Self-Drilling Dowel

Cylinder Head Fastener for Internal Knife Plate Connections
  • Connection Type
  • Wood/Steel
  • Applications
  • Mass & Heavy Timber Construction

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Concealable Head

Partially Threaded

Self-Tapping Tip

Product Description

Product Description

The SDD Self-Drilling Dowel is a cylinder head dowel fastener designed for timber connections with knife plates. Its unique drilling tip eliminates the need for pre-drilling in wood, aluminum, and thin (< 1/8”) steel plates. It is made of hardened steel, resulting in higher shear resistance than non-hardened dowels.

Features

Diameter1/4″ (6.9 mm)
Lengths2-7/8” (73 mm)  to  9-1/8” (233 mm)
  • Cylinder head dowel
  • Hardened steel
  • Continuous thread
  • Easy to install with a cordless drill

Its low installation torque makes the SDD easy to install with a cordless drill without the need for additional equipment. The continuous thread ensures a tight fit that reduces slip in critical connections and helps drive the dowel forward reducing the amount of force needed for installation. MTC Solutions’ SDD is designed to be used with AW 40 drill bits for exceptional fit and durability. The cylinder head can be easily plugged with a wooden dowel.

Specifications

Specifications

SpecificationSDDThread LengthAW Drive BitPackaging Qty.
# ItemMaterialHead Typein.mmin.mm
SDD0673Hardened SteelCylinder Head1/4" x 2 7/8"6 x 731 1/4"31AW 4050
SDD0693Hardened SteelCylinder Head1/4" x 3 5/8"6 x 931 5/8"40AW 4050
SDD06113Hardened SteelCylinder Head1/4" x 4 1/2"6 x 1132"50AW 4050
SDD06133Hardened SteelCylinder Head1/4" x 5 1/4"6 x 1332 3/8"60AW 4050
SDD06153Hardened SteelCylinder Head1/4" x 6"6 x 1532 3/4"70AW 4050
SDD06173Hardened SteelCylinder Head1/4" x 6 3/4"6 x 1733 1/8"80AW 4050
SDD06193Hardened SteelCylinder Head1/4" x 7 5/8"6 x 1933 1/2"90AW 4050
SDD06213Hardened SteelCylinder Head1/4" x 8 3/8"6 x 2133 7/8"100AW 4050
SDD06233Hardened SteelCylinder Head1/4" x 9 1/8"6 x 2334 3/8"110AW 4050
CAD Drawings

CAD Drawings

ProductFile Extension
.DXF.DWG.IFC.STEP
Self-Drilling Dowel
Design Guides

Design Guides

Self-Drilling Dowel Design Guide

Design cost-effective shear connections with the use of MTC Solutions’ Self Drilling Dowel. Ideal for knife plate connections.

Structural Mass Timber Fastening Design Guide

Companion to the Structural Screws Design Guide, it provides pre-designed, easy-to-read tables for tens of mass timber connections using high-capacity ASSY self-tapping screws.

Installation Instructions

Installation Instructions

Self-Drilling Dowels [SDD] Installation

Learn how to install MTC Solutions Self Drilling Dowels in this video showcasing an internal knife plate installed in CLT material.

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