Kester Solder
Kester Solder Sn63Pb37 RA #66/44 .015" 24-6337-0007 soldering
63/37 tin-lead solder wire with RA flux core, .015" diameter for fine electronic hand soldering
- Fine .015" wire suits dense PCB work
- 63/37 tin-lead alloy melts at 183-190 °C
- RA #44 flux gives instant wetting action
- Regular 66 core with 3.3 % flux by weight
- 1 lb spool supports extended production runs
Sn63Pb37 alloy with RA flux
This 1 lb spool of Kester solder wire uses a 63% tin and 37% lead alloy that melts between 361 and 374 degrees Fahrenheit. The rosin-activated flux core is sized at 66 for regular 3.3% flux content by weight. It is formulated for production line and hand soldering tasks. The product is not RoHS compliant due to its lead content.
.015 inch diameter for fine joints
The wire measures .015 inches or 0.40 millimetres in diameter, matching 28 gauge thickness for precise work on small pads. This thin profile suits dense circuit boards and delicate component leads. The regular core size 66 delivers consistent flux flow during each joint. Builders needing heavier wire for large connectors or power cables will find this diameter too slight.
Industry standard 44 flux formula
Kester "44" rosin-activated flux provides instant wetting action for reliable electrical connections. The flux chemistry is the recognised benchmark for hand soldering in electronics assembly. No additional flux or cleaning agents are bundled with the spool. Users requiring water-soluble or no-clean flux types must source a different product.
Highlights
- Fine .015" wire suits dense PCB work
- 63/37 tin-lead alloy melts at 183-190 °C
- RA #44 flux gives instant wetting action
- Regular 66 core with 3.3 % flux by weight
- 1 lb spool supports extended production runs
Specifications
| Brand | Kester |
|---|
Questions about this item
What does the Sn63/Pb37 alloy mean for the melting range?
The 63% tin and 37% lead alloy melts between 183°C and 190°C, or 361°F to 374°F.
What diameter tip or feeder works with the .015 inch wire?
The wire is .015 inch diameter, which is 0.40 mm or 28 gauge, so size your iron tip and feeder for that thickness.
How do I avoid flux spatter when hand-soldering with the RA #66 core?
Feed the solder to the joint, not the iron tip, and let the 3.3% rosin-activated flux activate on the heated pad to prevent spatter.
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