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: 018723516

ASSY 4 A2 CS sst A2 FT countersunk head RW
SCR-CS-WO-A2-RW20-3,5X16/12
ASSY 4 A2 CS

Art.-no. 018723516

EAN 4061975614353

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)	3.5 mm
Length (l)	16 mm
Head type	Countersunk head
Head diameter (d_h)	7 mm
Head height (k)	2.3 mm
Internal drive	RW20
Thread type	Wood screw thread
Thread design	Full thread
Thread form	Single start thread
Thread length (lg)	13 mm
Core diameter	2.1 mm
Shape of tip	Tip with hilltop milling cutter
Angle of the tip	28 Degree
Material	Stainless steel A2
Surface	Plain
Min./max. screw-in angle	45-90 Degree
Product weight (per item)	0.750 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 12-A Power
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
/PU

RW® bit

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

Art.-no. 061470 20

The perfect bit for the new generation of ASSY screws

x 10 pcs

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

RW® bit

BIT-RW20-LUMINOUSORANGE-1/4ZO-L120MM

Art.-no. 061472 20

The perfect bit for the new generation of ASSY screws

x 5 pcs

The packaging unit defines the number of articles in one packaging. In the catalog segment you can choose from different packaging units if a pop-up menu is displayed.

Just leave the field empty if you don't know the packaging unit when directly entering the article number in the shopping basket or when importing with Easy-/VarioScan. The packaging unit will be determined automatically.

The article number is made up of the following: VVVVAAABBB
VVVV = 4 digits for prefix number (please note that the first digit is currently always 0)
AAA = 3 digits for dimension part 1
BBB = 3 digits for dimension part 2

Example article number structures:
Example 1: Screw with dimensions of 4x10 mm:
VVVVAAABBB
00574 10 (2 spaces between the 4 and the 10)

Example 2: Screw with dimensions of 10x20 mm:
VVVVAAABBB
005710 20 (1 space between the 10 and the 20)

Example 3: Flat washer with an internal diameter of 6 mm:
VVVVAAABBB
04076

Price per packaging unit (PU):
The displayed price is always in line with the displayed packaging, if the PU is 250 the price for 250 units, if the PU is 300 the price for 300 units.

Price with price key representation (PSL):
The price always applies to a quantity ruled through the price key:
Price for 1 unit
Price for 100 units
Price for 1000 units

The quantity shows the number of pieces or units of measure contained in the order or delivery for the respective article.

In contrast to sales packaging and secondary packaging, the disposal costs for chemical-technical products are shown separately. The breakdown of the individual costs can be found on the relevant products and also in the shopping cart, as well as in our General Terms and Conditions (GTC).