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ASSYplus VG 4 CH construction screw Steel zinc plated full thread cylinder head
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ASSYplus VG 4 CH construction screw Steel zinc plated full thread cylinder head
Special full-thread screw with small cheese head for high-load-bearing wood-to-wood connections or reinforcements in structural timber construction, which also require small edge and screw clearances, in dry indoor or humid areas.
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Exclusively for trade customers
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Ideal power transmission thanks to RW drive
- More power due to larger contact area at the bit
- More stability, one-handed working, precise positioning due to the tight-fit recess and perfect fit of the bit
- Fewer bit changes, one bit for many screw diameters
- Compatibility with previous AW drive
Unobtrusive mounting of wooden components
- Small head diameter for unobtrusive mounting
- Low splitting effect when countersinking the screw head
Highest power transmission in the tensile and compressive direction
- Symmetrical high-performance thread matched to the pre-drilling performance of the drill bit tip
- For high-load wood/wood connections regardless of the load direction
Compact screw connections and small material cross-sections due to effective drill bit tip
- Extremely short permitted edge distances e.g. 3xd, making ASSY screws ∅ 8 mm usable for beam widths 60 mm
- No pre-drilling required
- The wood does not split and rupture
- Little run-off of long screws
High strength values and ductility
- Adjusted heat treatment guarantees high strength values and high ductility
Proof of Performance
Approved according to ETA-11/0190, for wood-concrete composite ceilings ETA-13/0029
Notice
- We recommend using the Würth software or corresponding design aids for planning and designing your installation. Dimensioning of ASSY screws can be carried out in the Würth timber construction software from a screw dia. of 5 mm
- Do not use the screw in applications with direct exposure to weathering or in humid rooms with atmospheres containing chlorine gas
- ASSY 4, ASSYplus 4 and ASSYplus 4 VG chipboard screws are optimised for use in timber and engineered woods. For applications in plastic fixings where the load can also be reduced, use only screws without an optimised thread tip (tip with milling ribs, drill tip, self-clearing groove etc.), such as the ASSY D screws with countersunk head or pan head
Application area
| Instructions | |||
| Notches and openings | |||
 | Until now, it has been necessary to create reinforcements in order to prevent the failure of support beams, for example by using glued-on wooden material panels or glued-in threaded rods. The full-thread screw ASSY plus VG provides a quick, and above all invisible, alternative to this. |  | |
 |  | Timber-concrete composite floor Floor renovation employing a wood and concrete composite is the optimum method for increasing the load-bearing capacity where the beam spacings and support widths are particularly great, or where there are very high rated loads. Here, partly screwed-in full-thread screws serve as shear connectors and absorb the shear flow between the wooden beams and concrete slab. This eliminates the time-consuming installation of shear connectors made from expanded metal. ASSY plus VG has its own construction product approval (Z-9.1-648) for this method. Project-related calculations with static verification can be carried out with the "technical software 6.0". | |
| Main/secondary support beam connection | |||
 |  | Until now, main/secondary support beam connections had been made with sheet metal parts, such as joist hangers. The ASSYplus VG screw provides a time-saving and invisible alternative. By screwing in the ASSYplus VG at an angle of 45°, the screws absorb the lateral forces of the connection. Ideal for application: Setting template VG-Fix | |
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| Rafter-purlin connection | |||
 | Conventional rafter-purlin anchors require time-consuming assembly and also have a low load-bearing capacity. The ASSYplus VG therefore represents an efficient alternative. The typical weak point of a standard countersunk head screw, head pull-through, is eliminated by the ASSYplus VG. |  | |
| Coupling purlins | |||
 | In the construction of commercial and industrial buildings, the rafter-supporting purlins are generally formed as coupling purlins. The coupling is used to achieve more favourable wood cross-sections than with single-field beams. This new connection type saves time and money in joining and mounting. For each connection point, one ASSY SK screw is screwed in, and depending on the load, ASSY plus VG screws are screwed in at right angles. There is then no need for predrilling. The wood cross-sections can be kept small due to the short edge distances. The complex milling out of the anchors is then eliminated. Only one powerful cordless drill is required for installation. The purlins can be cut to length by the saw mill and delivered directly to the construction site. The purlins are pulled together with the ASSY SK washer head screw. No additional clamping tools are required. Dimensioning tables were prepared for the static calculation of the connections, which can be requested via the Würth salesperson. |  | |
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| False edge and lateral support beam reinforcement | |||
 | It is often necessary to reinforce existing beams, especially when renovating old buildings. With the reinforcement types of false edge and lateral support beam reinforcement, the ASSY plus VG screw offers effective, cost-efficient technologies for increasing load-bearing capacity of the beams and reducing bending. |  | |
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Approved according to ETA-11/0190, for wood-concrete composite ceilings ETA-13/0029
The requirements of the European Technical Approval (ETA) must be observed
Application area
For connections with high tensile or compressive pull-out loads and exposed wood-wood connections in structural wood construction
For applications in utilisation class 1 and 2 (from diameter > 4 mm)
- High-quality surface protection, zinc, blue-passivated chromium(VI)-free 8 µm layer thickness
- Suitable for use in utilisation class 1 (interior) and from diameter > 4 mm in utilisation class 2 (wet area or covered outdoor area) according to EN 1995-1-1:2010-12 + DIN SPEC 1052-100:2013-08
- The requirement of classification T2/C2 is fulfilled in accordance with prEN 14592:2017 (D)
Instructions
- ASSY screws are approved for quasi-static loads.
- For optimum use of the screw, use the RW bit that fits exactly.
- In the case of shear reinforcements, a pressure distribution plate must be inserted between the support point and screw heads. The screw head must be flush with the pressure distribution plate. Full-thread screws with countersunk head are preferable. The steel plate thickness must be dimensioned in such a way that a uniform load distribution on the screws is guaranteed.
- At least two screws must be used for the reinforcement of wooden components at a right angle to the fibre under effect of tensile action. If the length of thread engagement is at least 20 x d above and below the crack-prone area, with d being the outer thread diameter of the screw, only one screw may be used.
- Full-thread screws are suitable for reinforcing and creating high load-bearing connections between two components. Components should be fastened without any gap.
- For long screws arranged in a cross shape or in a screw block with narrow edge distances, it is advisable to drill pilot holes or use a screw-in aid to avoid contact with screws.
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