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.
| Diameter | 1/4″ (6.9 mm) |
| Lengths | 2-7/8” (73 mm) to 9-1/8” (233 mm) |
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
| Specification | SDD | Thread Length | Drive Bit | Packaging Qty. | ||||
|---|---|---|---|---|---|---|---|---|
| # Item | Material | Head Type | in. | mm | in. | mm | ||
| SDD0673 | Hardened Steel | Cylinder Head | 0.27 x 2 7/8 | 6.9 x 73 | 1 1/4 | 31 | AW 40 | 50 |
| SDD0693 | Hardened Steel | Cylinder Head | 0.27 x 3 5/8 | 6.9 x 93 | 1 5/8 | 40 | AW 40 | 50 |
| SDD06113 | Hardened Steel | Cylinder Head | 0.27 x 4 1/2 | 6.9 x 113 | 2 | 50 | AW 40 | 50 |
| SDD06133 | Hardened Steel | Cylinder Head | 0.27 x 5 1/4 | 6.9 x 133 | 2 3/8 | 60 | AW 40 | 50 |
| SDD06153 | Hardened Steel | Cylinder Head | 0.27 x 6 | 6.9x 153 | 2 3/4 | 70 | AW 40 | 50 |
| SDD06173 | Hardened Steel | Cylinder Head | 0.27 x 6 3/4 | 6.9 x 173 | 3 1/8 | 80 | AW 40 | 50 |
| SDD06193 | Hardened Steel | Cylinder Head | 0.27 x 7 5/8 | 6.9 x 193 | 3 1/2 | 90 | AW 40 | 50 |
| SDD06213 | Hardened Steel | Cylinder Head | 0.27 x 8 3/8 | 6.9 x 213 | 3 7/8 | 100 | AW 40 | 50 |
| SDD06233 | Hardened Steel | Cylinder Head | 0.27 x 9 1/8 | 6.9 x 233 | 4 3/8 | 110 | AW 40 | 50 |
CAD Drawings
Design Guides
A catalog with all information on our ICC & CCMC code-approved fasteners, including dimensions, references & design properties.
Installation Instructions
Learn how to install MTC Solutions Self Drilling Dowels in this video showcasing an internal knife plate installed in CLT material.
Technical Blogs
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Product Description 
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