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ASSY® 4 A2 WH washer head screw A2 stainless steel plain partial thread washer head
Partially threaded screw made of high-quality austenitic A2 stainless steel with large washer head for wood-wood fastening in outdoor areas exposed to the elements
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Ideal power transmission thanks to RW recess
- 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, 1 bit for many screw diameters
- Compatibility with previous AW drive
Well-designed screw connection lying against the wood
- Very high head penetration values and tight joining of two wooden components due to the large head diameter
Higher breaking torque
- Higher power transmission in hardwoods due to reinforced, asymmetrical thread flank geometry of the single-start thread
- Better anchorage thanks to higher thread flanks
Smooth thread start ensures optimised recessing and biting of the screw
- Reduced splitting thanks to displacement effect of the dome-shaped milling elements in the tip
- Reduced-friction thread rotation allows reduction of the screw-in force that is applied
Stainless mounting for accessible wood connections in outdoor areas exposed to weathering
- Made of austenitic, non-magnetic and non-rusting A2 stainless steel
- Can be used in a rural or urban environment or in an industrial atmosphere without significant exposure to chlorides or SO2
- With friction-reducing slide coating for easy screwing
- Austenitic stainless steel is characterised by a high degree of corrosion resistance against aggressive industrial air, sea air, tap water, river water, mine water and salt water, as well as woods containing tannic acid. It is resistant to acid to a certain extent and not suitable for atmospheres containing chlorine gas
- We recommend using the Würth software or the corresponding design aids for planning and dimensioning your assembly. Dimensioning the ASSY screws can be carried out in the Würth timber construction software from a diameter of 5 mm
- 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 admissible 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
ETA-11/0190 approved
The requirements of the European Technical Approval (ETA) must be observed
For wood-to-wood connections designed to join tightly
The partial thread starting immediately below the shank allows for wood-to-wood connections designed to join tightly. In this case the thread is positioned entirely in the lower second component.
Can be used for outdoor applications and utilisation class 3
- ASSY screws are approved for quasi-static loads
- For optimum use of the screw, use the RW bit that fits exactly
- Partial threaded screws are ideal for connecting wooden components. To achieve optimum component assembly, the component thickness to be joined tightly must not be greater than the shank length
- For long screws arranged in a cross shape or in a screw block with narrow margins, it is advisable to drill pilot holes or use a screw-in aid to avoid contact with screws
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