Kester 24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool

Description

Product Overview

The Kester 24-6337-0010 44 Rosin Core Solder is a trusted solution that has been the industry standard for decades. It combines a 63/37 tin‑lead alloy with a high‑activity rosin core, delivering a balance of fluidity and wetting ability that produces bright, shiny joints after reflow. Each spool contains one pound of solder wire, measured at .020 inch diameter, making it ideal for both fine‑pitch work and larger connections. The solder is packaged in a compact, resealable spool that protects the wire from oxidation while providing easy access for continuous feeding during soldering projects.

Designed for a broad spectrum of applications, this solder works equally well on printed circuit boards, wire‑to‑wire connections, and component leads. Its formulation ensures excellent solderability across a wide variety of metallizations, including copper, nickel, and gold finishes. The rosin core is formulated to be highly active, promoting rapid flux action without leaving excessive residues, which helps maintain the reliability of the final assembly. With a proven track record and a customer rating of 4.8 out of 5 stars from nearly 700 reviews, the Kester 44 Rosin Core Solder offers confidence for hobbyists and professionals alike.

Usage

This solder is perfectly suited for a range of environments, from home workshops to industrial production lines. Whether you are assembling a prototype board, repairing a broken connector, or performing large‑scale manufacturing, the 1 lb spool provides enough material to complete multiple projects without frequent reloading. The .020 inch diameter wire offers a comfortable balance between ease of handling and precision, allowing you to tackle delicate surface‑mount components as well as heavier through‑hole parts. The rosin core activates at typical soldering temperatures, ensuring clean, reliable joints even when working with complex assemblies that require multiple reflows.

For hobbyists, the solder’s bright finish and low smoke generation make it a pleasant choice for extended use in small spaces. Repair technicians appreciate the consistent melt flow and the ability to quickly re‑tack components without excessive bridging. In professional settings, the solder meets the stringent requirements of aerospace, automotive, and consumer electronics manufacturers who demand repeatable performance and minimal post‑process cleaning. Its compatibility with standard soldering irons, hot‑air reflow stations, and wave soldering equipment further expands its versatility across different production methods.

Why Choose Us

Choosing Kester means selecting a brand with a legacy of quality and reliability. Every spool undergoes rigorous testing to verify alloy composition, flux activity, and mechanical properties, ensuring that the product meets or exceeds industry specifications. The 63/37 tin‑lead ratio provides a low melting point while maintaining strong mechanical strength, which is essential for both rapid prototyping and long‑term durability. Our high‑activity rosin core is engineered to reduce oxidation and improve wetting, resulting in joints that are both aesthetically pleasing and electrically sound.

Beyond the product itself, Kester offers comprehensive technical support and a responsive customer service team. If you encounter any issues or have questions about optimal soldering parameters, our experts are available to provide guidance tailored to your specific application. Additionally, the product is backed by a satisfaction guarantee, reinforcing our commitment to delivering value and performance. By partnering with Kester, you gain access to a trusted supply chain, consistent product availability, and the peace of mind that comes from using a component trusted by engineers worldwide.

Key Features

• Industry‑standard 63/37 tin‑lead alloy for low melt temperature and strong joints
• High‑activity rosin core ensures rapid flux action and bright, shiny finishes
• 1 lb spool provides ample material for multiple projects, reducing downtime
• Compatible with a wide range of metals, delivering excellent solderability on copper, nickel, and gold
• Backed by Kester technical support and a satisfaction guarantee for reliable after‑sales service

FAQ

What size spool does this solder come in?

The product is supplied in a 1 lb (approximately 0.45 kg) spool of .020 inch diameter solder wire. This size is convenient for both small‑scale hobby projects and larger production runs, offering enough material to complete multiple assemblies without frequent reloading.

Is this solder suitable for lead‑free applications?

No. The Kester 44 Rosin Core Solder is a tin‑lead alloy (63% tin, 37% lead) and is intended for applications where leaded solder is acceptable. For lead‑free requirements, Kester offers alternative formulations that meet RoHS compliance.

How does the rosin core affect cleaning after soldering?

The high‑activity rosin core is designed to provide effective flux action during soldering while leaving minimal residue. In most cases, a light solvent wipe or a brief isopropyl alcohol rinse is sufficient to remove any remaining flux, making post‑process cleaning quick and easy.

Can this solder be used with wave soldering equipment?

Yes. The 63/37 alloy composition and rosin core formulation are compatible with wave soldering processes. The solder’s low melt point and consistent flux activity help achieve uniform wetting across large batches, making it a reliable choice for automated production lines.

What are the recommended storage conditions?

Store the spool in a cool, dry environment away from direct sunlight and moisture. Keeping the solder in its original sealed packaging until use helps preserve the rosin activity and prevents oxidation, ensuring optimal performance when you are ready to solder.