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Connectors
Timber Connectors
SDD

Self-Drilling Dowel

The CE marked SDD dowel is the ideal fixing for hidden connections in combination with aluminium connectors such as BTALU. 
The double threaded dowel has a cylinder head with an T-40 6-lobe drive and the unique point design reduce the splitting in timber. The groove on the lower thread allows the material to be removed during installation.

Technical Data Sheet
CE Marking
Service class 2
Electrogalvanized steel 5µm
Indoor
SDD Main image

Product Details

Images

SDD Features image 2
SDD Features image 1
SDD application image 1
SDD application image 2
SDD application image 3
SDD application image 4
SDD application image 5
SDD application image 6

Features

Benefits

  • CE-marked
  • No pre-drilling required
  • T-40 6-lobe drive
  • Small cylinder head for hidden connections
  • Groove for chip-removing

Material

  • Electro galvanised carbon steel

Application

Applications

  • Glulam beams
  • CLT wall to CLT floor

Suitable for

  • Concealed aluminium connectors

Technical Data

Dimensions

SDD dim image

Product Dimensions

References Item code Diameter [d] Length [L] Head diameter [dh] Upper shank diameter [d1] Upper thread length [Lg2] Lower thread length [Lg1] Bit
SDD7.5X93781197.593126.9278.5T-40
SDD7.5X11378120113126.93612.5T-40
SDD7.5X13378121133126.93612.5T-40
SDD7.5X15378122153126.93612.5T-40
SDD7.5X17378123173126.93612.5T-40

Installation

Installation

Installation

The self-drilling dowel can be screwed directly through the wooden part to be assembled with the aluminium connector, without pre-drilling.

For installation with an aluminium connector, we recommend using a high-torque, low-speed screwdriver (600-1000 rpm). A pressure of 25 to 30 kg should be applied to the screwdriver after the drill tip comes into contact with the aluminium.

It is recommended to have a wood notch clearance of 1 to 2 mm, i.e. a notch of 7 to 8 mm for a 6 mm thick plate (BTALU type), to allow chips to be removed. The dowel must be perpendicular to the plate to be drilled.

Certification

Declaration of Performance (DoP)

uk-dop-h23-0004-01-s.pdf (249.2 KB)

Downloads

  • SDD dowel

    Self-Drilling Dowels

    The CE marked SDD self-drilling dowel offers an efficient fastening method for glulam and CLT in combination with aluminium connectors. 
    The double threaded dowel has a cylinder head with an T-40 6-lobe drive and the unique point design reduces the splitting of the timber. 

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Simpson Strong-Tie Poland

Simpson Strong-Tie Etanco P.S.A.

ul. Karczunkowska 42
02-871 Warszawa
Poland

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