ASSY^® 4 A2 CSMP timber screw A2 stainless steel plain partial thread countersunk milling pocket head

Name: ASSY ® 4 A2 CSMP timber screw A2 stainless steel plain partial thread countersunk milling pocket head
Brand: Würth
SKU: 0187480220

ASSY 4 A2 CSMP sst A2 PT cs mill. pckt RW
SCR-CS-CTRHD-WO-A2-RW40-8X220/100
ASSY 4 A2 CSMP

Art.-no. 0187480220

EAN 4061975615534

All versions

Specification

Universal partially thread screw made of high-quality austenitic A2 stainless steel for wood-wood connections (spruce) 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

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

Proof of Performance

ETA-11/0190 approved

Notice

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

Application area

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.

Can be used for outdoor applications and utilisation class 3

Instructions

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

Technical information


Nominal diameter (d)	8 mm
Length (l)	220 mm
Thread length (lg)	100 mm
Head type	Countersunk milling pocket head
Head details	Milling pockets
Head diameter (d_h)	15 mm
Head height (k)	4.9 mm
Internal drive	RW40
Thread type	Wood screw thread
Thread design	Partial thread
End milling cutter	Yes
Thread form	Single start thread
Core diameter	5.1 mm
Shape of tip	Tip with hilltop milling cutter
Angle of the tip	34 Degree
Material	Stainless steel A2
Surface	Plain
Min./max. screw-in angle	0-90 Degree
Suitable for use in the following materials	Wood, Derived timber product, Softwood, Board ply wood (BSP), Hardwood, LVL
Area of application	Façades, Terrace, Fence, Structural woodwork, Element construction, Timber panel construction, Timber construction, Wet areas, Play equipment, Outdoors
Suitable machines	Würth BS 18-A Power
Screw requiring approval	Yes
Approval	ETA-11/0190
RoHS-compliant	Yes

Edge distances in wood with an axial load

Remarks:
•	The values apply to a minimum thickness of the component of 10 x d
•	The minimum insertion depth of the screws in the front surface of the cross laminated timber is 10 x d
•	The requirements of the respective manufacturers of cross laminated timber components must be observed in the same way

Minimum clearances in mm for screws in cross laminated timber
Side surfaces							Front surfaces
d in mm	a₁	a₂	a_3,t	a_3,c	a_4,t	a_4,c	d in mm	a₁	a₂	a_3,t	a_3,c	a_4,t	a_4,c
d in mm	4 x d	2.5 x d	6 x d	6 x d	6 x d	2.5 x d	d in mm	10 x d	4 x d	12 x d	7 x d	6 x d	3 x d
8	32	20	48	48	48	20	8	80	32	96	56	48	24

Pre-drilling diameter according to ETA-11/0190 in mm
d in mm	8
Softwood	5,0
Hardwood	6,0
BauBuche¹⁾	6,5
1) According to 1459 expert report SWG ASSY BauBuche

Minimum distances in mm for pre-drilled screws in softwood, hardwood, BauBuche
Bracket between force and grain direction α = 0°							Bracket between force and grain direction α = 90°
d in mm	a₁	a₂	a_3,t	a_3,c	a_4,t	a_4,c	d in mm	a₁	a₂	a_3,t	a_3,c	a_4,t	a_4,c
d in mm	5 x d	3 x d	12 x d	7 x d	3 x d	3 x d	d in mm	4 x d	4 x d	7 x d	7 x d	7 x d	3 x d
8	40	24	96	56	24	24	8	32	32	56	56	56	24
1) The minimum clearances are specified in accordance with DIN EN 1995-1-1 tab. 8.2 for pre-drilled nail holes, where d is the male thread diameter 2) The minimum distances between 0° < α < 90° force to the direction of the grain can be determined more precisely in accordance with EN 1995-1-1 tab. 8.2

Edge distances in cross laminated timber under shear load

Remarks:
•	If the spacing between the screws in the direction of the grain and from the end of the end of the grain is at least 25 x d, the spacing to the unstressed edge may be reduced to 3 x d, even with component thicknesses t < 5 x d
•	The minimum thicknesses of the components to be connected must be observed in accordance with ETA-11/0190 (A.2.4.2)
•	When using woods at risk of splitting, the screws should always be pre-drilled and the
•	For steel-wood connections, the minimum distances (a₁, a₂) can be multiplied by a coefficient of 0.7
•	For wooden plate connections, the minimum distances (a₁, a₂) can be multiplied by a coefficient of 0.85
•	For Douglas fir wooden components, the minimum clearances in the direction of the grain must be increased by 50%

Edge distances in wood under shear load
Bracket between force and grain direction α = 0°			Bracket between force and grain direction α = 90°


	Stressed end of the end grain -90° < < α 90°	Unstressed end of the end grain 90° < α < 270°		Stressed edge 0° < α < 180°	Unstressed edge 180° < α < 360°

Remarks:
•	The minimum distances are defined in accordance with EN 1995-1-1 tab. 8.6, where d is the male thread diameter
•	The minimum thicknesses of the components to be connected must be observed in accordance with ETA-11/0190 (A.2.4.3)
•	For combined shear and axial tensile loads, the minimum clearances for screws and shear stress must be used

Minimum clearances in mm for screws in wooden components
DIN EN 1995-1-1	a₁	a₂	a_1,CG	a_2,CG
ETA-11/0190	a₁	a₂	a_1,c	a_2,c
d in mm	7 x d	5 x d	10 x d	4 x d
8	56	40	80	32

Minimum distances in mm for non-pre-drilled screws in wooden components 420 kg/m³≤ρ_k ≤ 500 kg/m³
Bracket between force and grain direction α = 0°							Bracket between force and grain direction α = 90°
d in mm	a₁	a₂	a_3,t	a_3,c	a_4,t	a_4,c	d in mm	a₁	a₂	a_3,t	a_3,c	a_4,t	a_4,c
d in mm	15 x d	7 x d	20 x d	15 x d	7 x d	7 x d	d in mm	7 x d	7 x d	15 x d	15 x d	12 x d	7 x d
8	120	56	160	120	56	56	8	56	56	120	120	96	56
1) The minimum clearances are specified in accordance with DIN EN 1995-1-1 tab. 8.2 for non-pre-drilled nail holes, where d is the male thread diameter 2) The minimum distances also apply to screw diameter ≥ 5 mm in components made of BauBuche (ETA-14/0354) for component thicknesses of t ≥ 7 x d 3) The minimum clearances between 0° < α < 90° force to the direction of the grain can be fixed more precisely in accordance with EN 1995-1-1 tab. 8.2 4) Wooden components with ρ_k > 500 kg/m³ must always be pre-drilled

Minimum distances in mm for non-pre-drilled screws in wooden components ρ_k ≤ 420 kg/m³
Bracket between force and grain direction α = 0°							Bracket between force and grain direction α = 90°
d in mm	a₁	a₂	a_3,t	a_3,c	a_4,t	a_4,c	d in mm	a₁	a₂	a_3,t	a_3,c	a_4,t	a_4,c
d in mm	12 x d	5 x d	15 x d	10 x d	5 x d	5 x d	d in mm	5 x d	5 x d	10 x d	10 x d	10 x d	5 x d
8	96	40	120	80	40	40	8	40	40	80	80	80	40
1) The minimum clearances are specified in accordance with DIN EN 1995-1-1 tab. 8.2 for non-pre-drilled nail holes, where d is the male thread diameter 2) The minimum distances between 0° < α < 90° force to the direction of the grain can be determined in accordance with DIN EN 1995-1-1 tab. 8.2

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Screw-in angle 45/60 degrees

SCRINAID-SCR-ASSY-(60-45°)-200X120X30

ASSY

Art.-no. 016530020

Easy-to-install screw-in angle for quick and precise angled fitting of long ASSY timber screws at an angle of 45 or 60 degrees

x 2 pcs

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