Product Image
Block-and-Tackle Sash Balance
Spring-loaded block-and-tackle window balance for single- and double-hung sash. 17", 20", 21", 27", 28", and 29" lengths covering 8–28 lb sash capacities. Mill-finish or zinc-plated steel U-frame with internal spring + cord + pulley assembly.
Also known as
B&T balance · block balance · tackle balance · spring sash balance
Key Features
- Six standard lengths cover most residential and light-commercial windows
- Cord + pulley + spring internal assembly
- Replacement-grade fit for incumbent supplier products
Available Materials
Specifications
Component family
Browse the Sash Balances family →
Constant-force coil, block-and-tackle, and spiral-tube sash balances for single- and double-hung windows. 4–60 lb capacities.
Spec-equivalent for
Block-and-Tackle Sash Balance cross-references
Related Products
Pile Weatherstrip
Polypropylene pile weatherstrip for fenestration, shading, and access system applications. Available in a wide range of pile heights and backing widths to fit any track or channel profile. Custom lengths and densities available.
Sign in for pricing
Brush with Fin Seal
Combination brush and fin seal for enhanced air and light blocking. The rigid center fin provides a true weather seal while the surrounding pile filaments fill gaps and reduce vibration.
Sign in for pricing
Fur Strip
Continuous fur strip for acoustic damping, dust sealing, and light blocking in shading housings, commercial doors, and residential applications. Available with 12.5mm or 12.8mm backing widths for motorized screen channels. Sold in bulk spools.
Sign in for pricing
Technical Resources
Specifying Block-and-Tackle Sash Balance
EPDM vs Silicone Rubber Seals: A Material Selection Guide
EPDM handles outdoor temperature swings and ozone exposure well; silicone handles extreme heat. Here's the full decision framework.
8 min read
ComparisonBrush Seal vs Pile Weatherstrip: Which Sealing Solution Fits?
Fenestration calls it pile weatherstrip. Data centers call it a brush grommet. Conveyors call it a skirting seal. Here's what they actually are and how to specify them.
6 min read