ASSY® 4 CSMP75 universal screw Zinc-plated steel partial thread 75° milling pocket head
ASSY 4 CSMP75 steel zn-pltd PT c/s mill. pocket RW
SCR-CSMP-WO-RW20-(A2K)-3,5X20/12
ASSY 4 CSMP
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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, 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
Easy countersinking into hard material panels and into hardwood/softwood with a high knot content
- Small 75° countersunk head and therefore narrower geometry for application in seams or close to edges
- Reduced splitting of component to be mounted when immersing the head
- High milling performance due to milling pockets integrated into the countersunk head
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 anchorage thanks to higher thread flanks
Smooth thread start ensures optimised recessing and biting of the screw
- Low risk of splitting due to displacement effect of the dome-shaped milling elements in the tip
- Friction-minimized rotation of the thread enables reduction of the screw-in force to be applied
High strength values and ductility
- A coordinated heat treatment guarantees high strength values and at the same time ensures high ductility
- We recommend using the Würth software or the corresponding design aids for planning and dimensioning your assembly. Dimensioning the ASSY screws can be carried out 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 VG 4 FT chipboard screws are optimised for use in wood and engineered woods. For applications in plastic anchors where the admissible 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
Datasheets(X)
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. This way the thread is positioned entirely in the lower component.
For applications in utilisation class 1 and 2 (from ∅ > 4 mm)
- High-quality zinc blue passivated chromium(VI)-free surface protection, up to ∅ 4 mm A2K 5 µm layer thickness, 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 of 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, use the RW bit that fits exactly
- Partial threaded screws are ideal for wood-to-wood constructions. To achieve optimum component assembly, the component thickness to be fixed must not be greater than the shank length
 | |
Nominal diameter (d) | 3.5 mm |
Length (l) | 20 mm |
Thread length (lg) | 12 mm |
Head type | Countersunk milling pocket head |
Head details | Milling pockets |
Head diameter (dh) | 7 mm |
Head height (k) | 3.0 mm |
Internal drive | RW20 |
Thread type | Wood screw thread |
Thread design | Partial thread |
Thread form | Coarse thread |
Core diameter | 2.1 mm |
Angle of the tip | 34 Degree |
Material | Hardened steel |
Surface | Zinc plated |
Colour | Silver |
Min./max. screw-in angle | 45-90 Degree |
Suitable for use in the following materials | Board ply wood (BSP), Hardwood, LVL |
Area of application | Universal, Furniture, Body, Fitting |
Suitable machines | Würth BS 14-A Combi |
Screw requiring approval | No |
RoHS-compliant | Yes |
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