ASSY® 4 BP rear panel screw Steel zinc plated full thread back panel head
ASSY 4 BP steel zinc plated FT rear wall head RW
SCR-BCKPAN-RW20-(A2K)-4X35/32
ASSY 4 BP
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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
Powerful connection of e.g. thin fibreboards for furniture back panels
- Large flat-shaped washer head for a strong connection of e.g. thin fibreboards in furniture back panels
- Visually appealing flat screw connection
- Large head diameter with small thread diameter for a strong connection
No over-tightening or stripping and high feed
- Higher power transmission in hardwoods due to reinforced, asymmetrical thread flank geometry of the coarse 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
- 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
- Do not use the screw in applications with direct exposure to the elements or in humid rooms with atmospheres containing chlorine gas. If used outdoors and in rooms that are constantly exposed to high humidity, please use ASSY 4 A2 combi stainless steel screws
- 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 pull-out forces and for fastening thin plate materials
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.
For applications in utilisation class 1 and utilisation class 2 (from ∅ > 4 mm)
- High-quality surface protection, zinc, blue-passivated chromium(VI)-free 5 µm layer thickness
- Suitable for use in utilisation class 1 (interior) and from a ∅ > 4 mm in utilisation class 2 (covered outdoor area) according to EN 1995-1-1:2010-12 + DIN SPEC 1052-100:2013-08
- 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
 | |
Material | Hardened steel |
Surface | Zinc plated |
Nominal diameter (d) | 4 mm |
Length (l) | 35 mm |
Thread length (lg) | 32 mm |
Head diameter (dh) | 9.4 mm |
Head height (k) | 1.8 mm |
Internal drive | RW20 |
Approval | ETA-11/0190 |
Suitable for use in the following materials | Board ply wood (BSP), Wood, Derived timber product, Hardwood, LVL, Softwood |
Area of application | Furniture, Body, Back board |
Head type | Rear wall head |
Core diameter | 2.5 mm |
Thread type | Wood screw thread |
Thread design | Full thread |
Thread form | Coarse thread |
Shape of tip | Tip with hilltop milling cutter |
Max. screw-in angle | 90 Degree |
Min. screw-in angle | 0 Degree |
RoHS-compliant | Yes |
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