--- product_id: 5535679 title: "Kester 24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool" brand: "kester" price: "€ 133.92" currency: EUR in_stock: true category: "Kester" url: https://www.desertcart.sk/products/5535679-kester-24-6337-0010-44-rosin-core-solder-63-37 store_origin: SK region: Slovakia --- # Instant-action wetting Bright, shiny joints Industry standard for 40+ years Kester 24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool **Brand:** kester **Price:** € 133.92 **Availability:** ✅ In Stock ## Summary > ⚡ Solder smarter, shine brighter — join the pros who never settle. ## Quick Answers - **What is this?** Kester 24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool by kester - **How much does it cost?** € 133.92 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/5535679-kester-24-6337-0010-44-rosin-core-solder-63-37) ## Best For - kester enthusiasts ## Why This Product - Trusted kester brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted legacy:** Dominating the industry for over four decades with proven reliability. - • **Optimized flux core:** High-activity rosin core ensures smooth, efficient production line soldering. - • **Lightning-fast wetting:** Experience instant-action flux for seamless soldering every time. - • **Universal compatibility:** Excellent solderability across a wide range of metallizations. - • **Brilliant finish guaranteed:** Leaves bright, shiny solder joints that impress and last. ## Overview Kester 24-6337-0010 44 Rosin Core Solder is a 63/37 alloy on a 1 lb spool, featuring a high-activity rosin flux core that delivers instant wetting and bright, reliable solder joints. Trusted by professionals for over 40 years, it ensures superior solderability across various metals, making it the go-to choice for efficient, high-quality electronic assembly. ## Description Kester 44 rosin flux is an activated rosin formula for use in flux-cored solder wire. Kester 44 rosin flux has virtually dominated the field of activated rosin core solders for well over four decades. An outstanding performance feature of this flux is the "instant-action" wetting behavior. The high mobility and fast-spreading action of this flux results in more reliable production line soldering. ## Features - Industry standard for decades - Excellent solderability to a wide variety of metallization's - High activity rosin core formulation - Leaves bright/shiny solder joints after reflow - Standard core 66 (3.3 percent flux) ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00068IJWC | | Best Sellers Rank | #41,425 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #90 in Solder | | Date First Available | November 19, 2009 | | Item Weight | 1 pounds | | Item model number | 24-6337-0010 | | Manufacturer | Kester | | Product Dimensions | 2.5 x 2.5 x 2.25 inches | ## Images ![Kester 24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool - Image 1](https://m.media-amazon.com/images/I/510hs-ySFbL.jpg) ![Kester 24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool - Image 2](https://m.media-amazon.com/images/I/81-S5dTsxpL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: Would this work well to solder switches to a PCB on a mechanical keyboard?** A: Yes, this is excellent solder for electrical applications. However, keep in mind this is a large roll that is a lot more then you would need if you are only doing one keyboard. I work on home electronics all the time and still l have a roll I bought at least 3 years ago that I use almost weekly. If you only need a small amount I would recommend you go to sparkfun.com they sell small quantities of solder for small jobs, it may not be Kester brand but it is good solder for your job. **Q: Is this a multicore solder?** A: All Kester Solder products are single core. **Q: The diameter of this solder is less than 1/32?** A: 1/32" is 0.031", so yes, even if it actually measures out to .022" it is smaller than 1/32" This product is available in 0.031" if you prefer a thicker solder. **Q: Does the Kester 44 solder have a shelf life or expire in x number of years?** A: The jist: it lasts forever in a dry, non corrosive environment. The expiration date on the box is for the manufacturers warranty. Here is the document from Kester's website explaining: http://www.kester.com/Portals/0/Documents/Knowledge%20Base/Kester%20Shelf%20Life%20Policies.pdf?ver=2016-09-13-140726-910 ## Frequently Bought Together - Kester 24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool - Thermaltronics TMT-TC-2 Tip Tinner (20g) in 0.8oz Container - SRA Solder 135 Rosin Paste Soldering Flux For Electronics, No Clean Flux Made for Lead and Lead-Free Solder Circuit Boards and Copper Electrical Wire - Safe Clean Residues with No Goopy Mess (2oz Jar) --- ## 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.sk/products/5535679-kester-24-6337-0010-44-rosin-core-solder-63-37](https://www.desertcart.sk/products/5535679-kester-24-6337-0010-44-rosin-core-solder-63-37) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-09-13*