--- product_id: 5535679 title: "24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool" brand: "kester" price: "€ 102.31" currency: EUR in_stock: true reviews_count: 8 category: "Kester" url: https://www.desertcart.hr/products/5535679-24-6337-0010-44-rosin-core-solder-63-37-020 store_origin: HR region: Croatia --- # Instant-action wetting Bright, shiny joints Industry-standard reliability 24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool **Brand:** kester **Price:** € 102.31 **Availability:** ✅ In Stock ## Summary > ⚡ Solder smarter, shine brighter — the pro’s choice for flawless connections! ## 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?** € 102.31 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/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 - • **Optimized Flux Core:** High-activity rosin flux ensures clean, reliable connections with minimal residue. - • **Trusted for Decades:** Join the millions who rely on Kester’s proven rosin core formula since 1970s. - • **Unmatched Wetting Speed:** Experience lightning-fast solder flow that keeps your projects moving. - • **Perfect for Precision Work:** Fine .020 inch diameter wire ideal for detailed electronics and delicate assemblies. - • **Brilliant Finish Every Time:** Achieve professional-grade, shiny solder joints that impress at first glance. ## Overview Kester 24-6337-0010 is a 1 lb spool of 63/37 tin-lead rosin core solder wire with a .020 inch diameter, featuring a high-activity rosin flux formula that delivers instant wetting and bright, shiny joints. Trusted by professionals for over four decades, it ensures reliable, clean soldering across a wide range of metallizations, making it the go-to standard in electronics 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: Best electric solder out there - This stuff is awesome. Top tier when it comes to solder 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. ## 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 | #38,611 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #96 in Solder | | Date First Available | November 19, 2009 | | Is Discontinued By Manufacturer | No | | Item Weight | 1 pounds | | Item model number | 24-6337-0010 | | Manufacturer | Kester | | Product Dimensions | 2.5 x 2.5 x 2.25 inches | ## 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) ## 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 ## Customer Reviews ### ⭐⭐⭐⭐⭐ Best electric solder out there *by S***M on December 15, 2025* This stuff is awesome. Top tier when it comes to solder ### ⭐⭐⭐⭐⭐ 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. ### ⭐⭐⭐⭐⭐ Great product! *by E***S on March 14, 2025* Great product, worked very good for my detailed projects. This will likely last me near a lifetime! ## 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.hr/products/5535679-24-6337-0010-44-rosin-core-solder-63-37-020](https://www.desertcart.hr/products/5535679-24-6337-0010-44-rosin-core-solder-63-37-020) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-13*