Four Inch Spring Loaded Castor With Shock Absorbing Black Pvc Wheel Tackle Bumpy Pavement Like A Champ And Bear Heavy Loads While Delivering Smooth Door Function All Day Long

Single pack spring caster with shock absorbing pvc wheel
✔️ 4 in (101 mm) wheel absorbs street shock while carrying 265 pounds safely

This four inch (101 mm) swivel caster pairs a coiled suspension system with a solid non slip pvc tire. You will mount it on sliding door tracks, garden carts, or utility bumpers. The internal steel spring keeps the wheel firmly pressed against cracked sidewalks and uneven gravel. You get consistent rolling power without those jarring impacts that ruin standard hardware faster. The rigid aluminum frame supports up to 120 kg (265 lb) while keeping daily movements quiet and steady.

✅ Flat profile treads glide silently on smooth indoor tiles
✅ Coil suspension layout eats up pothole impacts before they reach your frame
✅ Pre drilled backing plate slides onto existing bracket slots instantly
✅ Balanced weight distribution prevents sinking or scraping on asphalt

💡 What is the primary engineering function of a spring mounted rolling assembly on rough terrain?

The suspended base maintains continuous ground contact so heavy transport stays stable during transit operations.

- High tensile steel springs compress under dynamic floor stress to prevent structural fatigue

- Automatic leveling tread compensates for elevation changes without manual readjustment

- Standardized mounting holes align directly with commercial door rails and trailer chassis

This handy upgrade eliminates vibration damage for operators pushing heavy rolling stock.

✝️