Weller WSW SAC M1 T0051388299 Lead-Free Solder Wire, 0.5 mm, 100 g

Weller WSW SAC M1 T0051388299 is lead-free solder wire with a stated 0.5 mm diameter and 100 g spool. Its tin-silver-copper alloy and 3.5% mildly activated, no-clean flux core suit electronics soldering where fine wire and a flux-cored format are useful.

At a glance

The listing describes a Sn-Ag-Cu lead-free alloy with a 3.5% mildly activated, no-clean flux core.
The stated melting range is 217 to 221°C.
A 0.5 mm wire diameter is suited to controlled feeding for smaller soldering work.

Price

£25.42Save 31%

Reference price: ~~£36.94~~

Price checked: 14 Nov 2026

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Pros and cons

Pros

The fine 0.5 mm wire offers more controlled feeding than thicker solder wire for small joints.
Integrated no-clean flux removes the need to feed a separate flux core during soldering.

Technical specifications

8 specifications

Identity
Brand	Weller
Model	T0051388299

Wire and alloy
Diameter	0.5mm diameter, 100g spool
Alloy composition	Composition 3% Silver (Ag), Copper (Cu) 0.5%, remainder Tin (Sn)
Melting point	Melting point 217 to 221°C
Flux core	Mildly activated, no-clean flux cores (3.5%)

Additional listing details
Weight listed	0.22 Pounds
Material listed	Alloy Steel

What to know before buying

The listing title and features specify a 0.5 mm, 100 g solder wire, but unrelated product-detail fields give 0.3 mm and 500 g. It also lists Alloy Steel as the material and 0.22 Pounds as the weight, which do not clearly describe the stated solder alloy and spool. Confirm the selected listing's size and quantity before purchase.

What’s in the box

Included

1 solder wire

Who is it for?

A good fit for

Electronics soldering where fine 0.5 mm wire and a flux-cored format are useful.
Buyers seeking lead-free tin-silver-copper solder wire in a 100 g spool.

Less suited to

Buyers who need leaded solder or a different alloy composition.
Buyers who require a larger-diameter wire or a confirmed larger spool.

Weller WSW SAC M1 T0051388299 Lead-Free Solder Wire, 0.5 mm, 100 g · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 165 ratings

5 stars80%80%
4 stars7%7%
3 stars6%6%
2 stars2%2%
1 star5%5%

Aggregate customer ratings are mostly five-star, though a smaller spread of lower ratings makes experiences less than uniform. These figures do not explain why customers rated the product as they did. For buyers considering the stated 0.5 mm wire and no-clean flux core, the ratings offer only a broad satisfaction signal, not evidence about soldering performance or the conflicting size details.

Frequently asked questions

Is this solder wire lead-free?

The listing identifies it as lead-free and gives a tin-silver-copper composition.

What are the stated wire diameter and spool weight?

The title and feature text state 0.5 mm diameter and a 100 g spool. Other product-detail fields conflict with these figures, so check the selected listing before ordering.

Does it contain flux?

Yes. The listing describes a 3.5% mildly activated, no-clean flux core.

What is the stated melting range?

The listing gives a melting point range of 217 to 221°C.