ASSY® 4 A2 CS fittings screw A2 stainless steel plain full thread countersunk head
ASSY 4 A2 CS sst A2 FT countersunk head RW
SCR-CS-WO-A2-RW20-4X40/34
ASSY 4 A2 CS
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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
Form-fitting connection to metal fittings or in wooden products with high bulk density
- For fitting connection with full-thread steel screws
- Perfect fit of 90° head in fitting parts with metal countersinks
- Pulls together without head milling due to lack of milling elements below the head
- The head is inserted by pressing
Higher breaking torque
- Higher power transmission in hardwoods due to reinforced, asymmetrical thread flank geometry of the single thread
- Better anchoring thanks to higher thread flanks
Smooth thread start ensures optimised recessing and biting of the screw
- Reduced splitting effect due to displacement effect of the dome-shaped milling elements in the tip
- Friction-reduced thread rotation allows reduction of the screw-in force to be 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 rural or urban environments or industrial atmospheres without significant exposure to chlorides or SO2
- With friction-reducing slide coating for easy fastening
ETA-11/0190 approved
- 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. Use the Würth timber construction software for dimensioning of ASSY screws from a diameter 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 (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
Datasheets(X)
For steel-wood connections designed for tensile forces
The full thread starting immediately below the head allows for e.g. fitting-wood or sheet material-wood connections designed for tensile forces with high load-bearing capacity. Greater screw pull-out force is achieved by the maximum thread length.
Can be used for outdoor applications and utilisation class 3
- ASSY screws are approved for quasi-static loads
- For optimum use of the screw, the right-size RW bit must be used
- Full-thread screws are suitable for secure mounting of fittings or thin materials. The screw length to be selected should be less than the plate thickness of substrate the screw is to be driven in
- If countersunk head screws are used for a metal-to-wood mounting, the metal to be connected must be provided with suitable countersunk holes
 | |
Nominal diameter (d) | 4 mm |
Length (l) | 40 mm |
Head type | Countersunk head |
Head diameter (dh) | 8 mm |
Head height (k) | 2.5 mm |
Internal drive | RW20 |
Thread type | Wood screw thread |
Thread design | Full thread |
Thread form | Single start thread |
Thread length (lg) | 34 mm |
Core diameter | 2.5 mm |
Shape of tip | Tip with hilltop milling cutter |
Angle of the tip | 28 Degree |
Material | Stainless steel A2 |
Surface | Plain |
Min./max. screw-in angle | 0-90 Degree |
Product weight (per item) | 2.202 g |
Suitable for use in the following materials | Board ply wood (BSP), Hardwood, LVL |
Area of application | Façades, Terrace, Fence, Structural woodwork, Wet areas, Balcony, Board walk, Play equipment, Outdoors |
Suitable machines | Würth BS 12-A Power, Würth BS 14-A Combi |
Approval | ETA-11/0190 |
Screw requiring approval | Yes |
RoHS-compliant | Yes |
| Minimum clearances for non-pre-drilled screws in wooden components ρk ≤ 420 kg/m3 | ||||||||||||||||
| Screw diameter | Male thread diameter in mm | Screw diameter | Male thread diameter in mm | |||||||||||||
| Dia. 3 to 4.5 mm | Dia. 5 to 14 mm | 3 | 3,5 | 4 | 4,5 | 5 | 6 | Dia. 3 to 4.5 mm | Dia. 5 to 14 mm | 3 | 3,5 | 4 | 4,5 | 5 | 6 | |
| a1 | 10 x d | 12 x d | 30 | 35 | 40 | 45 | 60 | 72 | 5 x d | 5 x d | 15 | 18 | 20 | 23 | 25 | 30 |
| a2 | 5 x d | 5 x d | 15 | 17,5 | 20 | 22,5 | 25 | 30 | 5 x d | 5 x d | 15 | 18 | 20 | 23 | 25 | 30 |
| a3,t | 15 x d | 15 x d | 45 | 52,5 | 60 | 67,5 | 75 | 90 | 10 x d | 10 x d | 30 | 35 | 40 | 45 | 50 | 60 |
| a3,c | 10 x d | 10 x d | 30 | 35 | 40 | 45 | 50 | 60 | 10 x d | 10 x d | 30 | 35 | 40 | 45 | 50 | 60 |
| a4,t | 5 x d | 5 x d | 15 | 17,5 | 20 | 22,5 | 25 | 30 | 7 x d | 10 x d | 21 | 25 | 28 | 32 | 50 | 60 |
| a4,c | 5 x d | 5 x d | 15 | 17,5 | 20 | 22,5 | 25 | 30 | 5 x d | 5 x d | 15 | 18 | 20 | 23 | 25 | 30 |
| 1) The minimum clearances are specified in accordance with DIN EN 1995-1-1 tab. 8.2 for non-pre-drilled nail holes, where d is the male thread diameter | ||||||||||||||||
| 2) The minimum distances between 0° < α < 90° force to the direction of the grain can be calculated more precisely in accordance with DIN EN 1995-1-1 tab. 8.2 | ||||||||||||||||
| Bracket between force and grain direction α = 0° | Bracket between force and grain direction α = 90° |
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