# 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.

- [Original product page](https://bargainpostbox.co.uk/product/weller-wsw-sac-m1-t0051388299-solder-wire)
- [View offer](https://bargainpostbox.co.uk/visit/weller-wsw-sac-m1-t0051388299-solder-wire)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: Weller
- Model: T0051388299
- Category: Tools & Garden > Hardware & Building Materials
- Price: 25.42 GBP
- Previous price: 36.94 GBP
- Discount: 31%
- Price checked: 2026-11-14T09:53:35.342Z
- Rating: 4.5 / 5
- Reviews: 165

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## 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.

## 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.

## 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

## Before you buy

- 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.

## In the box

- 1 solder wire (Included)

## 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.

## Customer feedback

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.

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## Images

![Weller WSW SAC M1 T0051388299 Lead-Free Solder Wire, 0.5 mm, 100 g — 1](https://bargainpostbox.co.uk/i/j26_LGcPNjMYZAMcowV0a5HeApvOwfNUsXX-D1OiZdpuQQMakekmy1pDe2pccNs80-YIAPdLnvZK7mEyKaRbcuQnwDpI0YmM13yG-WYOxU136ZY1RR7kdf7i.jpg)

![Weller WSW SAC M1 T0051388299 Lead-Free Solder Wire, 0.5 mm, 100 g — 2](https://bargainpostbox.co.uk/i/1KigkVua927PwTh4wSCBx3bHlynqgNa_qwXbBmfJ3CZ_9S_0B6UOwjAy_Wq5D0X3uFv2dx6Z4ZFGZKO9_Yj7vknwxxyd7YoscQjo-Zyl8WJAcD5FnVGJ9Whm.jpg)

![Weller WSW SAC M1 T0051388299 Lead-Free Solder Wire, 0.5 mm, 100 g — 3](https://bargainpostbox.co.uk/i/z1D96EHklDnqzMRCUSFnfLEV9lb-5bH6p9CQlW3ICJjZVN6bFoNLJjIxrCvy42vf1AaB3_aA15stP8tHyaArZ4mb3E2YD1-Dh9oR47M-txPvok2jIN7Lh2hG.jpg)

![Weller WSW SAC M1 T0051388299 Lead-Free Solder Wire, 0.5 mm, 100 g — 4](https://bargainpostbox.co.uk/i/K7KdnM6gzFtfl4MCrkT6Q3mzOsDkOS98iTWRv0NoSQGd8Sp8m-6_p1DOo-4WPqsMLMA0n7HrBg1cgv996cybNgK-0gt3DblyK4GXzwONs6cZ9GsnNMDTKC51.jpg)

![Weller WSW SAC M1 T0051388299 Lead-Free Solder Wire, 0.5 mm, 100 g — 5](https://bargainpostbox.co.uk/i/PX8k4hmK-gz5x35HebIv1iPO_KEN4l39B5fyzucFOuQWXuqX3Vl763mf5fyZ4587Fq-AXOZyBntMuaVAvwzA9UBPBIswUCqeUY3cDHlrMDjSx5wgAmz7z3E_.jpg)

![Weller WSW SAC M1 T0051388299 Lead-Free Solder Wire, 0.5 mm, 100 g — 6](https://bargainpostbox.co.uk/i/jL2Z1DwFNEjUnTvCPuZjRW0lynyBBUC8t5AQ-lYJJzzQeBbdo11dREU9iwEvew7anU69QHww7kNEnvF154_iSUp-plikKTXYs2_YIScJfCPHp578F5WYkygT.jpg)

![Weller WSW SAC M1 T0051388299 Lead-Free Solder Wire, 0.5 mm, 100 g — 7](https://bargainpostbox.co.uk/i/RlKfP7WhNspWA0FA3EVoVI_FB3TawIdjJgmnHHW_os2fIeRcrMGkc3AQS2Tgy1Hj4tQP-qhyoZyYw0xEdN7xpvm5pKiREhcCaedGu5MjavP-TgsblZ5ac6Q1.jpg)