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
Small silver-grey solder wire spool, 0.8mm diameter, 50g rosin core

Lead-Free Solder Wire Sn99 Ag0.3 Cu0.7 0.8mm 50g Rosin Core

SKU CH-NEW4-5GSJX

Lead-free solder wire with 0.8 mm diameter, Sn99 Ag0.3 Cu0.7 alloy and rosin core melts at 419 °F for clean electronics joints

  • Fit and compatibilityCopper, Electronics Soldering
  • Certifications and standardsSolder Wire with flux, Lead Free, Diameter 0.8 mm/0.032 in,
  • Lead-free Sn99 Ag0.3 Cu0.7 alloy meets RoHS requirements for electronics work
  • 8 mm diameter and 2.5 % flux core suit fine-pitch components and MCUs
  • Melting point of 419 °F works with all common soldering tools
  • Rosin core flows well without extra flux for PCB, connector and wire joints
  • 50 g spool provides enough wire for DIY, rework and repair tasks

Lead-Free Solder for Electronics

This lead-free solder wire uses a Sn99 Ag0.3 Cu0.7 alloy with a rosin core for electronics soldering. It suits hobbyists, technicians and anyone needing RoHS-compliant joints on copper pads or component leads. The 0.8 mm diameter works well on small parts and fine-pitch connections.

Rosin-Core Wire on 50 g Spool

The flux core contains 2.5 % rosin so no separate flux is required during everyday soldering. A standard spool holds 50 g of wire and feeds cleanly from the reel during hand soldering or light rework. Melting point is 419 °F, compatible with common soldering irons and stations.

Upgrade from Leaded or Thicker Wire

Replaces traditional leaded solder when lead-free compliance is required for commercial or residential equipment. The finer 0.032 in diameter improves control on dense boards compared with thicker wire. Not suited for plumbing, sheet-metal work or high-volume production that demands larger spools or different alloys.

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

Compatibility
Fit and compatibilityCopper, Electronics Soldering
Environment & compliance
Certifications and standardsSolder Wire with flux, Lead Free, Diameter 0.8 mm/0.032 in, weight 50g 0.11 lb

Questions about this item

What diameter is the Sn99 Ag0.3 Cu0.7 solder wire and how does that affect fine-pitch work?

The wire is 0.8 mm (0.032 in) thick, letting it reach tight pads on small components and MCUs without bridging.

What spool weight and flux percentage are supplied, and will it fit a standard benchtop holder?

Each spool holds 50 g (0.11 lb) of wire with 2.5 % rosin core, a common size that fits most desktop dispensers.

At what temperature does this alloy melt, and what iron setting prevents cold joints?

The alloy melts at 419 °F, so set the iron a little above that point and feed wire to the joint, not the tip, to avoid cold solder.

More in Soldering Irons & Stations

Similar items