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This item is a Black PVC Threaded Square Ribbed Insert (often referred to as a "Square Cap with Nut"). Unlike a standard end cap, this specialized insert features an integrated metal thread, allowing for the attachment of adjustable feet, casters, or bolts to hollow square tubing.
Product Specifications & Features
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Material: High-impact Polyvinyl Chloride (PVC) or Polyethylene (PE) body with a reinforced zinc-plated steel or brass nut molded into the center.
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Threaded Center: Designed to accept threaded stems (typically M6, M8, or M10 sizes). This allows for the easy mounting of leveling feet or swivel wheels.
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Ribbed Shank: The external multi-ribbed design ensures a "crush fit" within the tubing. These ribs deflect to provide a secure grip across various tube wall thicknesses, preventing the insert from pulling out under weight.
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Load Bearing: Engineered to distribute weight from the threaded bolt across the walls of the metal tube, making it suitable for structural and furniture applications.
Primary Applications
| Application |
Benefit |
| Leveling Feet |
Allows desks, workbenches, and machinery to be leveled on uneven floors. |
| Caster Mounting |
Provides a secure mounting point for wheels on square-tube trolleys or racks. |
| Modular Displays |
Used in retail shelving to connect different segments using threaded rods. |
| Appliance Stands |
Enables the height adjustment of heavy kitchen or laboratory equipment. |
Technical Installation Notes
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Installation: Tap the insert firmly into the clean-cut end of a square tube using a rubber mallet. Ensure the tube is deburred for the best fit.
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Measurement: To select the correct size, you must know both the Outside Diameter (OD) of the square tube and the Thread Size (e.g., 25mm x 25mm M8).
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Durability: The plastic body provides a thermal and moisture barrier, protecting the internal metal nut from corrosion and preventing the tube from rusting from the inside out.
Commonly used for: Office furniture, industrial racking, conveyor stands, and adjustable commercial kitchen equipment.
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