Kester 44 24-6337-0010 Rosin Core Solder 1/2 oz
- 63/37 alloy, eutectic, rosin core
- Fine diameter wire, listed as eutectic
- 30 feet packaged as three 10 foot lengths
- 1/2 ounce of solder
- 361 F melting point (183 C)
- 3.3% flux core, ROM1 per J-STD-004
Last refreshed Sep 28, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A fine diameter rosin core solder for electronics, sold in a small quantity of three short lengths. The listing does not name the alloy metals.
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ASIN: B074WB81K4Model: 44Category: Solder
Overview
Melting at a single temperature, this eutectic rosin core solder flows into joints on circuit boards, audio gear, surface mount and through hole work, and cable and connector wiring.
Reason to buy is the match to small electronics work: fine wire, a low melting point and flux with a non-corrosive residue. The limitation is the small quantity, which suits a hobby bench but runs out fast in production.
Who it's for
Makers, students and repair technicians get a small amount of fine wire for boards and connectors. Those soldering heavy pipes, or running a production line, need a different alloy and a bigger spool.
Pros and cons
- Eutectic alloy melts at one point
- Fine diameter wire
- Rosin flux in the core
- Non-corrosive, non-conductive residue
- Small quantity per package
- Alloy metals not named
Performance notes
A eutectic alloy turns from a hard wire to a liquid at one temperature, which gives a quick joint with little time spent in a pasty state. Rosin flux in the core cleans oxide from the metal and lets the solder wet the joint. The flux residue is described as non-corrosive and non-conductive.
Specifications
| Brand | Kester |
|---|---|
| Model | 44 |
| Dimensions & fit | |
| Wire diameter | Fine diameter |
| Item weight | 3 ounces |
| Capacity & performance | |
| Melting temperature | 361 F (183 C) |
| Included components | |
| Packaging | Three lengths of 10 feet each |
| Other details | |
| Alloy ratio | 63/37, eutectic |
| Quantity | 1/2 ounce, 30 feet (9.1 meters) |
| Use | PCB, audio, surface mount, through hole, cable, connector and wire work |
| Flux type | Rosin 44 core, 3.3% |
| Flux classification | ROM1 per J-STD-004 |
Frequently asked questions
Can Kester 44 solder be used on surface mount parts?
The description lists surface mount among its uses, along with PCB, audio, through hole and connector work.
Does Kester 44 63/37 solder contain lead?
The listing gives the alloy ratio but does not name the metals or state lead content.
Is the flux residue on Kester 44 corrosive?
The listing says the flux residue is non-corrosive and non-conductive.
Is Kester 44 solder suitable for plumbing?
No. It is a fine electronics solder with a rosin core, described for boards, audio and connectors.