fit a prop?

Threaded Tube is the prop's outer sleeve, 60.3 mm outside diameter with a 3.6 mm wall, carrying a 4 TPI rolled thread for the prop nut and a slot for the G pin. Corona makes it for props in sizes #0 to #4.

Scaffolding & Shoring Systems

Part of the adjustable steel prop

The Threaded Tube works with the G Pin and Prop Nut to form the complete adjustable steel prop for formwork and shoring. See how the prop assembly works in the scaffolding and shoring systems.

Explore scaffolding & shoring systems

Threaded Tube specifications