ASSY<SUP>®</SUP> 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head - SCR-CSMP-WO-RW20-(A2K)-4X40/24

ASSY<SUP>®</SUP> 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head - SCR-CSMP-WO-RW20-(A2K)-4X40/24 - 1

ASSY<SUP>®</SUP> 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head - SCR-CSMP-WO-RW20-(A2K)-4X40/24 - 2

ASSY<SUP>®</SUP> 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head - SCR-CSMP-WO-RW20-(A2K)-4X40/24 - 3

ASSY<SUP>®</SUP> 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head - SCR-CSMP-WO-RW20-(A2K)-4X40/24 - 4

ASSY<SUP>®</SUP> 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head - SCR-CSMP-WO-RW20-(A2K)-4X40/24 - 5

ASSY<SUP>®</SUP> 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head - SCR-CSMP-WO-RW20-(A2K)-4X40/24 - 6

ASSY<SUP>®</SUP> 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head - SCR-CSMP-WO-RW20-(A2K)-4X40/24 - 7

ASSY<SUP>®</SUP> 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head - SCR-CSMP-WO-RW20-(A2K)-4X40/24 - 8

ASSY<SUP>®</SUP> 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head - SCR-CSMP-WO-RW20-(A2K)-4X40/24 - 9

ASSY<SUP>®</SUP> 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head - SCR-CSMP-WO-RW20-(A2K)-4X40/24 - 10

ASSY<SUP>®</SUP> 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head - SCR-CSMP-WO-RW20-(A2K)-4X40/24 - 11

ASSY^® 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head

Name: ASSY ® 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head
Brand: Würth
SKU: 019014040

ASSY 4 CSMP steel zinc ptd. PT cs mill. pocket RW
SCR-CSMP-WO-RW20-(A2K)-4X40/24
ASSY 4 CSMP

Art.-no. 019014040

EAN 4061975679710

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ASSY^® 4 CSMP universal screw Steel zinc plated partial thread countersunk milling pocket head

Art.-no. 019014040

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Universal partial-thread screw for fast, gap-free fastening of wood-wood connections in furniture construction, interior fitting or wood construction in indoor dry or sheltered areas

Ideal power transmission thanks to RW recess

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, 1 bit for many screw diameters

Compatibility with previous AW drive

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

Low gap effect 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 anchorage thanks to higher thread flanks

Smooth thread start ensures optimised recessing and biting of the screw

Low gap 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

Proof of Performance

ETA-11/0190 approved

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 or A4 stainless steel screws and, if atmosphere contains chlorine, HCR 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

Application area

ETA-11/0190 approved

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

Product information

Würth Catalogue

Datasheets(X)

Certificates/ Documents

Application area

Parallel drive size RW30 is available for window applications with a diameter of 6 mm. This makes it easier to combine with AMO screws equipped with RW30.

For wood-to-wood connections designed for contraction

The partial thread starting immediately below the shank allows for wood-to-wood connections designed for contraction. In this case the thread is positioned entirely in the lower second component.

For applications in utilisation classes 1 and 2 (from dia. > 4 mm)

High-quality surface protection zinc blue passivated chromium(VI)-free, up to dia. 4 mm A2K 5 µm, from dia. 4.5 mm A3K 8 µm layer thickness

Suitable for use in utilisation class 1 (indoor areas) and from dia. > 4 mm in utilisation class 2 (wet areas or covered outdoor areas) in accordance with EN 1995-1-1:2010-12 + DIN SPEC 1052-100:2013-08

For screws from dia. 4.5 mm with zinc layer thickness 8 µm with Cr(III) passivation, the requirement of classification T2/C2 is fulfilled in accordance with prEN 14592:2017 (D)

Instructions

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)	4 mm
Length (l)	40 mm
Thread length (lg)	24 mm
Head type	Countersunk milling pocket head
Head details	Milling pockets
Head diameter (d_h)	8 mm
Head height (k)	2.5 mm
Internal drive	RW20
Thread type	Wood screw thread
Thread design	Partial thread
Thread form	Coarse thread
Core diameter	2.5 mm
Shape of tip	Tip with hilltop milling cutter
Angle of the tip	28 Degree
Material	Hardened steel
Surface	Zinc plated
Colour	Silver
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	Universal Furniture Body Fitting
Suitable machines	Würth BS 14-A Combi Würth BS 12-A Power
Screw requiring approval	Yes
Approval	ETA-11/0190
RoHS-compliant	Yes

General information
The load capacities were determined in accordance with ETA-11/0190 (23.07.2018), DIN EN 1995-1-1:2010-12 and DIN EN 1995-1-1/NA:2013-08 for ASSY^® screws without pre-drilling and a gross wood density of ρ_k ≥ 350 kg/m^₃. The load tables show a comprehensive range of options. Additional measurement options are available using the Würth Technical Software. Further information is available at www.wuerth.de/assy.

The shear load resistance values F_v,Rk in the table have been determined taking into account the "rope effect" ΔF_v,Rk. In the case of simultaneous axial and lateral loads, the shear load capacities listed in the table may not be used. If proof of combined load is required, the requirement of DIN EN 1995-1-1, Gl. (8.28) applies, whereby F_v,Rk is to be considered without rope effect component. The Würth Technical Software can be used for the latter.

Product:	ASSY 4 CSMP	Screw material:	Steel, hardened
Art. no.:	0190 1XX XXX	Corrosion protection:	A3K
Application:	Wood/wood, single shear connection	Maximum usage class:	2
Gross weight wood 1/wood 2:	350 kg/m³/350 kg/m³	Calculation basis:	ETA-11/0190:2018
Load tables
Combined load

	Shear resistance F_v,Rk for a 90° wood/wood connection to wood fibre with required minimum screw length ℓ_req

With washer/countersunk washer		With washer/countersunk washer		With washer/countersunk washer
F_v,Rk	ℓ_req	F_v,Rk	ℓ_req	F_v,Rk	ℓ_req	F_v,Rk	ℓ_req	F_v,Rk	ℓ_req	F_v,Rk	ℓ_req	F_v,Rk	ℓ_req	F_v,Rk	ℓ_req
mm	kN	mm	kN	mm	kN	mm	kN	mm	kN	mm	kN	mm	kN	mm	kN	mm
24	1,28	55	1,71	60	2,09	80					2,41	100
30	1,43	70	1,85	70	2,23	80	2,73	80			2,59	100	3,56	120
40	1,48	80	2,10	80	2,53	90	3,01	100	3,98	100	2,84	110	3,84	120	5,12	140
50	1,48	90	2,10	90	2,65	100	3,34	120	4,34	120	2,84	120	4,17	140	5,47	140
60	1,48	100	2,10	100	2,65	120	3,47	120	4,73	140	2,84	130	4,30	140	5,87	160
80	1,51	120	2,10	130	2,65	140	3,47	140	4,81	160	2,84	150	4,30	160	5,95	180
100	1,20	120	2,10	150	2,65	160	3,47	160	4,81	180	2,84	180	4,30	180	5,95	200
120			2,10	180	2,65	180	3,47	180	4,81	200	2,84	200	4,30	200	5,95	220
140			2,10	200	2,65	200	3,47	200	4,81	220	2,84	220			5,95	240
160			2,10	220	2,65	220	3,47	240	4,81	240	2,84	240	4,30	240	5,95	260
180			2,10	240	2,65	240	3,47	260	4,81	260	2,84	260	4,30	260	5,95	280
200			2,10	260	2,65	260	3,47	280	4,81	280	2,84	280	4,30	280	5,95	300
220			2,10	280	2,65	280	3,47	300	4,81	300	2,84	300	4,30	300	5,95	320
240			2,10	300	2,65	300	3,47	320	4,81	320	2,67	300	4,30	320	5,95	340
260			2,10	300	2,65	300	3,47	340	4,81	340	2,32	300	4,30	340	5,95	360
280							3,47	360	4,81	360			4,30	360	5,95	380
300							3,47	380	4,81	380			4,30	380	5,95	400
320							3,47	400	4,81	400			4,30	400	5,90	400
t₁	∅ 5		∅ 6		∅ 7		∅ 8		∅ 10		∅ 6		∅ 8		∅ 10

	Pull-out resistance F_ax,Rk for a 90° wood/wood connection to wood fibre with required minimum screw length ℓ_req

With washer/countersunk washer		With washer/countersunk washer		With washer/countersunk washer
F_ax,Rk	ℓ_req	F_ax,Rk	ℓ_req	F_ax,Rk	ℓ_req	F_ax,Rk	ℓ_req	F_ax,Rk	ℓ_req	F_ax,Rk	ℓ_req	F_ax,Rk	ℓ_req	F_ax,Rk	ℓ_req
mm	kN	mm	kN	mm	kN	mm	kN	mm	kN	mm	kN	mm	kN	mm	kN	mm
24	1,20	45	1,87	60	2,44	80					4,84	100
30	1,20	50	1,87	60	2,44	80	2,93	80			4,84	110	6,25	120
40	1,20	60	1,87	70	2,44	80	2,93	80	4,45	100	4,84	120	6,25	120	9,00	140
50	1,20	70	1,87	80	2,44	90	2,93	100	4,45	100	4,84	130	6,25	140	9,00	140
60	1,20	80	1,87	90	2,44	100	2,93	100	4,45	120	4,84	140	6,25	140	9,00	160
80	1,20	110	1,87	130	2,44	120	2,93	140	4,45	140	4,84	160	6,25	160	9,00	180
100	1,20	120	1,87	150	2,44	140	2,93	160	4,45	160	4,84	180	6,25	180	9,00	200
120			1,87	180	2,44	180	2,93	180	4,45	180	4,84	200	6,25	200	9,00	220
140			1,87	200	2,44	200	2,93	200	4,45	200	4,84	220	6,25	220	9,00	240
160			1,87	220	2,44	220	2,93	240	4,45	220	4,84	240	6,25	240	9,00	260
180			1,87	240	2,44	240	2,93	260	4,45	240	4,84	260	6,25	260	9,00	280
200			1,87	260	2,44	260	2,93	280	4,45	260	4,84	280	6,25	280	9,00	300
220			1,87	280	2,44	280	2,93	300	4,45	280	4,84	300	6,25	300	9,00	320
240			1,87	300	2,44	300	2,93	320	4,45	300	3,83	300	6,25	320	9,00	340
260			1,87	300	2,44	300	2,93	340	4,45	340	2,45	300	6,25	340	9,00	360
280							2,93	360	4,45	360			6,25	360	9,00	380
300							2,93	380	4,45	380			6,25	380	9,00	400
320							2,93	400	4,45	400			6,25	400	8,03	400
t₁	∅ 5		∅ 6		∅ 7		∅ 8		∅ 10		∅ 6		∅ 8		∅ 10

Key		General information
α	Angle between screw axis and grain direction of the component	•	Carbon steel screws may be used in usage classes 1 and 2
t₁	Thickness of component at head end	•	For connections with multiple screws, observe the effective number, nef, in acc. with DIN EN 1995-1-1,
t₂	Component 2: t₂ ≥ ℓ_req - t₁ (observe minimum component thicknesses)		Gl. (8.17) for shear loads and in acc. with ETA-11/0190, A.2.3.2 for axial loads
F_v,Rk	Characteristic resistance of a screw to shearing incl. rope effect		to be considered
F_ax,Rk	Characteristic resistance of a screw in the axial direction (thread pull-out, head	•	Specifications and pre-requisites in acc. with ETA-11/0190 and DIN EN 1995-1-1 to be adhered to
	pull-through, steel failure)	•	When maintaining the minimum component thickness and minimum screw spacings in acc. with
ℓ_req	Required screw length to achieve load capacity		DIN EN 1995-1-1 and ETA-11/0190, pre-drilling is not necessary
		•	Calculations are based on ETA-11/0190 and DIN EN 1995-1-1
		•	For shear load, the measured load capacity results from F_v,Rd = F_v,Rk · k_mod / γ_M and for
			axial load, from F_ax,Rd = F_ax,Rk · k_mod / γ_M

Edge distances in wood under shear load


	Stressed end grain -90° < α < 90°	Unstressed end grain 90° < α < 270°		Stressed edge 0° < α < 180°	Unstressed edge 180° < α < 360°
Bracket between load and grain direction α = 0°			Bracket between load and grain direction α = 90°

Minimum spacing in mm for non-pre-drilled screws in wooden components ρ_k ≤ 420 kg/m³
	10 x d	5 x d	15 x d	10 x d	5 x d	5 x d		5 x d	5 x d	10 x d	10 x d	7 x d	5 x d
3	30	15	45	30	15	15	3	15	15	30	30	21	15
3,5	35	17,5	52,5	35	17,5	17,5	3,5	17,5	17,5	35	35	24,5	17,5
4	40	20	60	40	20	20	4	20	20	40	40	28	20
4,5	45	22,5	67,5	45	22,5	22,5	4,5	22,5	22,5	45	45	31,5	22,5
	12 x d	5 x d	15 x d	10 x d	5 x d	5 x d		5 x d	5 x d	10 x d	10 x d	10 x d	5 x d
5	60	25	75	50	25	25	5	25	25	50	50	50	25
	72	30	90	60	30	30		30	30	60	60	60	30
	84	35	105	70	35	35		35	35	70	70	70	35
	96	40	120	80	40	40		40	40	80	80	80	40
	120	50	150	100	50	50		50	50	100	100	100	50
1) The minimum spacing is determined in accordance with DIN EN 1995-1-1 tab. 8.2 for non-pre-drilled nail holes, where d is the thread outer diameter 2) The minimum spacing between 0° < α < 90° load to the direction of the grain can be determined more precisely in accordance with DIN EN 1995-1-1 tab. 8.2
Bracket between load and grain direction α = 0°							Bracket between load and grain direction α = 90°

Minimum spacing in mm for non-pre-drilled screws in wooden components 420 kg/m³≤ρ_k ≤ 500 kg/m³
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	9 x d	7 x d
3	45	21	60	45	21	21	3	21	21	45	45	27	21
3,5	52,5	24,5	70	52,5	24,5	24,5	3,5	24,5	24,5	52,5	52,5	31,5	24,5
4	60	28	80	60	28	28	4	28	28	60	60	36	28
4,5	67,5	31,5	90	67,5	31,5	31,5	4,5	31,5	31,5	67,5	67,5	40,5	31,5
	15 x d	7 x d	20 x d	15 x d	7 x d	7 x d		7 x d	7 x d	15 x d	15 x d	12 x d	7 x d
5	75	35	100	75	35	35	5	35	35	75	75	60	35
6	90	42	120	90	42	42	6	42	42	90	90	72	42
7	105	49	140	105	49	49	7	49	49	105	105	84	49
8	120	56	160	120	56	56	8	56	56	120	120	96	56
10	150	70	200	150	70	70	10	70	70	150	150	120	70
1) The minimum spacing is determined in accordance with DIN EN 1995-1-1 tab. 8.2 for non-pre-drilled nail holes, where d is the thread outer diameter 2) The minimum spacing 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 spacing between 0° < α < 90° load to the direction of the grain can be determined more precisely in accordance with DIN EN 1995-1-1 tab. 8.2 4) Wooden components with ρ_k > 500 kg/m³ must always be pre-drilled
Bracket between load and grain direction α = 0°							Bracket between load and grain direction α = 90°

Minimum spacing in mm for pre-drilled screw connections in softwood, hardwood, BauBuche
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	5 x d	3 x d
3	15	9	36	21	9	9	3	12	12	21	21	15	9
3,5	17,5	10,5	42	24,5	10,5	10,5	3,5	14	14	24,5	24,5	17,5	10,5
4	20	12	48	28	12	12	4	16	16	28	28	20	12
4,5	22,5	13,5	54	31,5	13,5	13,5	4,5	18	18	31,5	31,5	22,5	13,5
	5 x d	3 x d	12 x d	7 x d	3 x d	3 x d		4 x d	4 x d	7 x d	7 x d	7 x d	3 x d
5	25	15	60	35	15	15	5	20	20	35	35	35	15
6	30	18	72	42	18	18	6	24	24	42	42	42	18
7	35	21	84	49	21	21	7	28	28	49	49	49	21
8	40	24	96	56	24	24	8	32	32	56	56	56	24
10	50	30	120	70	30	30	10	40	40	70	70	70	30
1) The minimum spacing is determined in accordance with DIN EN 1995-1-1 tab. 8.2 for pre-drilled nail holes, where d is the thread outer diameter 2) The minimum spacing between 0° < α < 90° load to the direction of the grain can be determined more precisely in accordance with DIN EN 1995-1-1 tab. 8.2
Bracket between load and grain direction α = 0°							Bracket between load and grain direction α = 90°

d in mm	3	3,5	4	4,5	5	6	7	8	10
Softwood	1,5	2,0	2,5	2,5	3,0	4,0	4,0	5,0	6,0
Hardwood	2,0	2,5	3,0	3,5	3,5	4,0	5,0	6,0	7,0
BauBuche¹⁾	2,5	2,5	3,0	3,5	4,0	4,5	5,5	6,5	8,0
1) According to 1459 expert report SWG ASSY BauBuche
Pre-drilling diameter acc. to ETA-11/0190 in mm

	If the spacing between the screws in the direction of the grain and to the end grain is at least 25 x d, the spacing to the unstressed edge at right angles to the grain direction may be reduced to 3 x d, even with component thicknesses of 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 screw connections should always be pre-drilled
•	For steel-wood connections, the minimum spacing (a₁, a₂) can be multiplied by a coefficient of 0.7
	For wooden plate connections, the minimum spacing (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 %
Notes




Edge distances in cross-laminated timber under shear load

Minimum spacing in mm for screws in cross-laminated timber
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
6	24	15	36	36	36	15	6	60	24	72	42	36	18
7	28	17,5	42	42	42	17,5	7	70	28	84	49	42	21
8	32	20	48	48	48	20	8	80	32	96	56	48	24
10	40	25	60	60	60	25	10	100	40	120	70	60	30
Side surfaces							Front surfaces

•	The values apply to a minimum thickness of the component of 10 x d
•	The minimum embedment 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 similarly observed
Notes



Edge distances in wood with an axial load

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
3	21	15	30	12
3,5	24,5	17,5	35	14
4	28	20	40	16
4,5	31,5	22,5	45	18
5	35	25	50	20
6	42	30	60	24
7	49	35	70	28
8	56	40	80	32
10	70	50	100	40
Minimum spacing in mm for screws in wooden components

•	The minimum spacing is defined in accordance with DIN EN 1995-1-1 tab. 8.6, where d is the thread outer 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 spacing for screws and shear stress must be used
Notes