A cable-type sliding door closer with 1200g pulling power is a compact, mechanical device designed to automatically pull sliding doors shut using a spring-loaded retraction mechanism. The “1200g” rating refers to the amount of tension the internal spring exerts, making it suitable for heavier doors or those with higher rolling resistance.It WorksThe device consists of a small housing (usually ABS plastic) containing a coiled spring and a high-strength steel cable.The Pulling Action: When you manually slide the door open, you pull the steel cable out of the housing, which winds the internal spring and stores energy.Automatic Closing: Once you release the door, the spring tension (equivalent to 1200g of weight) pulls the cable back into the box, dragging the door along with it until it is closed.Key Features of the 1200g ModelPulling Strength: 1200g (approx. 12 Newtons) is considered “Heavy Duty” for this category. While 500g–800g models are common for light bedroom doors or mosquito screens, the 1200g model is specifically for:Heavy wooden doors.Metal or security doors.Doors with thicker weather stripping or older, slightly stiffer rollers.Cable Specifications: Most use a 304 stainless steel wire (around 1.2m to 1.5m in length) that is plastic-coated to ensure quiet operation and prevent corrosion.Dual Installation: These units usually offer “punch-free” installation using high-strength 3M adhesive backing for glass or tile, or traditional screws for wood and drywallTechnical ComparisonFeature800g Model1200g ModelIdeal ForScreen doors, light interior doorsHeavy wood, metal, patio doorsTypical Wire Length1.2 Meters1.2 to 1.5 MetersDurability~50,000 cycles~80,000+ cycles (Heavy Duty).