We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Kester Sn63Pb37 RA #66/44 .015 inch solder wire spool

Kester Solder

Kester Solder Sn63Pb37 RA #66/44 .015" 24-6337-0007 soldering

SKU CH-ZSX3-8DQ16

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.

How it compares

Measured against everything we stock in Soldering Irons & Stations, at today’s prices. Recalculated every night.

Price $76.99
Pricier than about 80% of the 802 comparable items (median $25.99).

Specifications

Product
Brand nameKester

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.

More in Soldering Irons & Stations

Similar items