ASSY® 4 CS BLACK fittings screw Zinc-nickel-plated black full thread countersunk head
ASSY 4 CS ZINI stl zn-nickel-pl. blck FT c/s hd RW
SCR-CS-WO-RW20-(P2R)-4X20/16
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Ideal power transmission due to RW recess
- More power due to a larger contact surface 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
Mechanically interlocking connection to metal fittings or in wood products with high bulk density
- For connecting fittings with full-thread steel screws
- Perfect fit of 90° head in fittings with metal countersinks
- Tight joint without countersinking as the screw head does not have any milling elements
- The head is inserted by pressing
No over-tightening with high feed performance
- Higher power transmission in compact and hard woods due to reinforced, asymmetrical flank geometry of the coarse thread
- Better anchorage due to higher thread flanks
Smooth thread start ensures optimised piercing and biting 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
- We recommend using the Würth software or corresponding design aids for planning and designing your installation. Design of ASSY screws can be carried out in the Würth timber construction software from a screw dia. of 5 mm
- Do not use the screw in applications with direct exposure to the weather or in wet rooms with atmospheres containing chlorine gas. If used outdoors and in rooms that are constantly exposed to high humidity, please use ASSY 4 A2 or A4 stainless steel screws and, if the atmosphere contains chlorine, use HCR stainless steel screws
- ASSY 4, ASSYplus 4 and ASSYplus 4 VG chipboard screws are optimised for use in timber 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
Approved as per ETA-11/0190
The requirements of the European Technical Approval (ETA) must be observed
Datasheets(X)
For steel-to-wood connections designed for withstanding large pull-out forces
The full thread starting immediately below the head enables a high load-bearing connection designed for withstanding large pull-out forces, e.g. hardware-to-wood or plywood-to-wood connection. The maximised thread length increases the force required to pull out the screw.
For applications in utilisation classes 1 and 2 (from dia. > 4 mm)
- High-quality surface protection, zinc-nickel-plated, black, chromium(VI)-free
- 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
- ASSY screws are approved for quasistatic loads
- For optimal use of the screw, use the RW bit that fits exactly
- Full-thread screws are suitable for secure fastening of metal fittings or thin materials. Select a screw length that is less than the panel thickness of the base material
 | |
Nominal diameter (d) | 4 mm |
Length (l) | 20 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 | Coarse thread |
Thread length (lg) | 16 mm |
Core diameter | 2.5 mm |
Shape of tip | Tip with hilltop milling cutter |
Angle of the tip | 34 Degree |
Material | Steel |
Surface | Zinc nickel black |
Min./max. screw-in angle | 0-90 Degree |
Product weight (per item) | 1.220 g |
Suitable for use in the following materials | Wood, Derived timber product, Softwood, Board ply wood (BSP), Hardwood, LVL |
Area of application | Universal, Furniture, Cabinet, Fitting |
Suitable machines | Würth BS 12-A Power |
Approval | ETA-11/0190 |
Screw requiring approval | Yes |
RoHS-compliant | Yes |
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