Adjustable fork-head assemblies with solid or hollow screw stems
Our U-head jacks combine an open beam-support head, threaded stem and matched adjustment nut. The catalog lists solid and hollow models with their own head-plate dimensions and complete-unit weights. We supply these independent top-support assemblies by selected model, with the beam seat and receiving-standard interface retained on the drawing.
| Upper seat | Head plate and two side cheeks around the supported beam |
|---|---|
| Head dimensions | Plate envelope, cheek height, thickness and finished clear opening |
| Stem | Selected solid screw or threaded hollow tube |
| Adjustment nut | Mating thread and receiving-standard bearing face |
| Lower interface | Stem insertion, usable adjustment and standard bore |
| Finish | Painted, electro-galvanized or hot-dip galvanized route |
Selected complete units from our factory screw-jack catalog. The catalog head-plate dimensions are retained with their corresponding stems and listed masses.
| Stem form | Stem dimensions (mm) | Catalog head-plate dimensions (mm) | Listed unit mass (kg) |
|---|---|---|---|
| Solid | 30 × 400 | 150 × 150 × 50 × 4 | 3.35 |
| Solid | 30 × 600 | 150 × 120 × 50 × 4 | 4.08 |
| Solid | 34 × 400 | 105 × 100 × 50 × 4 | 3.44 |
| Solid | 34 × 600 | 150 × 120 × 50 × 4 | 5.01 |
| Hollow | 38 × 4 × 600 | 150 × 150 × 50 × 5 | 3.99 |
| Hollow | 38 × 4 × 660 | 170 × 150 × 80 × 6 | 5.04 |
| Hollow | 48 × 4 × 600 | 150 × 150 × 50 × 8 | 5.23 |
| Hollow | 48 × 4 × 900 | 200 × 200 × 50 × 8 | 8.68 |
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Factory catalog complete U-head jack references. Solid stems use diameter × length; hollow stems use OD × wall × length. The selected drawing establishes the finished clear seat, plate orientation, thread/nut fit and applicable adjustment/loading requirements.
The support detail identifies the beam or member stack and its bearing footprint on the head. The plate and cheek arrangement retain the beam orientation and required clearances.
Stem diameter, bore insertion and the nut bearing surface are selected for the receiving standard. Solid and hollow units retain their own complete component specification.
The accepted support detail gives the permitted exposed setting and minimum engagement. Those dimensions establish the complete head’s working position relative to the supporting standard.
A head with a means of limited vertical adjustment is assessed under EN 12811-1, the performance standard for access and working scaffolds; EN 74-3 covers plain base plates and loose spigots. Falsework erected to EN 12812 carries its own requirements. The adopted specification sets the duty.
The drawing locates the finished inside faces of both cheeks and the beam’s bearing surface. Those datums establish clearance for the supported member and its required placement.
The stem axis and U-head orientation are related on the complete assembly drawing. The selected attachment and plate planes keep the bearing seat in its intended position.
The handled nut and stem retain their matched thread profile and selected finish. Movement and engagement checks use the completed parts, including required thread preparation or lubrication.
A retained U-head drawing, beam-seat requirement and receiving-standard reference identify the replacement assembly. The model keeps all three interfaces together under one part reference.
The support schedule lists top-head positions and complete-unit quantities. Different head plates or stem models remain separate entries beside the tower and beam components.
The catalog head-plate dimensions, cheek planes and finished internal opening are checked against the selected head drawing. The bearing seat and stem axis share their specified datums.
The finished nut moves over its required range with the specified engagement. The receiving-standard detail establishes the corresponding bore and bearing contact.
Required attachment and finish checks stay linked to the assembly model. The record identifies the supplied stem, head and complete-piece quantity.
Our offer identifies the selected head plate, stem, nut, finish and number of complete U-head units. Separately requested components retain their own quantities.
Packing supports the assemblies while providing clearance for projecting cheeks and threaded stems. Nut and model identities remain visible within the grouped parts.
Each different head/stem configuration has its own packing group. The list retains the complete model reference and the agreed shipment basis.
The selected drawing gives the clear opening between the finished cheek faces. That dimension is checked with the supported beam or member stack and its required placement clearance.
The accepted support design identifies the intended beam arrangement and bearing footprint. The selected head detail then retains its clear seat, cheek configuration and loading requirements for that arrangement.
A telescopic prop head follows its prop attachment and assembled-height detail. An independent screw U-head follows its own stem, nut and receiving-standard interface; the order identifies which complete component is required.
The support detail identifies the beam-bearing plane relative to the receiving standard and the permitted adjustment setting. The head geometry, inserted stem and nut position all enter that assembled height.
The lower-flange width and required seat length identify the beam’s contact footprint. Its installed orientation, bearing location and access between the side cheeks remain on the support detail, alongside the complete I-section reference.
A through-tie arrangement is detailed with a continuous opening through the head seat and stem. The component drawing identifies the opening diameter, position and tie-bearing arrangement together with the head and spindle sections required for that support.
Other items in the same product category.
Send the head/stem model or drawing, clear beam-seat requirement, receiving-standard detail, unit quantities, finish and destination. We quote the complete U-head configuration and any separately listed components.