Solid and hollow screw stems with matched adjustment nuts and base plates
We manufacture adjustable scaffold base jacks as complete stem, nut and plate assemblies. Solid and hollow stem models have their own diameters, lengths and square base plates in our catalog. Select the assembly to match the receiving standard and its required adjustment detail, then order by model and piece count.
| Stem | Selected solid screw or threaded hollow tube |
|---|---|
| Adjustment nut | Matching thread, handled form and bearing face |
| Plate | Selected square plate, thickness and attachment detail |
| Standard fit | Receiving bore, spindle insertion and bearing contact |
| Adjustment identity | Overall stem length, permitted exposed setting and engagement |
| Finish | Painted, electro-galvanized or hot-dip galvanized route |
Selected complete assembly rows from our adjustable screw-jack catalog. Hollow-stem dimensions include wall thickness; listed masses refer to their stated plate configuration.
| Stem form | Stem dimensions (mm) | Square base plate (mm) | Listed unit mass (kg) |
|---|---|---|---|
| Solid | 30 × 400 | 120 × 120 × 4 | 2.61 |
| Solid | 30 × 600 | 120 × 120 × 4 | 3.58 |
| Solid | 32 × 400 | 120 × 120 × 5 | 3.06 |
| Solid | 34 × 610 | 150 × 150 × 6 | 5.40 |
| Hollow | 38 × 4 × 600 | 150 × 150 × 5 | 3.39 |
| Hollow | 38 × 4 × 660 | 150 × 150 × 6 | 3.77 |
| Hollow | 48 × 4 × 600 | 150 × 150 × 6 | 4.51 |
| Hollow | 48 × 4 × 900 | 150 × 150 × 6 | 5.97 |
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Factory catalog complete base-jack references: solid diameter × stem length; hollow OD × wall × stem length. The selected drawing and scaffold specification define thread/nut fit, insertion, usable adjustment, plate details and applicable loading.
Solid and hollow stems retain different sections and end conditions. The selected model keeps its material, thread profile and receiving-standard fit together with the appropriate nut and plate.
The nut’s contact face supports the receiving component at its intended bearing surface. That seat, its diameter and the thread engagement follow the complete base-jack and standard detail.
Plate size, thickness and attachment define the steel part at the bottom of the assembly. The scaffold’s specified sole-board or foundation arrangement establishes the supporting surface beneath that plate.
EN 74-3 covers plain base plates and loose spigots. A base plate with a means of limited vertical adjustment, a base jack, is dealt with in EN 12811-1 instead, so the adjustable spindle is assessed under the scaffold performance standard. The adopted specification sets the required duty.
Thread profile, pitch and finished fit identify the mating pair. The selected handled nut moves through its required adjustment range and retains the bearing detail specified for that standard.
The stem position and plate plane are checked together against the assembly drawing. The specified attachment retains the plate beneath the intended stem axis.
Painted and galvanized routes have their own finished-thread requirements. The supplied nut and stem are checked in their selected finished condition, including required thread preparation or lubrication.
An existing standard and retained base-jack drawing identify the bore, thread and bearing requirements. We keep those interfaces with the complete replacement model and quantity.
The component takeoff lists each base position and selected model. Different stem/plate combinations retain their own piece counts alongside the standards and other scaffold parts.
Checks retain stem diameter, hollow wall where applicable, overall length and plate alignment against the selected assembly drawing.
The finished nut/stem pair is checked for the specified engagement and adjustment movement. The bearing face is related to the identified receiving-standard detail.
Required attachment, surface and dimensional checks stay with the complete model. Assembly count and finish identity link the inspection record to the packed lot.
Our quotation lists the complete selected model and piece count. Any separately requested nuts or plates have their own references and quantities.
Packing groups the assemblies with support and separation around projecting plates and screw stems. The selected nut arrangement stays identifiable with each complete unit.
Different stem/plate combinations are packed as distinct groups. The list retains the model, finish and complete-piece count with the agreed shipment terms.
The stem length includes its inserted and exposed portions. Usable adjustment follows the selected assembly’s minimum engagement, nut position and scaffold specification.
The stem’s complete thread designation, diameter, nut bearing face and finished-fit requirement identify the nut. A retained assembly drawing or sample keeps those details together for the replacement request.
A revised plate detail identifies the required holes, edge distances, thickness and stem attachment. The offer retains that plate revision with its complete base-jack model.
The selected component’s design or test evidence identifies the applicable loading with its adjustment and engagement conditions. Those requirements stay with the actual scaffold configuration and complete jack assembly.
Subtracting two nominal 4 mm walls from the 38 mm outside diameter gives a 30 mm geometric bore reference. The finished stem drawing supplies its actual bore, thread-root section and tolerances for the selected component.
Solid describes a stem with a filled cross-section. The material grade is a separate purchase-specification entry, retained with the stem dimensions and complete base-jack reference.
Other items in the same product category.
Send the stem/plate model or assembly drawing, receiving-standard detail, complete-unit quantities, finish and destination. Include the required engagement and adjustment specification. We quote identified base jacks and any separately listed spares.