Kester 44 24-6337-0053 Rosin Core Solder 0.050 in
- 0.050 inch (1.27 mm) wire, spool
- Sn63/Pb37 leaded alloy, melting point 183 C (361 F)
- 44 activated rosin core, 3.3 percent flux, core 66
- ROM1 per J-STD-004
- Shelf life 1095 days
- 10.4 oz shipping weight
Last refreshed Sep 28, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A leaded rosin-core solder wire in a thick gauge, with a stated melting point, flux percentage and classification. The shipping weight in the spec table does not match the pound size in the description.
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ASIN: B0180XFIKAModel: 44Category: Solder
Overview
An electronics assembly bench running leaded joints is the setting for this rosin-core wire. The alloy is a tin-lead blend, and the activated rosin flux in the core is rated for production line soldering.
The listing is unusually complete, giving alloy, melting point, flux percentage, classification and shelf life. The limitation is the lead content, a flux residue that resists IPA, and a weight field that disagrees with the description.
Who it's for
Technicians who solder with tin-lead alloy and want documented flux, core and melting data get all of it here. Anyone bound by lead-free rules, or who cleans boards with isopropyl alcohol, should choose differently.
Pros and cons
- Stated alloy composition
- Stated melting point
- Long stated shelf life
- IPA does not remove residue
- Weight field disagrees with description
Performance notes
The activated rosin core flows ahead of the melting alloy, and the description credits the flux with fast wetting and mobility. Residues are non-corrosive and non-conductive, and removal, where needed, calls for a saponifier or a cleaner made for no-clean flux.
Specifications
| Brand | Kester |
|---|---|
| Model | 44 |
| Dimensions & fit | |
| Wire diameter | 0.050 inches (1.27 mm) |
| Core size | 66 |
| Spool size | Spool |
| Item weight | 10.4 ounces |
| Product dimensions | 2.3 x 2.7 x 2.45 inches |
| Capacity & performance | |
| Melting range | 183 C (361 F) |
| Construction & materials | |
| Material | Sn63/Pb37 (63 percent tin, 37 percent lead), leaded |
| Other details | |
| Certification | ROM1 per J-STD-004 |
| Flux content | 3.3 percent |
| Recommended uses | 1095 days |
| Flux type | Rosin core, 44 series |
Frequently asked questions
Is Kester 24-6337-0053 lead-free?
No. The description lists Lead Free: No and a 63 percent tin, 37 percent lead composition.
Can I clean the residue with IPA?
No. IPA will not clean the residues. If removal is required, use a saponifier or a cleaning agent designed for no-clean flux.
Does the residue have to be removed?
The residues are non-corrosive and non-conductive and do not require removal in most applications.
Is this a solder paste?
No. It is solder wire supplied on a spool.