--- product_id: 29402549 title: "WRS Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 27″ Length, Stamp 26-3 (13-19 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows" price: "$46.11" currency: USD in_stock: true reviews_count: 8 url: https://www.desertcart.us/products/29402549-wrs-caldwell-series-300-block-and-tackle-window-balance-5 store_origin: US region: United States of America --- # 27" length precision Supports 13-19 lbs sash weight Pre-assembled, tool-free install WRS Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 27″ Length, Stamp 26-3 (13-19 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows **Price:** $46.11 **Availability:** ✅ In Stock ## Summary > 🔧 Elevate your window game with effortless strength and smooth precision! ## Quick Answers - **What is this?** WRS Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 27″ Length, Stamp 26-3 (13-19 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows - **How much does it cost?** $46.11 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/29402549-wrs-caldwell-series-300-block-and-tackle-window-balance-5) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Smooth & Secure Operation:** Precision pulley system prevents slamming and sticking for quiet, safe use. - • **Heavy-Duty Galvanized Steel:** Built tough to resist corrosion and endure thousands of smooth lift cycles. - • **Trusted Expertise Since 1989:** Backed by 30+ years of proven reliability for homeowners and pros alike. - • **Engineered for Non-Tilt Windows:** Perfect fit for side-load vinyl & aluminum frames, ensuring seamless compatibility. - • **Versatile Length & Weight Range:** From 8" to 49" lengths, covering light to heavy sashes for any project. ## Overview The WRS Caldwell Series 300 Block & Tackle Window Balance is a heavy-duty, pre-assembled replacement hardware designed for non-tilt side-load windows. Measuring 27 inches and supporting sash weights between 13-19 lbs, it features galvanized steel construction for durability and a precision pulley system for smooth, quiet operation. Trusted by professionals and homeowners since 1989, it offers versatile sizing and easy installation without special tools. ## Description Discover our Window Balances Visit the Store Discover our Window Balances Visit the Store Window Repair Systems is driven by expertise and inspired by a simple mission: help you restore windows without the high cost of replacement. Our passion is making windows perform like new again , through high-quality parts, innovative tools, and expert guidance. With a catalog of over 30,000 parts and decades of know-how, w e provide lasting solutions for homeowners, contractors, schools, and property managers. Window Repair Systems is driven by expertise and inspired by a simple mission: help you restore windows without the high cost of replacement. Our passion is making windows perform like new again , through high-quality parts, innovative tools, and expert guidance. With a catalog of over 30,000 parts and decades of know-how, w e provide lasting solutions for homeowners, contractors, schools, and property managers. Review: Window balance that is low cost and effective - Great price and great product that is fully put together and ready to make your window new again Review: Window goes up. Window goes down. - Working well. No issue. Thank you! ## Features - 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 27" inches in length and supports 13-19 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. ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Caldwell Manufacturing | | Part Number | 01-30026-3 | | Item Weight | 8.8 ounces | | Product Dimensions | 28 x 0.5 x 0.5 inches | | Is Discontinued By Manufacturer | No | | Item Package Quantity | 1 | | Batteries Included? | No | | Batteries Required? | No | ## Images ![WRS Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 27″ Length, Stamp 26-3 (13-19 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows - Image 1](https://m.media-amazon.com/images/I/31s5at3CSAL.jpg) ![WRS Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 27″ Length, Stamp 26-3 (13-19 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows - Image 2](https://m.media-amazon.com/images/I/714CNUfzx0L.jpg) ![WRS Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 27″ Length, Stamp 26-3 (13-19 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows - Image 3](https://m.media-amazon.com/images/I/31CEY0HW1aL.jpg) ![WRS Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 27″ Length, Stamp 26-3 (13-19 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows - Image 4](https://m.media-amazon.com/images/I/51Z8qjpSqoL.jpg) ![WRS Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 27″ Length, Stamp 26-3 (13-19 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows - Image 5](https://m.media-amazon.com/images/I/41OABeNLXwL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: I ordered this and it didn't fit. my old balancer is stamped 26-3 ca2 cmc 7. how do i know which one will fit?** A: If this is the balance that you ordered, it should have worked for your replacement as the balances have the same stamp. Unless the incorrect balance was in the window to start with. If you will measure just the visible glass height that will give you the length that your balance should be. **Q: Mine is stamped 26-3 ah5 cmc 54? will this one work?** A: Yes, that is the replacement for your balance. **Q: My stamp says 28 6 gu cmc 5 any idea which one i will need?** A: I think a 29” spring , Mine we’re stamped 26 4 and the 27” product was a perfect match. I think the second number might be about the tension. I’m just guessing. **Q: Mine is 2630. which of this should I choose** A: 26-3 would work as well ## Customer Reviews ### ⭐⭐⭐⭐⭐ Window balance that is low cost and effective *by T***N on August 17, 2025* Great price and great product that is fully put together and ready to make your window new again ### ⭐⭐⭐⭐⭐ Window goes up. Window goes down. *by Q***Q on March 3, 2026* Working well. No issue. Thank you! ### ⭐⭐⭐⭐⭐ Easy install, great product! *by T***. on February 22, 2026* Perfect fit, easy installation, and now my window will go up, and stay up! Thank you! --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/29402549-wrs-caldwell-series-300-block-and-tackle-window-balance-5](https://www.desertcart.us/products/29402549-wrs-caldwell-series-300-block-and-tackle-window-balance-5) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-07*