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ASSY® 4 WH II washer head screw Steel zinc plated partial thread washer head II

ASSY 4 WH II steel zinc ptd. PT washer head II RW

Art.-no. 0177580140
EAN 4061975618801

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Universal partial-thread screw with washer head washer head for wood-wood fastening, 90° or inclined screw connection in structural wood construction in indoor dry or sheltered areas

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

Visually appealing screw connection on wood surface with the option of countersinking like a countersunk head

  • High head penetration values and strong combination of two wooden components due to the large head diameter

  • Increase the pulling together capacity by combining with U-washers

Significant reduction in the amount of force required when fastening in the screw

  • Less splitting when immersing the shank due to the displacement milling effect of the milling shank

  • Minimised risk of screw breakage due to high breaking torque

  • Reduced risk of injury from protruding metal chips due to the integration of the milling shank into the thread

  • High protection of the application tools

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

High strength values and ductility

  • Adjusted heat treatment guarantees high strength values and high ductility
  • We recommend using the Würth software or the corresponding design aids for planning and dimensioning your assembly. Dimensions of 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 WH or ASSY 4 A2 BP 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

Product information


Certificates/ Documents



Application area

Due to its medium head size, it is ideally suited for the universal use in assemblies where several applications need to be covered

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 screw thread is positioned entirely in the lower component once screwed in.

For applications in utilisation class 1 and utilisation class 2 (from ∅ > 4 mm)

  • High-quality surface protection, zinc, blue-passivated chromium(VI)-free 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

  • 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-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

  • For long screws arranged in a cross shape or in a screw block with narrow edge clearances, it is advisable to drill pilot holes or use a screw-in aid to avoid intersecting of the screws

Nominal diameter (d)

8 mm

Length (l)

140 mm

Thread length (lg)

80 mm

Head type

Washer head II

Head diameter (dh)

18.4 mm

Head height (k)

2.5 mm

Internal drive


Thread type

Wood screw thread

Thread design

Partial thread

End milling cutter


Thread form

Coarse thread

Core diameter

5.3 mm

Shape of tip

Tip with hilltop milling cutter

Angle of the tip

34 Degree


Hardened steel


Zinc plated



Max. screw-in angle

90 Degree

Min. screw-in angle

0 Degree

Suitable for use in the following materials

Derived timber product
Board ply wood (BSP)

Area of application

Structural woodwork
On rafter insulation
Element construction
Timber construction
Timber panel construction

Additional accessory

Bit lock





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