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ASSY® 4 A2 CS universal screw A2 stainless steel plain partial thread countersunk head

ASSY 4 A2 CS sst A2 PT countersunk head RW

Art.-no. 018746080
EAN 4065746504935

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Partial-thread screw made of high-quality austenitic A2 stainless steel with countersunk head for universal wood-wood fastening in outdoor areas exposed to the elements

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

Form-fitting connection to metal fittings or in wooden products with high bulk density

  • For fitting connection with full-thread steel screws

  • Perfect fit of 90° head in fitting parts with metal countersinks

  • Pulls together without head milling due to lack of milling elements below the head

  • The head is inserted by pressing

Higher breaking torque

  • Higher power transmission in hardwoods due to reinforced, asymmetrical thread flank geometry of the single 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

Stainless mounting for accessible wood connections in outdoor areas exposed to weathering

  • Made of austenitic, non-magnetic and non-rusting A2 stainless steel

  • Can be used in rural or urban environments or industrial atmospheres without significant exposure to chlorides or SO2

  • With friction-reducing slide coating for easy fastening
  • Austenitic stainless steel is characterised by a high degree of corrosion resistance against aggressive industrial air, sea air, tap water, river water, mine water and salt water, as well as woods containing tannic acid. It is resistant to acid to a certain extent and not suitable for atmospheres containing chlorine gas

  • 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

  • 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

Product information


Certificates/ Documents



Application area

For wood-wood connections designed to pull together

The partial thread starting immediately below the shank allows for wood-wood connections designed to pull together. The screw thread is positioned entirely in the lower component once screwed in.

Can be used for outdoor applications and utilisation class 3

  • To increase the joining effect or head pull-through resistance, combining with perfectly fitting washers for ASSY 4 is recommended

  • ASSY screws are approved for quasi-static loads

  • For optimum use of the screw, the right-size RW bit must be used

  • Partial-thread screws are ideal for connecting wooden components. To achieve optimum assembly of the components, the components to be fixed must not be thicker than the length of the shank

Nominal diameter (d)

6 mm

Length (l)

80 mm

Head type

Countersunk head

Head diameter (dh)

12 mm

Head height (k)

4.4 mm

Internal drive


Thread type

Wood screw thread

Thread design

Partial thread

Thread form

Single start thread

Thread length (lg)

50 mm

Core diameter

3.9 mm

Shape of tip

Tip with hilltop milling cutter

Angle of the tip

34 Degree


Stainless steel A2



Min./max. screw-in angle

0-90 Degree

Product weight (per item)

10.180 g

Suitable for use in the following materials

Derived timber product
Board ply wood (BSP)

Area of application

Structural woodwork
Wet areas
Board walk
Play equipment

Suitable machines

Würth BS 14-A Combi



Screw requiring approval




Additional accessory:


The perfect bit for the new generation of ASSY screws


The perfect bit for the new generation of ASSY screws


The perfect bit for the new generation of ASSY screws

Packaging unit

The packaging unit defines the number of articles in one packaging. In the catalog segment you can choose from different packaging units if a pop-up menu is displayed.

Just leave the field empty if you don't know the packaging unit when directly entering the article number in the shopping basket or when importing with Easy-/VarioScan. The packaging unit will be determined automatically.

Structure of our article number

The article number is made up of the following: VVVVAAABBB
VVVV = 4 digits for prefix number (please note that the first digit is currently always 0)
AAA = 3 digits for dimension part 1
BBB = 3 digits for dimension part 2

Example article number structures:
Example 1: Screw with dimensions of 4x10 mm:
00574 10 (2 spaces between the 4 and the 10)

Example 2: Screw with dimensions of 10x20 mm:
005710 20 (1 space between the 10 and the 20)

Example 3: Flat washer with an internal diameter of 6 mm:

Information on price display

Price per packaging unit (PU):
The displayed price is always in line with the displayed packaging, if the PU is 250 the price for 250 units, if the PU is 300 the price for 300 units.

Price with price key representation (PSL):
The price always applies to a quantity ruled through the price key:
Price for 1 unit
Price for 100 units
Price for 1000 units


The quantity shows the number of pieces or units of measure contained in the order or delivery for the respective article.
In contrast to sales packaging and secondary packaging, the disposal costs for chemical-technical products are shown separately. The breakdown of the individual costs can be found on the relevant products and also in the shopping cart, as well as in our General Terms and Conditions (GTC).

Cust. Mat. No.

Hazardous Material

Product information


Datasheets ()

CAD data  | 

Certificates/ Documents



Technical information