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ASSY® 4 CSMR double-start thread Steel zinc-plated partial thread countersunk milling head
Special partial thread screw with ribbed countersunk head with milling pockets for fastening of particleboard flooring in indoor dry or wet areas
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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
Easy countersinking in hard wood/soft wood with high knot content as well as hard wood fibreboards
- Very high milling performance due to milling ribs located at the countersunk head
No over-tightening or stripping and high feed
- Higher power transmission in hard woods due to reinforced, asymmetrical thread flank geometry of the double-start thread
- Better anchoring thanks to higher thread flanks
Ideal for friction-free screw fitting in plastic, such as in dowels or in homogeneous highly compressed wooden materials
- Screw bites rapidly through the continuous thread design to the tip of the screw
- Non-spreading screwing in thanks to tip geometry without any component to reduce splitting
- We recommend using the Würth software or the corresponding design aids for planning and dimensioning your assembly. ASSY screws can be dimensioned in the Würth timber construction software from a ∅ 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 or A4 stainless steel screws and, if atmosphere is chlorine-containing, HCR 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
For wood-to-wood connections designed to pull together
The partial thread starting immediately below the shank allows for wood-to-wood connections designed to pull together. The thread in this case is positioned entirely in the lower second component.
For applications in utilisation class 1 and 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)
- ASSY screws are approved for quasi-static loads
- For optimum use of the screw, the right sized RW bit must be used
- Full-thread screws are suitable for reinforcing and creating high load-bearing connections of two components. Components should be connected without any gap
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