Constant force coil springs
Part number: 9-C1541-1C-0-0

• Made of Stainless Steel 304
• Available in 3 types: short tail coil, medium tail coil and long tail coil
• Weight range – 3 lbs to 8 lbs
• Stamped with weight for easy identification
• can stack up to 3 coils on each side
  of the sash
• To be used with monobloc cassettes
  (9-C1521-2C-0-0 and 9-C1522-2C-0-0) or
  with standard support (9-C1500-2C-0-0)