WRS 29" Series 400 Block and Tackle Window Balance, Stamp 2850, Non-Tilt | 28-32 Lbs, For Non-Tilt Windows, Window Sash Balance Replacement, 5/8" Channel, Guides Pre-Assembled, Sold Individually

WRS 29" Series 400 Block and Tackle Window Balance, Stamp 2850, Non-Tilt | 28-32 Lbs, For Non-Tilt Windows, Window Sash Balance Replacement, 5/8" Channel, Guides Pre-Assembled, Sold Individually

• REPLACEMENT WINDOW SASH BALANCE FOR NON-TILT WINDOWS – If your double or single hung window won't stay up, slides down on its own, or feels heavy to lift, a worn block and tackle balance is often the cause; this Series 400 balance restores smooth, controlled sash movement. This window sash balance is the correct replacement for non-tilt single and double hung windows.
• SPRING AND PULLEY SYSTEM – A weighted spring inside the metal channel works with an internal pulley (block) and cord (tackle) to counterbalance the sash, holding the window open at any height without a prop or stick. This is a genuine window balance spring replacement, not a generic window springs replacement kit, so it restores factory-matched performance rather than a universal fit.
• 5/8" METAL CHANNEL CONSTRUCTION – Housed in a 5/8" channel with a wound steel spring rated 28 to 32 lbs for this stamp, matched to the weight of your existing sash for consistent, long-term performance. This window channel balance construction is rated for consistent daily use.
• MEASURE BEFORE YOU ORDER – This balance measures 29" long (metal channel only, not including plastic guides) and is stamped 2850; compatibility varies by window manufacturer and model, so confirm your channel depth and length before ordering to avoid a return.
• WHAT YOU GET – One Series 400 block and tackle balance with an overall length of 29" and a 5/8" channel depth, rated 28-32 lbs for stamp 2850, guides pre-assembled; sold individually, take-out clips and other hardware not included.
• WRS — TRUSTED WINDOW HARDWARE SINCE 1989 – Window Repair Systems has been supplying precision-fit window and door hardware to homeowners, contractors, property managers, schools, and commercial facilities nationwide for over 35 years. Every part is sourced to help you repair — not replace. Shop with confidence.