ASSY® 4 PII CSMP universal screw Steel zinc-plated partial thread with underhead thread milling pocket head
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ASSY® 4 PII CSMP universal screw Steel zinc-plated partial thread with underhead thread milling pocket head
Special partial thread screw with underhead thread with tightening effect for flat, close-to-edge and high-load-bearing wood-wood and steel-wood connections with no gap in interior finishing or timber construction in dry indoor areas or damp areas
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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 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
Innovative underhead thread
- Very high head pull-through (> ASSY 4 WH) due to supporting underhead thread and increased head diameter
- Gap-free assembly is ensured by the opposite grooved shank applying pressure and the underhead thread with a smaller pitch, tightening effect approx. 2 mm
- Suitable for wood-wood and steel-wood connections due to 90° countersunk head and identical outer diameter of both threads
- Two wooden elements can be precisely joined thanks to the head fitting flush with the wood surface
Very easy to install
- Improved head countersinking and reduced risk of head breakage in hard wood surfaces (knotted areas) due to more uniform distribution of tension between head and underhead thread
- Simplifies assembly and reduces the range of screws that need to be kept on assembly vehicles by combining the characteristics of countersunk head screws and washer head screws
- Optimised grooving and biting of the screw due to gentle thread start
- Low gap effect due to displacement effect of the dome-shaped milling elements in the tip
Proof of Performance
Approved as per ETA-11/0190
Notice
- We recommend using the Würth software or corresponding design aids for planning and designing your installation. Dimensioning the ASSY screws can be carried out in the Würth timber construction software from a ∅ 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
Application area
| Steel zinc-plated, utilisation class 1 and 2, draft 22/11/2023 |  | Characteristic load capacities of the connector | Fax,Rk | Fv,Rk |  |  |  |  | Dimensions | Art. no. | PU | ls | t1,min | t1,max,90/90 | t1,max,90/0 | 90°/90° | 90°/0° | 90°/90° | 90°/0° | Unit | mm | mm | mm | mm | kN | kN | kN | kN | ASSY 4 PII CSMP |
| Screwing and press gluing, thread length required lg =15xd | ||||||||||
| Key | General | |||||||||
| Component 1 (screw head) | Design value for load capacity | |||||||||
| Component 2 (screw tip) | ||||||||||
| Component thickness t2 ≥ls - t1 characteristic raw density ρk = 350 kg/m³ | ||||||||||
| 8x70/32 | 0190 440 807 | 50 | 70 | 32 | 38 | --- | 2,82 | --- | 2,50 | --- |
| 8x80/32 | 0190 440 808 | 50 | 80 | 32 | 48 | --- | 2,82 | --- | 2,75 | --- |
| 8x90/32 | 0190 440 809 | 50 | 90 | 32 | 58 | --- | 2,82 | --- | 2,75 | --- |
| 8x110/50 | 0190 440 811 | 50 | 110 | 32 | 60 | --- | 4,40 | --- | 3,15 | --- |
| 8x130/60 | 0190 440 813 | 50 | 130 | 32 | 70 | --- | 5,28 | --- | 3,37 | --- |
| 8x150/80 | 0190 440 815 | 50 | 150 | 32 | 70 | --- | 7,04 | --- | 3,81 | --- |
| 8x170/80 | 0190 440 817 | 50 | 170 | 32 | 90 | --- | 7,04 | --- | 3,81 | --- |
| 8x190/80 | 0190 440 819 | 50 | 190 | 42 | 110 | --- | 7,04 | --- | 3,81 | --- |
| 8x210/100 | 0190 440 821 | 50 | 210 | 42 | 110 | 50 | 7,87 | 2,64 | 4,31 | 2,55 |
| 8x230/100 | 0190 440 823 | 50 | 230 | 42 | 130 | 70 | 7,87 | 2,64 | 4,31 | 2,55 |
| 8x250/100 | 0190 440 825 | 50 | 250 | 42 | 150 | 90 | 7,87 | 2,64 | 4,31 | 2,55 |
| 8x270/100 | 0190 440 827 | 50 | 270 | 42 | 170 | 110 | 7,87 | 2,64 | 4,31 | 2,55 |
| 8x290/100 | 0190 440 829 | 50 | 290 | 42 | 190 | 130 | 7,87 | 2,64 | 4,31 | 2,55 |
| 8x310/100 | 0190 440 831 | 50 | 310 | 42 | 210 | 150 | 7,87 | 2,64 | 4,31 | 2,55 |
| 8x330/100 | 0190 440 833 | 50 | 330 | 42 | 230 | 170 | 7,87 | 2,64 | 4,31 | 2,55 |
| 8x350/100 | 0190 440 835 | 50 | 350 | 42 | 250 | 190 | 7,87 | 2,64 | 4,31 | 2,55 |
| 8x370/100 | 0190 440 837 | 50 | 370 | 42 | 270 | 210 | 7,87 | 2,64 | 4,31 | 2,55 |
| 8x210/120 | 0190 440 921 | 50 | 210 | 42 | 70 | 50 | 7,87 | 3,17 | 4,31 | 2,55 |
| 8x270/120 | 0190 440 927 | 50 | 270 | 42 | 150 | 110 | 7,87 | 3,17 | 4,31 | 2,55 |
| 8x330/120 | 0190 440 933 | 50 | 330 | 42 | 210 | 170 | 7,87 | 3,17 | 4,31 | 2,55 |
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| Component thickness t1,min ≤t1 ≤t1,max characteristic raw density ρk = 350 kg/m³ | Fax,Rd = kmod · Fax,Rk/ϒM Fv,Rd = kmod · Fv,Rk/ϒM | |||||||||
Approved as per ETA-11/0190
The requirements of the European Technical Approval (ETA) must be observed
Application area
- For connecting two hardened wooden elements that fit exactly without leaving a gap, in particular for structural timber constructions or load-bearing purposes.
- Screws with a diameter of 8 mm and a thread length of 120 mm (15xd) are ideal for screwing and press gluing.
- The underhead thread has a reduced thread pitch and enlarged external diameter and allows two wooden elements to be connected without leaving a gap.
- For applications where a flat finish of the screw head with the wood surface is required.
For applications in utilisation classes 1 and 2 (from dia. > 4 mm)
- High-quality surface protection zinc blue-passivated chromium(VI)-free, A3K 8 µm layer thickness
- Suitable for use in utilisation class 1 (indoor areas) and from dia. > 4 mm in utilisation class 2 (wet areas or covered outdoor areas) in accordance with EN 1995-1-1:2010-12 + DIN SPEC 1052-100:2013-08
- For screws from dia. 4.5 mm with zinc layer thickness 8 µm with Cr(III) passivation, the requirement of classification T2/C2 is fulfilled in accordance with prEN 14592:2017 (D)
Instructions
- The maximum gap between the components to be joined must not exceed 2 mm
- ASSY screws are approved for quasi-static loads
- For optimal use of the screw, use the RW bit that fits exactly
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