ASSY<SUP>®</SUP>plus 4 P CSMR wooden plate screw Hardened zinc-plated steel partial thread with underhead thread countersunk head - SCR-CSMR-DBIT-P-RW20-(A2K)-3,5X40/20

ASSY^®plus 4 P CSMR wooden plate screw Hardened zinc-plated steel partial thread with underhead thread countersunk head

Name: ASSY ® plus 4 P CSMR wooden plate screw Hardened zinc-plated steel partial thread with underhead thread countersunk head
Brand: Würth
SKU: 0178403540

ASSYplus 4 P CSMR steel zn PT cs mill. head RW
SCR-CSMR-DBIT-P-RW20-(A2K)-3,5X40/20

Art.-no. 0178403540

EAN 4061975502803

All versions

Specification

Partial thread screw with underhead thread countersunk milling head and high joining effect. Suitable for gap-free fastening, close to edges without pre-drilling of wooden composite boards or solid woods. The firm hold of the underhead thread enables connections without an assembly gap even with lightweight wooden fibre boards and the screw head ending at the board surface.

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 positioning and very clean drilling due to advanced centring drill tip

Positioning and drilling without chipping

Maximum drilling performance and precise drilling process through drilling cutting edges (similar to Forstner bits)

Precise positioning on hard surfaces without slipping thanks to centring pin

Quick screwing due to gentle start of thread

Easy countersinking in hardwood/softwood with high knot content as well as hard wood fibreboards

Very high milling performance due to milling ribs located at the countersunk head

Maximum reliability of the screw connection due to asymmetrical single thread

Optimal matching of drill tip and thread geometry

Excellent anchoring in wood due to asymmetrical arrangement of thread flanks

High strength values and ductility

Adjusted heat treatment guarantees high strength values and high ductility

Notice

Do not use the screw in applications with direct exposure to the elements or in humid rooms with atmospheres containing chlorine gas. Please use ASSYplus 4 stainless steel screws for outdoor applications and rooms with constant high humidity

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

ETA-11/0190 approved

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

Application

Application area

For connecting two wooden elements without assembly gap

The underhead thread beneath the head with reduced thread pitch and enlarged external diameter allows two wooden elements to be connected without assembly gap. A flush connection of the screw head with the material surface is possible.

For wood-wood connections designed to pull together

A wood-wood connection designed to pull together is possible owing to partial thread starting immediately after the shank. The thread in this case is positioned entirely in the lower second component.

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

High-quality surface protection, zinc, blue-passivated chromium(VI)-free 5 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

Instructions

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)	3.5 mm
Length (l)	40 mm
Thread length (lg) (l_g)	20 mm
Screw-thread length with drill tip (b) (b)	23.5 mm
Head type	Countersunk head
Head details	Milling ribs
Head diameter (d_h)	7 mm
Head height (k)	2.9 mm
Internal drive	RW20
Thread type	Wood screw thread
Thread design	Partial thread with underhead thread
Shaft length	6.0 mm
Design	With shaft
Thread form	Coarse thread
Core diameter	2.1 mm
Shape of tip	Drilling tip
Material	Hardened steel
Surface	Zinc plated
Max. screw-in angle	90 Degree
Min. screw-in angle	0 Degree
Suitable for use in the following materials	Board ply wood (BSP), Wood, Derived timber product, Hardwood, LVL, Softwood, Construction timber (KVH), OSB, Chipboard, Solid wood panel (SWP)
Area of application	Floorboards, Interior fitting, Body, Furniture, Universal
Approval	ETA-11/0190
Product weight (per item)	1.818 g
RoHS-compliant	Yes

Documents

Product information

Würth Catalogue

Datasheets(X)

Certificates/ Documents

Accessory

Additional accessory:

Product

Description

Quantity

Price
/PU

Universal holder E 6.3 (1/4) With quick-change chuck

HOLD-BIT-QCCHUK-1/4INX1/4IN-L51MM

Art.-no. 0614176711

x 1 pcs

1/4-inch bit drill holder

HOLD-BIT-QCCHUK-1/4IN-L60MM

Art.-no. 0614176760

Quick-change holder, optimised for use of bit drills and bits (shape C 6.3, shape E 6.3 and double bits) with 1/4 inch hexagon drive

x 1 pcs

RW® bit

BIT-RW20-LUMINOUSORANGE-1/4ZO-L25MM

Art.-no. 061470 20

The perfect bit for the new generation of ASSY screws

RW® bit

BIT-RW20-LUMINOUSORANGE-1/4ZO-L50MM

Art.-no. 061471 20

The perfect bit for the new generation of ASSY screws

x 5 pcs

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