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ASSY®plus 4 A2 TH terrace constr. screw A2 stainless steel, plain, partial thread, TH, with grooved shank

ASSYplus 4 A2 TH sst A2 PT rill top head RW

Art.-no. 016676580
EAN 4062856212965

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Special partial-thread screw made of high-quality, austenitic A2 stainless steel with small top head and milling ribs for visually appealing fastening close to edges, without pre-drilling, of wooden façades, skirting boards, fences etc. in outdoor areas constantly exposed to weathering

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 bit)

  • Precise positioning on hard surfaces without slipping thanks to centring pin

  • Quick fastening due to gentle start of thread

Easy countersinking in softwoods and hardwoods

  • Visually appealing connections due to lens-shaped, rounded head

  • High milling power and chip collection for clean countersinking of the head in soft wood/hard wood

  • For universal use in wood and metal connections due to milling pockets integrated in the countersunk head

  • Can be combined with 90° metal countersink

Maximum reliability of the screw connection

  • Asymmetrical single thread

  • Through optimal matching of drill tip and thread geometry

  • Excellent anchoring in wood due to asymmetrical arrangement of thread flanks

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
  • We recommend using the Würth software or the corresponding design aids for planning and dimensioning your assembly. ASSY screws can be dimensioned in the Würth timber construction software from a ∅ 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.

Product information


Certificates/ Documents



Application area

For the fixed connection of two wooden elements

The slightly inclined grooves incorporated into the shank area enable two wooden elements to be permanently connected in the assembled state. Any creaking caused by the drying and swelling of the wooden components is reduced. The mechanical fracture properties of the screw are also increased.

For wood to wood connections designed to pull together

The partial thread starting immediately below the shank allows for wood to wood connections designed to pull together. The screw thread is positioned entirely in the lower component once screwed in.

  • 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

  • ASSY screws are approved for quasi-static loads

  • ASSY stainless steel screws can be used to attach hard wood terraces and flooring. Pre-drilling is recommended for tropical timber with high bulk density

Nominal diameter (d)

6.5 mm

Length (l)

80 mm

Thread length (lg) (lg)

38 mm

Screw-thread length with drill tip (b) (b)

42.5 mm

Head type

Top head

Head diameter (dh)

9 mm

Head height (k)

5.5 mm

Internal drive


Thread type

Wood screw thread

Thread design

Partial thread with grooved shank

Core diameter

3.8 mm

Shape of tip

Drilling tip


Stainless steel A2



Max. screw-in angle

90 Degree

Min. screw-in angle

45 Degree

Suitable for use in the following materials

Board ply wood (BSP)
Derived timber product

Area of application

Wet areas
Play equipment
Board walk

Product weight (per item)

12.500 g



Additional accessory:


The perfect bit for the new generation of ASSY screws


The perfect bit for the new generation of ASSY screws


The perfect bit for the new generation of ASSY screws


x 1 pcs

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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.

Structure of our article number

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:
00574 10 (2 spaces between the 4 and the 10)

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

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

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Price for 1 unit
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Cust. Mat. No.

Hazardous Material

Product information


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Technical information