Kester 44 24-6040-0018 Rosin Core Solder 0.025 in
- 0.025 inch wire in the title, spec table rounds it to 0.03 inches
- Kester 44 activated rosin flux in the wire core
- 1.1 lb roll, single wire
- Tin material, alloy ratio not stated
Last refreshed Sep 28, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A rosin-core solder roll with an activated flux made for fast wetting on production soldering. Alloy ratio and melting range are not given, so check them against your joint before ordering.
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ASIN: B004X4KWPCModel: 44Category: Solder
Overview
A production soldering line is the setting this roll is made for. The wire carries Kester activated rosin flux in its core, so flux reaches the joint as the solder melts.
Flux-cored wire removes a separate fluxing step, and the activated rosin formula spreads quickly across the joint, which supports repeatable results on a line. The limitation is missing data: the alloy ratio and melting range are absent, and the diameter reads differently in the title and spec table.
Who it's for
Technicians making repeat joints gain from flux already inside the wire and a fast-spreading action. Anyone who needs a confirmed alloy or a lead-free claim should look for a listing that states it.
Pros and cons
- Activated rosin flux in the core
- Fast-spreading wetting behavior
- Flux formula in use for decades
- Alloy ratio not listed
- Diameter differs between title and specs
- No melting range given
Performance notes
Activated rosin in the core flows ahead of the solder as the joint heats, which is what the fast wetting behavior describes. Wire diameter sets how much solder lands per feed, so a thin wire gives finer control over the amount delivered.
Specifications
| Brand | Kester |
|---|---|
| Model | 44 |
| Dimensions & fit | |
| Wire diameter | 0.025 inches (title); spec table 0.03 inches |
| Item weight | 1.1 pounds |
| Construction & materials | |
| Material | Tin |
| Color | Silver |
| Included components | |
| Unit Count | 1 Count |
| Other details | |
| Number of Items | 1 |
| Flux | Rosin cored |
| Flux type | Activated rosin (Kester 44) |
| Wire Gauge | 22 awg, 23 swg and core size: 3.3 percent |
Frequently asked questions
Is this Kester wire meant for plumbing pipe?
The description points to production line soldering with rosin flux. It does not mention pipe or sheet metal use.
What diameter is the Kester 44 roll?
The title says 0.025 inch, while the spec table shows 0.03 inches.
Do I need to add separate flux?
The flux is cored into the wire, as the description explains, so a separate flux step is not part of the described use.