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ASSY® 4 A2 TH universal screw Plain A2 stainless steel, partial thread, top head
Partial-thread screw made of high-quality austenitic A2 stainless steel with top head for universal wood-to-wood fastening in outdoor areas exposed to weathering
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RW recess ensures optimal power transmission
- Larger contact surface at the bit offers increased power
- 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 multiple screw diameters
- Compatibility with previous AW recess
Visually appealing, unobtrusive fastening of narrow wooden components
- Small screw head with lens-shaped rounded head for visually appealing, unobtrusive fastening
- Highly effective milling ribs prevent narrow wooden profiles from splitting
Higher breaking torque
- Higher power transmission in compact and hard woods due to single-start thread with reinforced, asymmetrical thread flank geometry
- Better anchorage due to higher thread flanks
Smooth thread start ensures optimised piercing and engaging 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
Stainless use for accessible timber 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 has limited resistance to acid and is 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 a reduction in the admissible load may occur, only use 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 in accordance with ETA-11/0190
The requirements of the European Technical Approval (ETA) must be observed
For wood-to-wood connections designed to be joined tightly
The partial thread starting immediately below the shank allows for wood-to-wood connections designed to be joined 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 timber components. To ensure the components are optimally joined, the components must not be thicker than the length of the screw shank
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