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ASSY® 3.0 SK A2 Wood construction screw
ASSY<SUP>®</SUP> 3.0 SK A2 Wood construction screw - 1
ASSY<SUP>®</SUP> 3.0 SK A2 Wood construction screw - 2
ASSY<SUP>®</SUP> 3.0 SK A2 Wood construction screw - 3

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ASSY® 3.0 SK A2 Wood construction screw

The ASSY 3.0 SK A2 with a large washer head and partial thread is specially designed for screwing two joined components outdoors and in wet rooms.

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Stainless steel A2, partial thread, large washer head, AW drive, ring thread in tip area

  • Connects the wood instead of splitting it

Large washer head

  • High penetration resistance / high consolidation effect.

AW drive — more power

  • Optimal force transmission

  • Excellent fit

  • Rapid finding

  • Screw settles securely

  • Virtually no unscrewing of bit

  • No wobbling

Asymmetric single thread – faster speed

  • Low screw-in torque – extends the service life of the processing machine and the bit insert

  • High over-turning force

  • Faster screwing than conventional particle board screws


  • Very precise positioning thanks to the 30° tip.

Ring thread — less tendency of the wood to split, very few blow-outs

  • Low splitting forces, in particular when screwing close to edges

  • Punch effect of ring thread largely prevents blow-outs


  • Corrosion-resistant, austenitic stainless steel A2 (1.4301; 1.4567)

Use Würth timber construction software to measure the ASSY screws with a diameter of more than 5mm. 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 steel-grade chlorine gas.

The range of applications of the various stainless steels is contained in the following ISER (German Information Office for Rustproof Stainless Steel, Non-Rusting Steels for Various Environmental Conditions, www.edelstahl-rostfrei.de, Information Sheet 828) table. Rustproof stainless steels (e.g. material no. 1.4016) are recommended there for use in atmospheric processes only for use in a rural environment, and here as well only with great restrictions. We therefore recommend only using 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. ASSY 3.0 particle board screws are optimised for use in wooden materials. When used in plastic anchors, a reduction of the load-bearing capacity is possible. Therefore, we recommend only using screws without optimised thread tips (drilling tip, mating thread, ring thread, serrated edge, self-clearing groove, etc.) in plastic dowels, e.g. Würth ASSY D, prefix 0151 (countersunk head) and prefix 0153 (pan head).

When using these screws, please follow ETA-11/0190 specifications.