System WT

Double-threaded fasteners for the innovative assembly of timber components; wood/timber connections

The WT double-threaded lag bolt system is the innovative, cost-effective solution for durable joints in structural timberwork connections. Whether it's joining lath-work or reinforcing high load supports, WT offers the right answer for a wide range of applications. The system means saving time in both setting out and assembly operations, in contrast to conventional fasteners such as nails, wood screws and pressed steel supports. The WT System also increases aesthetic appeal, security and support strength.

WT-T Carbon Steel: Timber to timber connection and reinforcement

WT-S Austenitic Stainless Steel: Timber to timber connection


Joining applications in prefabrication or construction includes:

  • Joining main and secondary timber purlin
  • Purlin penetrations
  • Notched purlins
  • Dowelled purlins
  • Rafter-supporting purlins
  • Main trusses
  • Lateral tensile reinforcement


  • Simple, reliable calculation
  • Diverse range of application
  • Durable joints with high load-bearing capacity
  • Fast, efficient installation without pre-drilling
  • Form-fitting joint due to double thread
  • High aesthetic standard due to countersunk fastener
  • High fire resistance
  • Special installation accessories