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Coil Spring 1/2 inch Constant Force, 7.5 pound 1-1/4 Universal pocket

Part Number: 533030-7.5 Price: $4.12
Universal Constant Force balance for single or double hung sliding windows with 1.25 inch pocket

Pocket Width: 1.25 inch 
Coil Thickness: 1/2 inch
Weight Capacity: 7.5 pounds
Number on Balance is located on the end, sometimes hard to see

Available in several weight capacities: 3.5, 4.5, 5.5, 6.5, 7.5 and 9 pound. Coils can be mixed together to match appropriate sash weight
See below for other weight coils:
3.5 Pound Weight Capacity: 533030-3
4.5 Pound Weight Capacity: 533030-4
5.5 Pound Weight Capacity: 533030-5
6.5 Pound Weight Capacity: 533030-6
9 Pound Weight Capacity: 533030-9

Sold as coil only. Can be combined with other parts to make balance - coils, support covers, brake shoes and pivots sold separately