Kester 245 24-6337-8800 No-Clean Solder 5 Pack
- Five 1-pound spools in the pack
- 63/37 alloy, 0.031 inch diameter
- 245 no-clean flux core, classified ROL0 per J-STD-004
- Bellcore GR-78 compliant
- 5.25 pounds total weight
Last refreshed Sep 28, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A five spool pack of no-clean cored solder in the classic electronics alloy ratio for electronics work where cleaning is skipped. Melting range and flux percentage are not listed.
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ASIN: B087PQ3D3MModel: 245Category: Solder
Overview
Joining electronic assemblies without a wash step is the job of this Kester cored wire solder. Its activated rosin core was developed to complement low residue liquid fluxes, and the pack holds five one pound spools.
The reason to buy it is the volume of a known electronics alloy with a no-clean flux that Kester says solders with efficiency comparable to a mildly activated rosin flux. The limitation is the bulk pack of five spools, which is a lot for occasional repair.
Who it's for
Production benches, repair shops and frequent hobbyists get five spools to draw from. Occasional users will find the pack larger than needed, and anyone needing a different alloy ratio or wire diameter should check other part numbers.
Pros and cons
- Activated rosin flux core
- No-clean residue looks acceptable unwashed
- ROL0 flux classification
- Bellcore GR-78 compliant
- Melting range not listed
- Bulk pack suits frequent use only
- Fixed alloy and wire diameter
Performance notes
The rosin core releases flux as the wire melts, cleaning the joint surfaces and helping the solder wet and flow. The no-clean chemistry leaves a residue Kester describes as visually acceptable without washing, while soldering quality is comparable to a mildly activated rosin flux. Joint results still depend on tip temperature and clean parts.
Specifications
| Brand | Kester |
|---|---|
| Model | 245 |
| Dimensions & fit | |
| Wire diameter | 0.031 inches |
| Item weight | 5.25 pounds |
| Capacity & performance | |
| Result | Visually acceptable assemblies without cleaning |
| Included components | |
| Included Components | Five Kester 24-6337-8800 spools, 1 pound per spool |
| Other details | |
| Alloy ratio | 63/37 |
| Certification | ROL0 per J-STD-004, Bellcore GR-78 compliant |
| Flux type | 245 activated rosin core, no-clean |
| Style | 245 flux-cored wire |
Frequently asked questions
Does Kester 245 work with low residue liquid fluxes?
Kester says 245 was developed to complement low residue liquid fluxes used in the electronics industry.
Do I need to clean joints made with Kester 245?
Kester says it results in visually acceptable assemblies without cleaning, with soldering quality comparable to a mildly activated rosin flux.
Does the Kester 24-6337-8800 listing give a melting range?
No. It gives the 63/37 alloy and 0.031 inch wire diameter but no melting range, so check Kester's data sheet for temperature.