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 spool of tin-lead solder wire, 0.3 mm diameter, 50 g net weight, rosin flux core

HengTianMei 63/37 Rosin Core Solder Wire 0.3mm 50g

SKU CH-RG5P-3B3DB

Tin-lead rosin-core solder wire with 63/37 alloy, 1.8% flux, 0.3 mm diameter and 183 °C melting point for electronics repair

  • Fit and compatibilityHTMSW63370350
  • Certifications and standardsLead Free Compliant
  • 63/37 alloy ratio melts cleanly at 183 °C
  • 8 % rosin flux core speeds up solder flow
  • 3 mm diameter suits fine-pitch board work
  • 50 g spool fits pocket for field repairs
  • Sn63-Pb37 composition forms strong joints on radios, motors and circuit boards

Solder wire for fine electronics repair

The 0.3 mm rosin-core wire uses a 63/37 tin-lead alloy with 1.8 % flux. Its melting point is 183 °C, allowing quick joints on small pads. The 50 g spool suits hobbyists and technicians working on radios, circuit boards and similar devices.

Upgrade from thicker or lead-free wire

Thicker gauges can bridge fine-pitch pins, while lead-free alloys need higher tip temperatures. This wire replaces both when precision and lower heat are required. The jump is worth it for dense boards, vintage gear repair or any job where a 0.3 mm diameter gives better control.

Steady flow during long sessions

Flux content stays consistent at 1.8 % so wetting remains even across many joints. The alloy melts cleanly at 183 °C without sudden spikes, reducing tip wear during continuous use. The compact reel feeds smoothly for repeated hand-soldering tasks.

How it compares

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

Price $15.99
Cheaper than about 70% of the 802 comparable items (median $25.99).

Specifications

Compatibility
Fit and compatibilityHTMSW63370350
Environment & compliance
Certifications and standardsLead Free Compliant

Questions about this item

What reel diameter and width does the 0.3 mm solder wire come on?

The spool measures 50 mm in diameter and 18 mm wide, which is 1.97 in by 0.7 in.

What temperature should the iron tip reach for this Sn63-Pb37 alloy?

Heat the tip to at least 183 °C (361 °F); the rosin flux activates at that point and the joint flows cleanly.

When will the flux core be exhausted on a 50 g spool?

The 1.8 % rosin core runs the length of the wire; once the 50 g is used up, fresh solder and flux are needed.

More in Soldering Irons & Stations

Similar items