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ASSY® 4 PII CSMP universal screw Steel zinc-plated partial thread with underhead thread milling pocket head
ASSY<SUP>®</SUP> 4 PII CSMP universal screw Steel zinc-plated partial thread with underhead thread milling pocket head - 18
ASSY<SUP>®</SUP> 4 PII CSMP universal screw Steel zinc-plated partial thread with underhead thread milling pocket head - 1
ASSY<SUP>®</SUP> 4 PII CSMP universal screw Steel zinc-plated partial thread with underhead thread milling pocket head - 2

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ASSY® 4 PII CSMP universal screw Steel zinc-plated partial thread with underhead thread milling pocket head

Special partial thread screw with underhead thread with tightening effect for flat, close-to-edge and high-load-bearing wood-wood and steel-wood connections with no gap in interior finishing or timber construction in dry indoor areas or damp areas

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Available in 19 versions

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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 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


Innovative underhead thread


  • Very high head pull-through (> ASSY 4 WH) due to supporting underhead thread and increased head diameter

  • Gap-free assembly is ensured by the opposite grooved shank applying pressure and the underhead thread with a smaller pitch, tightening effect approx. 2 mm

  • Suitable for wood-wood and steel-wood connections due to 90° countersunk head and identical outer diameter of both threads

  • Two wooden elements can be precisely joined thanks to the head fitting flush with the wood surface


Very easy to install


  • Improved head countersinking and reduced risk of head breakage in hard wood surfaces (knotted areas) due to more uniform distribution of tension between head and underhead thread

  • Simplifies assembly and reduces the range of screws that need to be kept on assembly vehicles by combining the characteristics of countersunk head screws and washer head screws

  • Optimised grooving and biting of the screw due to gentle thread start

  • Low gap effect due to displacement effect of the dome-shaped milling elements in the tip
Proof of Performance

Approved as per ETA-11/0190

Notice
  • When fastening thin components, it is important to ensure that the screw head is flush with the wood surface.

  • We recommend using the Würth software or corresponding design aids for planning and designing your installation. Dimensioning of ASSY screws can be carried out in the Würth timber construction software from a screw dia. of 5 mm

  • 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 working 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
Application area
Steel zinc-plated, utilisation class 1 and 2, draft 22/11/2023
Characteristic load capacities of the connector
Fax,RkFv,Rk
DimensionsArt. no. PUlst1,mint1,max,90/90t1,max,90/090°/90°90°/0°90°/90°90°/0°
UnitmmmmmmmmkNkNkNkN
ASSY 4 PII CSMP
Screwing and press gluing, thread length required lg =15xd
KeyGeneral
Component 1 (screw head)Design value for load capacity
Component 2 (screw tip)
Component thickness t2 ≥ls - t1
characteristic raw density ρk = 350 kg/m³
8x70/320190 440 80750703238---2,82---2,50---
8x80/320190 440 80850803248---2,82---2,75---
8x90/320190 440 80950903258---2,82---2,75---
8x110/500190 440 811501103260---4,40---3,15---
8x130/600190 440 813501303270---5,28---3,37---
8x150/800190 440 815501503270---7,04---3,81---
8x170/800190 440 817501703290---7,04---3,81---
8x190/800190 440 8195019042110---7,04---3,81---
8x210/1000190 440 8215021042110507,872,644,312,55
8x230/1000190 440 8235023042130707,872,644,312,55
8x250/1000190 440 8255025042150907,872,644,312,55
8x270/1000190 440 82750270421701107,872,644,312,55
8x290/1000190 440 82950290421901307,872,644,312,55
8x310/1000190 440 83150310422101507,872,644,312,55
8x330/1000190 440 83350330422301707,872,644,312,55
8x350/1000190 440 83550350422501907,872,644,312,55
8x370/1000190 440 83750370422702107,872,644,312,55
8x210/1200190 440 921502104270507,873,174,312,55
8x270/1200190 440 92750270421501107,873,174,312,55
8x330/1200190 440 93350330422101707,873,174,312,55
  • ls - Length of the screw

  • 90°/90° - Screw-to-fibre angle 90° in component 1, 90° in component 2

  • 90°/0° - Screw-to-fibre angle 90° in component 1, 0° in component 2

  • t1,min - Minimum thickness of the component at the head end

  • t1,max,90/90 - Maximum thickness of component 1 at screw-to-fibre angle 90° in component 2

  • t1,max,90/0 - Maximum thickness of component 1 at screw-to-fibre angle 0° in component 2

  • Fax,Rk - Characteristic resistance of the connector to pull-out

  • Fv,Rk - Characteristic resistance of the connector to shearing
  • Holes not pre-drilled.

  • The screw is screwed into component 1 flush with the surface.

  • The load capacities apply for all component thicknesses t1,min ≤t1≤ t1,max.

  • For t1 ≥t1,min higher values may result for resistance to shearing.

  • Selected cross sections must fulfil the requirements for minimum cross section in accordance with ETA-11/0190.
Component thickness t1,min ≤t1 ≤t1,max
characteristic raw density ρk = 350 kg/m³		Fax,Rd = kmod · Fax,Rk/ϒM
Fv,Rd = kmod · Fv,Rk/ϒM

Approved as per ETA-11/0190

The requirements of the European Technical Approval (ETA) must be observed