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ASSY® 4 A2 TH universal screw A2 stainless steel, black, partial thread, top head
Partial-thread screw made of high-quality austenitic A2 stainless steel with top head for universal wood-wood fastening in outdoor areas exposed to weathering
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Ideal power transmission thanks to RW recess
- More power thanks 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
Well-designed, unobtrusive mounting of narrow wooden components
- Small screw head with lens-shaped rounded head for well-designed, unobtrusive mounting
- Highly effective milling ribs prevent narrow wooden profiles from splitting
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 piercing and biting of the screw
- Minimal splitting thanks 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
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 anti-friction 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 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
- ASSY 4, ASSYplus 4 and ASSYplus 4 VG chipboard screws are optimised for use in wood and engineered wood. 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
Approved as per ETA-11/0190
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 component.
Can be used for outdoor applications and utilisation class 3
- To increase the joining effect or head penetration resistance, we recommend using the product in conjunction with precisely fitting washers for ASSY 4
- ASSY screws are approved for quasi-static loads
- For optimal use of the screw, use the RW bit that fits exactly
- Partial thread screws are ideal for connecting wooden components. To achieve optimal component assembly, the thickness of the component to be joined tightly must not be greater than the shank length
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