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ASSY 3.0 s/s A2 PT, c/s head AW
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A2 stainless steel, partial thread, countersunk head, AW drive
Joins wood instead of splitting it
Asymmetrical single-start thread — greater speed, greater traction
AW drive – more power
Ring thread — less tendency of the wood to split, very few blow-outs
Corrosion-resistant, austenitic stainless steel (1.4301; 1.4567)
Pre-drilling to core diameter on solid hard woods
ASSY® 3.0 A2 have limited resistance to acid and are unsuitable for chloride gas-containing atmospheres.
To attach metals to wood, machine a precise cutout in the metal tab.
ASSY 3.0 chipboard screws are optimised for use in wooden materials. If used in plastic anchors, this may cause a reduction in the load-bearing capacity. Therefore, we recommend only using screws without optimised thread tips (drill tip, mating thread, ring thread, serrated edge, self-clearing groove etc.) in plastic anchors, e.g. ASSY D, prefix number 0151 (countersunk head) and prefix 0153 (pan head).
The range of applications of the various stainless steels is detailed in the following table issued by the ISER (German Information Office for Rustproof Stainless Steel, Non-Rusting Steels for Various Environmental Conditions, www.edelstahl-rostfrei.de, Information Sheet 828). Rustproof stainless steels (e.g. material no. 1.4016) are recommended in terms of atmospheric conditions only for use in a rural environment, and in this respect only subject to significant restrictions. We therefore recommend using only austenitic stainless steels for outdoor applications, taking the environmental conditions into account. Stainless steel A4 is especially suitable for use in an industrial atmosphere and for use near the sea.
Available work documents:
Timber dimensioning software, load tables and detailed processing instructions can be found on the service page www.wuerth.de/assy.
Catalogue page as PDF 1
CAD data (available after login)
The ASSY 3.0 A2 made from corrosion-resistant, austenitic stainless steel is designed especially for applications outdoors, in damp rooms and in salty atmospheres
For coniferous wood or wood-based materials made from coniferous wood, the screw connection is made without pre-drilling. To reduce the edge distances, a pre-drilled hole can be made according to the core diameter. When screwing into hardwood, pre-drill according to ETA-11/0190.
Nominal diameter (d)
Head diameter (dh)
Head height (k)
Wood screw thread
Thread length (lg)
Shape of tip
Tip with ring thread
Angle of the tip
Stainless steel A2
Min./max. screw-in angle
Product weight (per item)
Suitable for use in the following materials
Board ply wood (BSP)
Area of application
Screw requiring approval