Parallel disks with male or female thread
For some applications, parallel disk sizes are used. These can be installed using the ‘plug’ method, where the top skin is undercut after making the main cut down to the bottom skin. The resultant T-shaped chamber is then filled with adhesive and the TwinDisk pushed in - when set, the fastener is locked in. This version is also used where lateral loadings do not require the extra gluing of the top disk - instead, it is supported laterally by the panel’s top skin.
- Adhesive/Resin Plug method
The first picture shows the main cut through the plywood surface skin of the blockboard test piece, down to the inner skin surface. The normal 1mm clearance is recommended around the circumference of the bottom disk, to allow the adhesive to flow through and around the disk and central column to form a complete, permanent anchorage.
- Flush fit gluing considerations
All TwinDisks are manufactured to a precise overall height, allowing a glue thickness under the bottom disk of 1mm; height is calculated to leave the top head flush with the top surface. The clearance of the main hole can be reduced to 1mm overall; this gives lateral support to the top head. Note the depth of glue in picture 2.
- Optional polished finish
All TwinDisks are made in 316 marine grade stainless steel. Some customers require polished heads; we’re happy to quote the extra cost.
- Core-fill heat cure method
For composite materials such as carbon-fibre, panels are normally cured in an autoclave. This requires the use of a syntactic film such as Synspand® EA 9890 or 9899.2DF. This is wrapped around the TwinDisk core in the normal way; during cure the film expands, locking into the core material and locating the TwinDisk firmly and permanently in position.
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The initial cut is made through 
