3/8” Spirals

Caldwell’s 3/8” Spiral Balances: INSUL-TILT, SPIRO-MITE® and Enhanced 3/8” are made for tilt and non-tilt residential and commercial windows.
Caldwell’s 3/8” Spiral Balances succeeds AAMA Class 3 and has a weight capacity of 4-80 lbs.

INSUL-TILT: Single (4 to 42 lbs) & Tandem (42 to 80 lbs)
SPIRO-MITE®: Single (4 to 34 lbs) & Tandem (34 to 68 lbs)
Enhanced 3/8”: Single (35-42 lbs)

Product Features

  • Powerful spring capacity in a slim design fits into most aluminum & PVC window designs
  • AAMA Class 3, a minimum of 50% lift assistance
  • Provides consistent, smooth uniform operation throughout the full travel range of the sash
  • Broad, adjustable weight ranges providing:
    • Reduced inventory
    • Fine tune window performance
    • Field adjustable
  • Caldwell’s Music Wire Springs offer more consistent and dependable output
  • Galvanized steel tubes, providing structural strength and durability
  • INSUL-TILT: Tilt, Non-Tilt or Sideload Application: carrier dependent
  • Enhanced 3/8”: Heavy duty & pre-tensioned
  • SPIRO-MITE®: Non-Tilt and clip on available