WRS Caldwell Series 300 Block & Tackle Window Balance

WRS Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 36″ Length, Stamp 35-4 (23-30 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows
- ENGINEERED FOR NON-TILT WINDOWS – Designed for side-load, non-tilt window systems with a standard 5/8″ metal channel, commonly used in vinyl and aluminum single- or double-hung frames. This balance measures 36" inches in length and supports 23-30 lbs sashes. Each balance arrives pre-assembled with top and bottom guides attached, so installation is fast and frustration-free—no special tools required.
- AVAILABLE IN LENGTHS FROM 8″ TO 49″ (3 TO 44 LB RANGE) – The Series 300 fits nearly all non-tilt window sizes, from light residential sashes to heavy commercial frames. Covers a complete range of lengths and weight ratings for versatile use. Each balance is precision-tested for smooth, reliable performance and long-term durability. Sold individually; accessories and hardware not included. Contact WRS if your exact size isn’t listed.
- SMOOTH, SAFE & SECURE OPERATION – The Series 300’s precision pulley and spring system balances the sash to prevent slamming or sticking, keeping windows steady at any height. Designed for quiet, reliable performance in homes, schools, and offices where safety and ease of use matter every day.
- HEAVY-DUTY GALVANIZED STEEL CONSTRUCTION – Crafted from high-strength galvanized steel for long-term durability and corrosion resistance. Precision pulleys and springs maintain smooth lift through thousands of cycles, ensuring reliable performance for years of daily use. Built tough for pros yet simple enough for DIY installation.
- TRUSTED SINCE 1989 – WRS Window Repair Systems has over 30 years of experience supplying reliable, high-quality hardware. Trusted nationwide by homeowners, contractors, schools, and property managers for dependable repairs and long-lasting performance.
Country USA
Brand WRS
Manufacturer Caldwell Manufacturing
Binding Misc.
ItemPartNumber 01-30035-4
Model 01-30035-4
Color Metal
Size 35-4 (23-30 lbs)
UPCs 609613870965
EANs 0609613870965
ReleaseDate 0000-00-00

Country	USA
Brand	WRS
Manufacturer	Caldwell Manufacturing
Binding	Misc.
ItemPartNumber	01-30035-4
Model	01-30035-4
Color	Metal
Size	35-4 (23-30 lbs)
UPCs	609613870965
EANs	0609613870965
ReleaseDate	0000-00-00

WRS Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 36″ Length, Stamp 35-4 (23-30 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows

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