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A small spool of 0.8 mm silver solder wire with rosin core, 50 g net weight

Wire 63/37 Alloy Rosin Core Soldering Wire 0.8mm 50g

SKU CH-5J3V-K693K

63/37 rosin-core solder wire melts at 183 °C with 2.0 % flux for clean joints on circuit boards and small electronics

  • 63/37 eutectic alloy melts cleanly at 183 °C for fast, strong joints
  • 0 % rosin flux core gives no-clean, oxidation-free soldering
  • 8 mm diameter suits fine circuit-board work and small components
  • 50 g spool is pocket-sized for bench or field repairs
  • Low-smoke formulation keeps workspace air clearer during extended sessions

Alloy Composition & Melting Point

This solder wire uses a Sn63-Pb37 eutectic alloy that melts at 183 °C or 361 °F. The 2.0 % rosin flux core cleans oxidation as it flows, producing clean joints without separate flux application. The 0.8 mm diameter suits fine-pitch work on circuit boards and small component leads.

Capacity & Practical Limits

A 50 g spool provides enough material for dozens of typical hobby or repair joints, while the gross weight of 0.11 lbs keeps the reel pocket-sized for bench or field use. The eutectic composition eliminates a pasty range, so the solder solidifies instantly once heat is removed, but the lead content restricts use where RoHS compliance is required.

Handling & Daily Use

The rosin core generates less visible smoke than many alternatives, helping maintain a clearer workspace in studios, classrooms or home benches. Wire stiffness at this diameter feeds easily by hand yet holds shape for precise placement on dense boards. California Proposition 65 warnings apply due to lead exposure risk, so ventilation and hand washing are advised during regular use.

How it compares

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

Price $12.99
Cheaper than about 80% of the 802 comparable items (median $25.99).

Specifications

No published specifications for this item yet.

Questions about this item

How does the 0.8 mm diameter and 183 °C melting point behave with an older low-wattage pencil iron?

The eutectic 63/37 alloy melts sharply at 183 °C, so even a modest iron reaches flow temperature quickly; the thin 0.8 mm wire feeds easily through fine tips without demanding high thermal mass.

What visual cues confirm the 2.0 % rosin core is activating correctly during a joint?

You should see a brief, clear flux bubble around the pad as the wire hits 183 °C, followed by a shiny, concave fillet with no dull grey crust — the low-smoke 63/37 alloy leaves minimal residue when the flux has done its job.

Does the 50 g spool include any flux pen, tip cleaner or spare tips, or must those be purchased separately?

Only the 50 g roll of 0.8 mm Sn63-Pb37 rosin-core wire is supplied; no flux pen, tip cleaner or spare tips are included, so plan to buy those separately if your workbench lacks them.

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