40mm square key clamp fittings for 40 × 40mm box section: short and long tees, 90° and three-way elbows, crosses, wall and base flanges, rail supports, swivels and end caps. Use them for display stands, shelving, signage frames, workbenches and industrial furniture, joining galvanised square tube with an allen key and no welding. Square fittings are not for handrails or guardrails; use round key clamp fittings for anything safety-critical.
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