John Duff Limited

John Duff Limited is a custom metal fabrication shop in Petrolia, Ontario (founded 1967) offering shearing, forming, rolling, CNC Hi-Def plasma cutting, and specialty aluminum and stainless welding (CWB W47.1 & W47.2 certified); they produce stairs, platforms, railings, ductwork, truck modifications, made-to-order pipe clamps (2"–60"+), and one-off custom projects for industrial, construction, manufacturing, commercial and agricultural clients while emphasizing local relationships, skilled tradesmanship, and community involvement.