Double Star Threaded Caster Inserts Heat Treated Steel Fits One Inch Square Tubing Sixteen To Eighteen Gauge Five Sixteenths By Eighteen Thread Deep Setting For Secure Mount Flush Fit Four Pack

Deep-set double-star caster inserts for 1in square tubes
✔️ Thread: 5/16-18, fits 1in square tube, heat-treated steel, 4-pack

These heat-treated steel double-star threaded caster inserts are designed to be pressed into 1 inch square legs or posts. They provide a deep seating that holds the caster securely, allowing smooth movement over thresholds, cords, and cracks in industrial, commercial, and residential settings.

✅ Fits 1 in square tube outside dimension with 16-18 ga walls (approx 1.6-1.2 mm)
✅ Thread: 5/16-18 compatible with standard stem casters
✅ Made from heat-treated hardened steel for durability and long life
✅ Edges flush to outside of tubing for clean finish
✅ Pack of 4 inserts for multiple uses

💡 What is a square tube caster insert used for and how does it secure a 1 inch frame?

This handy piece locks into square tubing to keep casters from pulling out under load.

- Deep-set design sits inside the tube for strong pullout resistance
- Uses standard 5/16-18 threaded casters for compatibility
- Works with 16-18 ga square tubing (1.6-1.2 mm walls) for many projects
- Edges sit flush with outside of tube for clean finish