Four Bolt Flange

The Hardcast Four Bolt Duct Connection System is designed to provide a simple and effective means of connecting rectangular duct sections together. This connection system may be used on all rectangular duct from 14 GA to 26 GA, resulting in sealed joints with clean lines that are aesthetically pleasing.

Four Bolt Flange Products

Four Bolt Flange Documents

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Tech Tip Volume 12 - Shelf Life and Batch Code Decoding
The Nexus Multi-Matic TDC/TDF corners are designed for both use in automatic insertion machines or for hand assembly. The Corners are flanged and embossed to provide strength and rigidity. The corner piece has a square bolt hole to accommodate compatible carriage bolts allowing for field assembly with a single wrench. Corners are pre-punched near bolt hole to accommodate #10 sheet metal screws that can be used as a replacement to the bolts.
G Flange is a hollow roll-formed section of galvanized steel,containing an integral sealant. The synthetic resin sealant has excellent adhesion to metal, is easy to work with, is non-flow to180º F and retains its sealing properties indefinitely
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