--- product_id: 5535679 title: "24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool" brand: "kester" price: "AR$250947" currency: ARS in_stock: true reviews_count: 8 category: "Kester" url: https://www.desertcart.com.ar/products/5535679-24-6337-0010-44-rosin-core-solder-63-37-020 store_origin: AR region: Argentina --- # Instant-action wetting Bright, shiny joints Industry standard for 40+ years 24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool **Brand:** kester **Price:** AR$250947 **Availability:** ✅ In Stock ## Summary > ⚡ Solder smarter, shine brighter — join the pros who never settle. ## Quick Answers - **What is this?** 24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool by kester - **How much does it cost?** AR$250947 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/5535679-24-6337-0010-44-rosin-core-solder-63-37-020) ## 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. Review: Fantastic Solder - I started getting back into soldering, hadn't done it since high school and I really missed it. I did some research online and found this. I am very happy with this solder, I got a holder for it too and it's the center of my workbench. Don't forget to turn your soldering iron up! I have a Pinecil, I find that +/- 640 degrees Fahrenheit works like a charm. The solder melts quickly and forms shiny, neat pads where I need them. A little bit of rosin flux goes a long way too! The price is worth it for this mighty spool. Review: Best. Solder. Ever. - I cannot state that enough - it really is the best. Throw the lead-free in the trash and get this. You will not be disappointed. It melts like butter, amazing flow and leaves a nice perfect shine. It’s also easy to clean up with alcohol after soldering. You get so much for the $$ in both quality and quantity. It is a LOT of solder! ## 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 | |---------------|-------| | Customer Reviews | 4.9 out of 5 stars 711 Reviews | ## Images ![24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool - Image 1](https://m.media-amazon.com/images/I/81-S5dTsxpL.jpg) ## 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 ## Customer Reviews ### ⭐⭐⭐⭐⭐ Fantastic Solder *by G***. on January 26, 2025* I started getting back into soldering, hadn't done it since high school and I really missed it. I did some research online and found this. I am very happy with this solder, I got a holder for it too and it's the center of my workbench. Don't forget to turn your soldering iron up! I have a Pinecil, I find that +/- 640 degrees Fahrenheit works like a charm. The solder melts quickly and forms shiny, neat pads where I need them. A little bit of rosin flux goes a long way too! The price is worth it for this mighty spool. ### ⭐⭐⭐⭐⭐ Best. Solder. Ever. *by L***M on June 10, 2024* I cannot state that enough - it really is the best. Throw the lead-free in the trash and get this. You will not be disappointed. It melts like butter, amazing flow and leaves a nice perfect shine. It’s also easy to clean up with alcohol after soldering. You get so much for the $$ in both quality and quantity. It is a LOT of solder! ### ⭐⭐⭐⭐⭐ Alpha Solder *by M***L on November 21, 2024* Wow, a one-pound roll of this stuff is worth every dime it cost! Not just because it solders so well, but also because it's made in a western country where it's less apt to have toxic chems in some mystery flux brew. It has an IEC rating of ROM1, which is a moderately active rosin flux with halides. A whole pound is a lot for a hobbyist, but it's stored in a wide mouth mason jar with a bag of desiccant, so it'll do non-iso work for decades. ## 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.com.ar/products/5535679-24-6337-0010-44-rosin-core-solder-63-37-020](https://www.desertcart.com.ar/products/5535679-24-6337-0010-44-rosin-core-solder-63-37-020) --- *Product available on Desertcart Argentina* *Store origin: AR* *Last updated: 2026-09-23*