ASSY^® 4 PII CSMP universal screw Steel zinc-plated partial thread with underhead thread milling pocket head

Name: ASSY ® 4 PII CSMP universal screw Steel zinc-plated partial thread with underhead thread milling pocket head
Brand: Würth
SKU: 0190440829

ASSY 4 PII CSMP steel zinc pltd underhead thr. RW
SCR-CSMP-P-WO-RW40-(A3K)-8X290/100
ASSY 4 P CSMP

Art.-no. 0190440829

EAN 4065746086738

All versions

Specification

Special partial thread screw with underhead thread with tightening effect for flat, close-to-edge and high-load-bearing wood-wood and steel-wood connections with no gap in interior finishing or timber construction in dry indoor areas or damp areas

Ideal power transmission thanks to RW recess

More power due to larger contact area at the bit

More stability, one-handed working and 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

Innovative underhead thread

Very high head pull-through (> ASSY 4 WH) due to supporting underhead thread and increased head diameter

Gap-free assembly is ensured by the opposite grooved shank applying pressure and the underhead thread with a smaller pitch, tightening effect approx. 2 mm

Suitable for wood-wood and steel-wood connections due to 90° countersunk head and identical outer diameter of both threads

Two wooden elements can be precisely joined thanks to the head fitting flush with the wood surface

Very easy to install

Improved head countersinking and reduced risk of head breakage in hard wood surfaces (knotted areas) due to more uniform distribution of tension between head and underhead thread

Simplifies assembly and reduces the range of screws that need to be kept on assembly vehicles by combining the characteristics of countersunk head screws and washer head screws

Optimised grooving and biting of the screw due to gentle thread start

Low gap effect due to displacement effect of the dome-shaped milling elements in the tip

Proof of Performance

Approved as per ETA-11/0190

Notice

When fastening thin components, it is important to ensure that the screw head is flush with the wood surface.

We recommend using the Würth software or corresponding design aids for planning and designing your installation. Dimensioning of ASSY screws can be carried out in the Würth timber construction software from a screw dia. of 5 mm

ASSY 4, ASSYplus 4 and ASSYplus 4 VG chipboard screws are optimised for use in timber and engineered wood. For applications in plastic anchors where the working load 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

Steel zinc-plated, utilisation class 1 and 2, draft 22/11/2023
							Characteristic load capacities of the connector
							F_ax,Rk		F_v,Rk

Dimensions	Art. no.	PU	l_s	t_1,min	t_1,max,90/90	t_1,max,90/0	90°/90°	90°/0°	90°/90°	90°/0°
		Unit	mm	mm	mm	mm	kN	kN	kN	kN
ASSY 4 PII CSMP
Screwing and press gluing, thread length required lg =15xd
Key						General
Component 1 (screw head)						Design value for load capacity
Component 2 (screw tip)
Component thickness t₂ ≥l_s - t₁ characteristic raw density ρ_k = 350 kg/m³
8x70/32	0190 440 807	50	70	32	38	---	2,82	---	2,50	---
8x80/32	0190 440 808	50	80	32	48	---	2,82	---	2,75	---
8x90/32	0190 440 809	50	90	32	58	---	2,82	---	2,75	---
8x110/50	0190 440 811	50	110	32	60	---	4,40	---	3,15	---
8x130/60	0190 440 813	50	130	32	70	---	5,28	---	3,37	---
8x150/80	0190 440 815	50	150	32	70	---	7,04	---	3,81	---
8x170/80	0190 440 817	50	170	32	90	---	7,04	---	3,81	---
8x190/80	0190 440 819	50	190	42	110	---	7,04	---	3,81	---
8x210/100	0190 440 821	50	210	42	110	50	7,87	2,64	4,31	2,55
8x230/100	0190 440 823	50	230	42	130	70	7,87	2,64	4,31	2,55
8x250/100	0190 440 825	50	250	42	150	90	7,87	2,64	4,31	2,55
8x270/100	0190 440 827	50	270	42	170	110	7,87	2,64	4,31	2,55
8x290/100	0190 440 829	50	290	42	190	130	7,87	2,64	4,31	2,55
8x310/100	0190 440 831	50	310	42	210	150	7,87	2,64	4,31	2,55
8x330/100	0190 440 833	50	330	42	230	170	7,87	2,64	4,31	2,55
8x350/100	0190 440 835	50	350	42	250	190	7,87	2,64	4,31	2,55
8x370/100	0190 440 837	50	370	42	270	210	7,87	2,64	4,31	2,55
8x210/120	0190 440 921	50	210	42	70	50	7,87	3,17	4,31	2,55
8x270/120	0190 440 927	50	270	42	150	110	7,87	3,17	4,31	2,55
8x330/120	0190 440 933	50	330	42	210	170	7,87	3,17	4,31	2,55
l_s - Length of the screw 90°/90° - Screw-to-fibre angle 90° in component 1, 90° in component 2 90°/0° - Screw-to-fibre angle 90° in component 1, 0° in component 2 t_1,min - Minimum thickness of the component at the head end t_1,max,90/90 - Maximum thickness of component 1 at screw-to-fibre angle 90° in component 2 t_1,max,90/0 - Maximum thickness of component 1 at screw-to-fibre angle 0° in component 2 F_ax,Rk - Characteristic resistance of the connector to pull-out F_v,Rk - Characteristic resistance of the connector to shearing						Holes not pre-drilled. The screw is screwed into component 1 flush with the surface. The load capacities apply for all component thicknesses t_1,min ≤t₁≤ t_1,max. For t₁ ≥t_1,min higher values may result for resistance to shearing. Selected cross sections must fulfil the requirements for minimum cross section in accordance with ETA-11/0190.
Component thickness t_1,min ≤t₁ ≤t_1,max characteristic raw density ρ_k = 350 kg/m³						F_ax,Rd = k_mod · F_ax,Rk/ϒ_M F_v,Rd = k_mod · F_v,Rk/ϒ_M

Approved as per ETA-11/0190

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

Application

Application area

For connecting two hardened wooden elements that fit exactly without leaving a gap, in particular for structural timber constructions or load-bearing purposes.

Screws with a diameter of 8 mm and a thread length of 120 mm (15xd) are ideal for screwing and press gluing.

The underhead thread has a reduced thread pitch and enlarged external diameter and allows two wooden elements to be connected without leaving a gap.

For applications where a flat finish of the screw head with the wood surface is required.

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

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

The maximum gap between the components to be joined must not exceed 2 mm

ASSY screws are approved for quasi-static loads

For optimal use of the screw, use the RW bit that fits exactly

Technical information


Nominal diameter (d)	8 mm
Nominal diameter 2	8 mm
Length (l)	290 mm
Thread length (lg)	100 mm
Head type	Countersunk head
Head details	Milling pockets
Head diameter (d_h)	18.5 mm
Head height (k)	8 mm
Internal drive	RW40
Thread type	Wood screw thread
Thread design	Partial thread with underhead thread
End milling cutter	Yes
Shaft length	148 mm
Thread form	Coarse thread
Core diameter	5.3 mm
Shape of tip	Tip with hilltop milling cutter
Angle of the tip	34 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, Softwood, LVL, Solid wood panel (SWP), Chipboard, Plywood, Board ply wood (BSP), Glulam (BSH), Construction timber (KVH)
Area of application	Roof, Roofer, Ceiling, Wood, Timber construction, Structural woodwork, Board doubling, Screw press gluing, Metal wood connections, Rafter purlin connection, Carrier doubling
Suitable machines	Würth BS 13 SEC, Würth BS 18-A Power
Screw requiring approval	Yes
Approval	ETA-11/0190
RoHS-compliant	Yes

Documents

Product information

Datasheets (0)

Certificates/ Documents (0)

Accessory

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Additional accessory:

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Description

Quantity

Price
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