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ASSY® 4 chipboard screws countersunk head assortment Zinc-plated steel, full and partial thread, countersunk head, 742 pieces in system case
742 pieces in system case 4.4.1. ASSY® 4 chipboard screws, countersunk head, RW recess, zinc-plated steel, blue passivated (A2K)
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Variants
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Ideal power transmission due to RW recess
- More power due to a larger contact surface at the bit
- More stability, one-handed working and 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
Mechanically interlocking connection to metal fittings or in wood products with high bulk density
- For connecting fittings with full-thread steel screws
- Perfect fit of 90° head in fittings with metal countersinks
- Tight joint without countersinking as the screw head does not have any milling elements
- The head is countersunk by pressing
No over-tightening with high feed performance
- Higher power transmission in compact and hard woods due to reinforced, asymmetrical flank geometry of the coarse thread
- Better anchorage due to higher thread flanks
Smooth thread start ensures optimised piercing and biting of the screw
- Minimal splitting due to material displacement by the dome-shaped milling elements in the tip
- Minimal friction when screwing in the thread reduces the amount of force required
- We recommend using the Würth software or the corresponding design aids for planning and designing your assembly. Designing the ASSY screws can be carried out in the Würth timber construction software from a diameter of 5 mm
- Do not use the screw in applications with direct exposure to the elements or in humid rooms with atmospheres containing chlorine gas. If used outdoors and in rooms that are constantly exposed to high humidity, please use ASSY 4 A2 or A4 stainless steel screws and, if the atmosphere contains chlorine, HCR stainless steel screws
- ASSY 4, ASSYplus 4 and ASSYplus 4 VG chipboard screws are optimised for use in wood and engineered woods. For applications in plastic anchors 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
For steel-wood connections designed for tensile forces
The full thread starting immediately below the head allows for e.g. a highly load-bearing fitting/wood or plate material/wood connection designed for tensile forces. An increased screw pull-out force is achieved by the maximum thread length.
For applications in utilisation class 1 and 2 (from dia. > 4 mm)
- High-quality surface protection, zinc, blue-passivated chromium(VI)-free 5 µm layer thickness
- Suitable for use in utilisation class 1 (interior) and from dia. > 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
- ASSY screws are approved for quasi-static loads
- For optimum use of the screw, use the RW bit that fits exactly
- Full-thread screws are suitable for secure fastening of metal fittings or thin materials. Select a screw length that is less than the plate thickness of the screw surface
Select RAL-colour code
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