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ASSY® Isotop Timber screw
ASSY<SUP>®</SUP> Isotop Timber screw - 1
ASSY<SUP>®</SUP> Isotop Timber screw - 2

For detailed information, other images and documents, please select individual articles from the following table.

ASSY® Isotop Timber screw

Double thread screw ideal for securing roof insulation and façade mounting using soft or pressure-resistant insulating materials

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Available in 1 version

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Exclusively for trade customers

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Exclusively for trade customers

Register now and access more than 125,000 products

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Prices for customers after login

Steel, blue zinc-plated, double thread, cylinder head, AW drive


Small cylinder head — ideal for sinking into wood


A coarse, single-flight asymmetrical thread reduces the screw-in time by 30%

Plastic non-friction coating:

Enables easy screw-in due to sharp threads with glide-promoting coating

Tip with counter thread:
•Reduces the tendency of the wood to split
•Reduction of the screw-in torque

AW drive:

  • Optimum centring

  • Largest possible contact surface of the bits in the tip, thus no ejection forces

Combination/replacement products:

  • ASSY 3.0 SK

  • ASSY plus FT

ASSY Isotop is screwed into the rafters, for example, through the securing battens and insulation without pre-drilling. For very dry wood (e.g. old building renovation) we recommend pre-drilling the securing battens with 8 mm.

You can use the Würth timber dimensioning software for an individual structural recommendation. Use this formula to easily calculate the screw length (specified in mm).


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