Extended Square Threaded Inserts

• The tube wall is at the thin end of the 1 to 2 mm range (closer to 1 mm)
• The furniture is heavy (commercial tables, industrial workbenches, loaded shelving)
• The furniture gets moved, adjusted, or relocated frequently
• Standard-depth inserts in the same tube have worked loose or shifted under load
• The tube is 60 × 60 mm (only available as extended)

• The 40 × 40 mm tube wall is at the thick end (closer to 2 mm)
• The furniture is lightweight and the leveling foot carries minimal load
• The furniture stays in one location and the feet are rarely adjusted
• Use standard square threaded inserts for these applications (40 × 40 mm in M8, M10, M12)

The primary function. On a 60 × 60 mm tube with 1 mm walls, the tube cross-section is large relative to the wall thickness. A leveling foot loaded with heavy furniture weight creates leverage that acts on the insert body. Standard depth provides limited grip surface on four thin walls. Extended square threaded inserts add grip surface across all four walls simultaneously. Extended depth square leveling inserts that hold where standard depth does not.

Standard square threaded inserts go up to 50 × 50 mm. The 60 × 60 mm size is only available as an extended insert. Without the extended version, 60 × 60 mm square tubing would have no threaded insert option in the range. Extended insertion square inserts that bring the largest common square tube size into the leveling system.

Tube sealing, moisture protection, noise dampening. The extended body does not change any of these. The PA body seals the tube opening. The zinc-plated M8 nut provides the threaded connection. Unlike leaving heavy furniture on unleveled bare metal legs, the insert stays in place and supports the leveling foot because the extended body prevents the loosening that would eliminate the threaded connection.

Heavy commercial tables, industrial workbenches, and conference tables with 40 × 40 or 60 × 60 mm legs create significant sustained load on the insert. Every time a standard insert works loose, the leveling foot loses its anchor and the furniture drops to bare metal on the floor. Extended square threaded inserts reduce this by holding more securely. Square threaded inserts thin wall tubes need for reliable long-term leveling support.

Standard M8: 19.6 g. Extended M8: 23.7 g. The extended version adds 4.1 g of PA material, which translates to approximately 20% more body length and grip surface on all four interior walls. The heavier body also adds slightly more mass to the tube end, which can help dampen vibration. For most furniture applications, this weight difference is negligible to the overall furniture weight.

34.7 g. No standard-depth version exists for comparison because the 60 × 60 mm cross-section at 1 to 2 mm wall thickness requires extended depth for adequate grip. The 34.7 g weight is the heaviest insert in the square range, reflecting the larger PA body needed to grip the four 60 mm interior walls securely across the extended depth. Even at this weight, the insert adds less than 140 g to a four-legged table.

• Heavy commercial tables with 40 × 40 mm square legs on uneven floors
• Industrial workbenches and assembly tables with 40 × 40 or 60 × 60 mm legs
• Conference tables and large desks with heavy loads
• Any 60 × 60 mm square tube that needs a leveling foot (extended is the only option)
• Replacement for standard 40 × 40 M8 inserts that keep working loose

• Smaller square tubes: use standard square threaded inserts (20 × 20 to 50 × 50)
• 40 × 40 mm tubes where standard depth holds: no need for extended
• M10 or M12 on 40 × 40: use standard depth in those threads
• Round or rectangular tubes: use shape-specific extended inserts (round) or standard inserts (rectangular)

Heavy conference tables, industrial workbenches, laboratory tables, commercial kitchen prep tables, and retail fixture bases with 40 × 40 or 60 × 60 mm square legs. In these environments, the furniture carries substantial weight and the leveling feet are adjusted or stressed regularly. Extended square threaded inserts provide the anchor strength that standard depth cannot on thin-walled large square tubing. The four-wall grip distributes the extended contact evenly across all four interior surfaces, which is more stable than the continuous-curve grip of round inserts at comparable depths. Available in bulk for manufacturing runs. For commercial pricing, visit Business Solutions.

Large dining tables, home office desks, and institutional furniture with 40 × 40 mm or 60 × 60 mm square legs on uneven residential or institutional floors. The 60 × 60 mm size handles the heaviest residential tables, including stone-top dining tables and large conference-style home office desks where the table weight alone creates significant load on the leveling system. For leveling feet to pair with these inserts, browse adjustable leveling feet with M8 thread. For non-leveling legs on the same furniture, standard square tube plugs seal the tube without a threaded connection. On furniture where some legs need leveling and others do not, mix extended square threaded inserts on the leveling legs with standard plugs on the non-leveling legs.

Square Threaded Inserts: 6 sizes, 20 × 20 to 50 × 50 mm. M8, M10, M12. Standard insertion depth.

Adjustable Leveling Feet: M8 options including standard base, low-profile, anti-slip, ball-joint, tilt, and stainless steel rod.