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ASSY® 4 A2 CSMR hardwood universal screw A2 stainless steel plain, partial thread, countersunk milling head
Partial-thread screw made of high-quality austenitic A2 stainless steel with countersunk milling head for universal wood-wood fastening in outdoor areas exposed to the elements
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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
Easy countersinking in hardwood/softwood with high knot content as well as hard wood fibreboards
- Very high milling performance due to milling ribs located at the countersunk head
No over-tightening or stripping and high feed
- Higher power transmission in hard woods due to reinforced, asymmetrical thread flank geometry of the coarse thread
- Better anchoring thanks to higher thread flanks
Ideal for friction-free screw fitting in plastic, such as in dowels or in homogeneous highly compressed wooden materials
- Screw bites rapidly through the continuous thread design to the tip of the screw
- Non-spreading screwing in thanks to tip geometry without any component to reduce splitting
- 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. ASSY screws can be dimensioned in the Würth timber construction software from a ∅ of 5 mm
- ASSY 4, ASSYplus 4 and ASSYplus 4 FT chipboard screws are optimised for use in wood and wood materials. For applications in plastic anchors where load capacity can also be reduced, use only screws without an optimised thread tip (coupling cutter tip, drill bit tip, self-clearing groove etc.), such as the ASSY D screws with countersunk head or pan head
For wood to wood connections designed to pull together
The partial thread starting immediately below the shank allows for wood to wood connections designed to pull together. The screw thread is positioned entirely in the lower component once screwed in.
Can be used for outdoor applications and utilisation class 3
- To increase the joining effect or head pull-through resistance, combining with perfectly fitting washers for ASSY 4 is recommended
- ASSY screws are approved for quasi-static loads
- For optimum use of the screw, the right-size RW bit must be used
- Partial-thread screws are ideal for connecting wooden components. To achieve optimum assembly of the components, the components to be fixed must not be thicker than the length of the shank
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