Kester 44 63/37 Rosin Solder Wire 1/2 oz Tube
- 63/37 tin-lead, 0.015 inch wire
- 1/2 ounce tube, 56 feet of wire
- RMA activated rosin, core 66 with 3.3 percent flux
- Iron tip 315 to 371 C (600 to 700 F)
- Industrial use only, experienced technicians
Last refreshed Sep 28, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A half-ounce tube of leaded rosin-core solder for fine-pitch electronics, PCB assembly, repair and rework. The listing carries strict warnings, and its weight and diameter fields conflict with the title.
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ASIN: B017WK9HQSModel: 44Category: Solder
Overview
Kester repackages its rosin-core wire in a small tube meant for fine-pitch electronics work, PCB assembly, repair and rework. The activated rosin formula is sold in smaller quantities from bulk for convenience.
A small tube suits occasional repairs, and the flux residue is described as non-corrosive and non-conductive. The limitation is data quality, since the weight reads over a pound, the diameter reads wider in the spec table, and the material field says lead alone.
Who it's for
Technicians doing fine-pitch repair and rework in small batches get a compact, fine-gauge tube. Hobbyists without ventilation and buyers bound to lead-free rules should choose something else.
Pros and cons
- Fine wire for small joints
- Non-corrosive flux residue
- Stated iron temperature range
- Weight field conflicts with tube size
- Diameter differs between title and specs
- Limited to industrial use
Performance notes
The activated rosin core releases flux ahead of the melting alloy, and the iron tip should run within the stated range. The listing warns that flux fumes may cause pulmonary irritation or damage, so ventilation, eye protection and the safety data sheet matter.
Specifications
| Brand | Kester |
|---|---|
| Model | 44 |
| Dimensions & fit | |
| Wire diameter | 0.015 inches per title; spec table lists 0.02 inches |
| Item weight | 1/2 ounce tube |
| Wire length | 56 feet |
| Construction & materials | |
| Material | 63/37 tin-lead |
| Other details | |
| Flux content | 3.3 percent |
| Recommended uses | Fine-pitch electronics work, PCB assembly, repair or rework |
| Use | 315 to 371 C (600 to 700 F) |
| Flux type | RMA activated rosin, core 66 |
Frequently asked questions
How should Kester 44 tube solder be handled safely?
The listing advises safety glasses, adequate ventilation and avoiding flux fumes, and tells buyers to read the Kester Safety Data Sheet. It gives no storage steps.
How much solder is in the tube?
The spec table lists 56 feet of wire in a 1/2 ounce tube.
Is this Kester 44 wire lead-free?
No. It is listed as 63/37 tin-lead.
Why does the weight say 1.1 pounds?
The title says a 1/2 ounce tube, so the 1.1 pound weight field looks like an error.