ASSY®plus 4 CS MDF universal screw Hardened zinc plated steel partial thread countersunk head
SCR-CS-DBIT-MDF-RW20-(A2K)-4,4X40/27
Art.-no. 0178394540
EAN 4061975502766
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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, 1 bit for many screw diameters
- Compatibility with previous AW drive
Screw fitting without gaps or bulging in MDF front surfaces
- Optimisation and extension of the drill tip for screw fittings without gaps or bulging
Connection of MDF panels, hardwood or hard, engineered woods
For visually visible and plasterable wood-wood connections thanks to 90° head geometry with reduced head diameter
Maximum pull-out strength and minimum splitting effect
- Thread attuned to MDF material
- Optimum distribution of drilling chips through serrated screw core
- Prevents pressing in the MDF material due to thin core diameter and extra high thread flanks
- Do not use the screw in applications with direct exposure to the elements or in humid rooms with atmospheres containing chlorine gas. Please use ASSYplus 4 stainless steel screws for outdoor applications and rooms with constant high humidity
- 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 applications in utilisation class 1 and utilisation class 2 (from ∅ > 4 mm)
- High-quality surface protection zinc blue passivated chromium(VI)-free, up to ∅ 4 mm A2K 5 µm, from ∅ 4.5 mm A3K 8 µm layer thickness
- Suitable for use in utilisation class 1 (interior) and from ∅ > 4 mm in utilisation class 2 (wet area or covered outdoor area) according to EN 1995-1-1:2010-12 + DIN SPEC 1052-100:2013-08
- For screws from ∅ 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)
- For optimum use of the screw, the right-size RW bit must be used
- MDF partial-thread screws are ideal for connecting wooden plates in MDF. The specially tuned geometry and thread base form avoids pressing and splitting as much as possible. Due to the different MDF qualities, preliminary testing is required
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Nominal diameter (d) | 4.4 mm |
Length (l) | 40 mm |
Thread length (lg) (lg) | 27 mm |
Screw-thread length with drill tip (b) (b) | 32 mm |
Declaration of performance (EU-CPR) | Yes |
Head type | Countersunk head |
Head diameter (dh) | 7.7 mm |
Head height (k) | 2.5 mm |
Internal drive | RW20 |
Thread type | Wood screw thread |
Thread design | Partial thread |
Design | With shaft |
Thread form | Single start thread |
Core diameter | 2.3 mm |
Shape of tip | Drilling tip |
Material | Hardened steel |
Surface | Zinc plated |
Max. screw-in angle | 90 Degree |
Min. screw-in angle | 0 Degree |
Suitable for use in the following materials | Wood, Derived timber product, MDF, Chipboard, Plywood |
Area of application | Furniture, Cabinet, Store construction, Exhibition stand construction, Interior fitting, MDF-Furniture |
Approval | ETA-11/0190 |
Product weight (per item) | 2.258 g |
RoHS-compliant | Yes |
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