Search  for anything...
SainSmart

SainSmart 0.8mm Solder Wire 63/37 Tin/Lead Sn63Pb37 with Flux Rosin Core

  • Based on 1,485 reviews
Condition: New
Checking for the best price...
$15.99 Why this price?

Buy Now, Pay Later

As low as $3 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Thursday, Oct 29
Order within 14 hours and 43 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Size: 0.8mm/100g


Features

  • Advantage: 37% lead content effectively lowers melting point and improves the soldering gloss, also saves your work time.
  • Size: Inside with rosin core, it weighs 100g/ 0.22lbs; The size of solder wire roll is 5.4 x 5.4 x 5.1cm/ 2.1 x 2.1 x 2.0 inches; The diameter of the electrical soldering wire is 0.8mm/ 0.031 inches.
  • Composition: Sn: 63%; Pb: 37%; Flux: 2%.
  • Physical Performance: Its melting point is 183C(361F); Good fluidity, heats evenly, good thermal and electrical conductivity.
  • Wide Application: Perfect for electric soldering and wire connections. Such as micro-soldering on the motherboard, SMD soldering, radios, VCRs, stereos, wires, motors, circuit board. Suitable for household electricals repairing, DIY, cable reparation, circuit repairing.

Description

Specifications: Lead Content: 37%; Sn Content: 63% Flux: 2% Gross Weight: 100g/0.22lbs Diameter: 0.8mm Melting point: 183°C(361℉) Package List: 1 x SainSmart 0.8mm Solder Wire (100g)

Material: 63/37 Tin/Lead


Brand: SainSmart


Finish Type: Polished


Item Weight: 100 g


Recommended Uses For Product: electric soldering and wire connections


Brand Name: SainSmart


Recommended Uses For Product: electric soldering and wire connections


Number of Items: 1


Item Highlight: For Electrical Soldering (100g /0.22lbs)


Manufacturer: SainSmart


Number of Packs: 1


Model Number: 0.8mm/100g


Part Number: 0.8mm/100g


Item Weight: 100 g


Item Diameter: 0.8 millimeters


Wire Diameter: 0.8 millimeters


Item Thickness: 0.8 millimeters


Finish Type: Polished


Item Shape: Round Rod


Item Form: Coil


Material: 63/37 Tin/Lead


Grade Rating: Industrial


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Oct 29

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Excellent Solder Wire
Size: 0.6mm/100g
The 0.6mm diameter is perfect for precision work — thin enough for fine-pitch components and SMD soldering, but still has enough mass to handle slightly larger joints without needing to feed too much wire. The 63/37 alloy melts beautifully at a low temperature and gives that smooth, shiny flow I love to see. No cold joints, no hassle. Cleanup is minimal, and I’ve had zero issues with corrosion. This stuff melts and flows like butter compared to some of the cheaper lead-free stuff I’ve used in the past. It wets pads and component leads extremely well, and the smoke smells like classic rosin. If you’re looking for reliable, high-quality solder that performs like the old Kester stuff but at a better price, look no further. SainSmart nailed it with this one. ... show more
Reviewed in the United States on June 30, 2026 by Dutchy
    • Good!
Size: 0.6mm/100g
This is really good solder of a difficult size to find in a standard lead-based solder. At least where I am anyhow. It works really well and right now is available at a good price.
Reviewed in the United States on May 3, 2026 by Ohio guy
    • Great value
Size: 0.8mm/100g
I wanted some decent solder that would actually flow and melt at the temps I use and I can say this solder exceeded expectations. This melts extremely well and has good flow into joints and doesnt leave a dry joint. Great product.
Reviewed in the United States on September 27, 2024 by timcanfixit
    • Works, but for me I prefer other brands
Size: 0.6mm/100g
I personally don't love working with this stuff compared to others. But it is well liked by plenty of youtubers who have more experience than I do. I just find it is really smokey and doesn't jump over well when soldering from your gun to whatever it is you're soldering. I found that others just melted better and faster and were easier to work with. i wasn't doing micro soldering though mostly larger stuff. ... show more
Reviewed in the United States on April 25, 2026 by The Car Mechanic
    • Good solder, great price.
Size: 0.6mm/100g
I am using this for electronics repair. First use left me impressed with the good quality of this The melting point is good, the flow is good and the adherence is good. I have not done any mechanical testing on joints but I expect it is fine. I used it to repair a broken game cartridge last night and it worked. This solder did not seem to melt or flow at a noticeably different rate from what Nintendo originally used. ... show more
Reviewed in the United States on February 4, 2020 by Matthew
    • works great with good tip
Size: 0.6mm/100g
Large pad, small pad, high heat, low heat, tinning, or whatever I'm doing, this solder flows well and leaves a great connection. I solder small FPV (drones) circuit boards often so good solder makes things easy, but bad solder makes things miserable. I haven't had a bad solder yet with this spool. Full disclosure, I also use a SainSmart soldering workstation set which holds everything securely. So my hands are free with this solder in my left hand, the solder gun in my right pre-tinned with a tiny bit of solder on the lower side, and rub around 350-400 C. The board and wire are securely held with zero movement. Iron's tip touches pad for 1/2 sec, solder from spool touches pad, flows right on, pull both back right away, and wait for cooling before moving anything else. Perfect every time. ... show more
Reviewed in the United States on September 16, 2023 by John Schubert
    • Love it!
Size: 0.6mm/100g
Solder works really well. I’m happy with it. Leaves a nice shine look. I recommend!
Reviewed in the United States on November 29, 2025 by Tech Bear
    • Quality
Size: 0.8mm/100g
This is the best solder I have used for surface mount. A little dab of flux and my Weller set at 625-650 degress and it flows smoothly. Remember a little goes a long way with surface mount components and dont forget to use a good quality flux. I bought solder of Ebay and it was crap. Jeff Kd4lyh
Reviewed in the United States on April 23, 2022 by Jeff

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...