ASSY^® 4 COMBI timber screw Steel zinc plated partial thread hexagon head

Name: ASSY ® 4 COMBI timber screw Steel zinc plated partial thread hexagon head
Brand: Würth
SKU: 0158780140

ASSY 4 COMBI steel zn PT combi head RW
SCR-WO-HEX-RW40-(A3K)-8X140/80
ASSY 4 COMBI

Art.-no. 0158780140

EAN 4061975618160

All versions

Specification

Powerful partial-thread screw with shank reinforcement for wood-wood fastening with washer or precise 90° metal-wood fastening in 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

Precise fit in metal and very high power transmission combined with two drive types

Shank reinforcement integrated on the underside

Combination of hexagon and RW drive

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

Notice

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

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 combi 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

Application

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.

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 a ∅ > 4 mm in utilisation class 2 (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)

Instructions

ASSY screws are approved for quasi-static loads

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

For cylindrical 90° holes in the metal tab to be fastened, it is recommended to use ASSY screws with shank reinforcement (ASSY 4 Combi, ASSY plus FT 4 combi, ASSY 4 JH joist hanger screw). The gap between the hole and the screw shank should not exceed 1 mm in accordance with DIN EN 1993-1-8

For a load-bearing wood-metal connection, ASSY screws must be tightened to a specific torque value. Tightening torque = required prevailing torque x 1.2 < 90% of the breaking torque

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

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

Technical information


Nominal diameter (d)	8 mm
Length (l)	140 mm
Head type	Hexagon head
Head height (k)	4.5 mm
External drive	WS12
Internal drive	RW40
Thread type	Wood screw thread
Thread design	Partial thread
Design	With shaft
Thread form	Coarse thread
Thread length (lg)	80 mm
Material	Hardened steel
Surface	Zinc plated
Suitable for use in the following materials	Wood, Derived timber product, Softwood, Board ply wood (BSP), Hardwood, LVL
Area of application	Element construction, Timber panel construction, Structural woodwork, Metal wood connections
Core diameter	5.3 mm
Shape of tip	Tip with hilltop milling cutter
Angle of the tip	34 Degree
Max. screw-in angle	90 Degree
Min. screw-in angle	0 Degree
RoHS-compliant	Yes
Approval	ETA-11/0190

Documents

Product information

Würth Catalogue (2)

Flip Book

Catalogue page as PDF 1

Datasheets (0)

Certificates/ Documents (6)

Declaration of performance EN

Declaration of performance DE

Approval/Assessment 1

Approval/Assessment 2

Approval/Assessment 3

Approval/Assessment 4

CAD data

Click here for the complete CAD library.

Accessory

Additional accessory:

Product

Description

Quantity

Price
/PU

RW® bit

BIT-RW40-LUMINOUSPINK-1/4ZO-L25MM

Art.-no. 061470 40

The perfect bit for the new generation of ASSY screws

x 10 pcs

RW® bit

BIT-RW40-LUMINOUSPINK-1/4ZO-L50MM

Art.-no. 061471 40

The perfect bit for the new generation of ASSY screws

x 5 pcs

RW® bit

BIT-RW40-LUMINOUSPINK-1/4ZO-L120MM

Art.-no. 061472 40

The perfect bit for the new generation of ASSY screws

x 5 pcs

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00574 10 (2 spaces between the 4 and the 10)

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Example 3: Flat washer with an internal diameter of 6 mm:
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04076

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