Kester 44 60/40 Rosin Solder Wire 3/4 oz Tube
- 60/40 alloy solder, **0.025 inch** wire
- RMA rosin flux, standard Core 66 (3.3% flux)
- 315 to 371 C (600 to 700 F) iron tip range
- 3/4 ounce tube, one per pack
- Non-corrosive, non-conductive flux residue
Last refreshed Sep 28, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A small repackaged tube of Kester 44 cored solder for electronics hobby work. It is sold in a tube, not on the factory spool, so it is a convenience size.
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ASIN: B0FMYRPD79Model: 44Category: Solder
Overview
Not a lead-free paste or a bulk spool, this is cored solder wire with an activated rosin flux in the center. Kester 44 is the formula named, and here it is repackaged from a bulk roll into a small tube.
The reason to buy is a small quantity of genuine Kester wire for repairs and soldering practice. The limitation is that the seller repackaged it from a bulk roll, and the listing gives no tube length or box contents beyond the tube.
Who it's for
People doing occasional electronics repairs or kit builds who want a small tube instead of a pound spool. A production user who solders daily should buy a larger quantity.
Pros and cons
- Rosin flux core
- Genuine Kester 44 formula
- Small convenience quantity
- Standard core flux level
- Lead-free status not stated
- Repackaged from a bulk roll
Performance notes
The rosin flux in the core cleans the joint as the solder melts, and the stated iron tip range gives the working temperature. The flux residue is described as non-corrosive and non-conductive. The thin wire diameter is listed in the specs.
Specifications
| Brand | Kester |
|---|---|
| Model | 44 |
| Dimensions & fit | |
| Wire diameter | 0.025 inch |
| Item weight | 3/4 ounce tube |
| Capacity & performance | |
| Iron tip temperature | 315 to 371 C (600 to 700 F) |
| Construction & materials | |
| Material | 60/40 |
| Other details | |
| Flux content | Core 66, 3.3% |
| Flux type | RMA rosin, activated |
| Source part | Kester 24-6040-0018 |
Frequently asked questions
What comes in the Kester 44 solder pack?
One 3/4 ounce tube of solder wire, repackaged from a bulk roll of Kester 24-6040-0018.
What iron temperature should I use with Kester 44?
The seller copy gives 315 to 371 C (600 to 700 F) at the iron tip.