Kester 44 24-6337-0010 Rosin Core Solder 1 lb
- 63/37 alloy, fine gauge wire
- Kester 44 activated rosin flux core
- 1 lb spool, part 24-6337-0010
- Fast wetting, fast-spreading flux
- Dimensions 2.5 x 2.5 x 2.25 inches
Last refreshed Sep 28, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A fine-gauge, one-pound spool of rosin-core solder with a long-running activated flux made for production soldering. The listing does not say whether the residue needs cleaning.
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ASIN: B00068IJWCModel: 44Category: Solder
Overview
Feeding a thin wire of solder onto a joint is the job of this spool, with an activated rosin flux running through the core. The flux spreads fast and wets the joint quickly, which suits repeated production line soldering.
Fast wetting and a fine diameter make it practical for repeat joints, and this flux has a long record as an activated rosin core. The limitation is the missing process detail: no flux percentage, melting range or cleaning guidance is given.
Who it's for
Operators who solder many joints a day and want a flux that wets fast will find the spool suited to that rhythm. A buyer working to a no-clean process should check the residue handling before choosing it.
Pros and cons
- Fine wire for small joints
- Activated rosin flux wets fast
- One pound spool
- Long-running flux formula
- Cleaning guidance not listed
- Melting range not listed
- Flux percentage not listed
Performance notes
The activated rosin flux in the core lifts oxide from the joint as the solder melts, and its high mobility spreads it across the surface quickly. That fast wetting behavior is what makes production line results more repeatable. The thin wire feeds in small amounts.
Specifications
| Brand | Kester |
|---|---|
| Model | 44 |
| Dimensions & fit | |
| Wire diameter | Fine gauge |
| Item weight | 1 pound |
| Product dimensions | 2.5 x 2.5 x 2.25 inches |
| Construction & materials | |
| Material | 63/37 |
| Other details | |
| Item model number | 24-6337-0010 |
| Flux type | Kester 44 activated rosin core |
Frequently asked questions
What size and alloy is it?
The alloy is 63/37 on a 1 lb spool, and the title gives a fine wire diameter.