ASSY^® 4 A2 CS fittings screw A2 stainless steel plain full thread countersunk head

Name: ASSY ® 4 A2 CS fittings screw A2 stainless steel plain full thread countersunk head
Brand: Würth
SKU: 018725030

ASSY 4 A2 CS sst A2 FT countersunk head RW
SCR-CS-WO-A2-RW20-5X30/25
ASSY 4 A2 CS

Art.-no. 018725030

EAN 4061975614872

All versions

Specification

Full-thread screw made of high-quality austenitic A2 stainless steel with countersunk head for fixing metal profiles or fittings in wood in outdoor areas exposed to the elements or interior applications constantly exposed to corrosion

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

Form-fitting connection to metal fittings or in wooden products with high bulk density

For fitting connection with full-thread steel screws

Perfect fit of 90° head in fitting parts with metal countersinks

Pulls together without head milling due to lack of milling elements below the head

The head is inserted by pressing

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 steel-wood connections designed for tensile forces

The full thread starting immediately below the head allows for e.g. fitting-wood or sheet material-wood connections designed for tensile forces with high load-bearing capacity. Greater screw pull-out force is achieved by the maximum thread length.

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

Full-thread screws are suitable for secure mounting of fittings or thin materials. The screw length to be selected should be less than the plate thickness of substrate the screw is to be driven in

If countersunk head screws are used for a metal-to-wood mounting, the metal to be connected must be provided with suitable countersunk holes

Technical information


Nominal diameter (d)	5 mm
Length (l)	30 mm
Head type	Countersunk head
Head diameter (d_h)	9.6 mm
Head height (k)	3.2 mm
Internal drive	RW20
Thread type	Wood screw thread
Thread design	Full thread
Thread form	Single start thread
Thread length (lg)	25 mm
Core diameter	3.2 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
Product weight (per item)	2.990 g
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, Wet areas, Balcony, Board walk, Play equipment, Outdoors
Suitable machines	Würth BS 14-A Combi
Approval	ETA-11/0190
Screw requiring approval	Yes
RoHS-compliant	Yes

Minimum clearances for non-pre-drilled screws in wooden components ρ_k ≤ 420 kg/m³
	Screw diameter		Male thread diameter in mm						Screw diameter		Male thread diameter in mm
	Dia. 3 to 4.5 mm	Dia. 5 to 14 mm	3	3,5	4	4,5	5	6	Dia. 3 to 4.5 mm	Dia. 5 to 14 mm	3	3,5	4	4,5	5	6
a₁	10 x d	12 x d	30	35	40	45	60	72	5 x d	5 x d	15	18	20	23	25	30
a₂	5 x d	5 x d	15	17,5	20	22,5	25	30	5 x d	5 x d	15	18	20	23	25	30
a_3,t	15 x d	15 x d	45	52,5	60	67,5	75	90	10 x d	10 x d	30	35	40	45	50	60
a_3,c	10 x d	10 x d	30	35	40	45	50	60	10 x d	10 x d	30	35	40	45	50	60
a_4,t	5 x d	5 x d	15	17,5	20	22,5	25	30	7 x d	10 x d	21	25	28	32	50	60
a_4,c	5 x d	5 x d	15	17,5	20	22,5	25	30	5 x d	5 x d	15	18	20	23	25	30
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 calculated more precisely in accordance with DIN EN 1995-1-1 tab. 8.2

Shear load
Bracket between force and grain direction α = 0°	Bracket between force and grain direction α = 90°

Documents

Product information

Datasheets (0)

Certificates/ Documents (0)

Accessory

Additional accessory:

Product

Description

Quantity

Price
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