# Weller SI120 T0051807799 120 W Soldering Iron

T0051807799: The Weller SI120 is a corded, 120 W heavy-duty soldering iron intended for professional and light industrial work. Its listed bent, nickel-plated 12.5 mm tip and mains connection suit demanding tasks such as sheet-metal work, but the listing does not establish temperature control or a stand-alone temperature adjustment feature.

- [Original product page](https://bargainpostbox.co.uk/product/weller-si120-t0051807799-soldering-iron)
- [View offer](https://bargainpostbox.co.uk/visit/weller-si120-t0051807799-soldering-iron)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: Weller
- Model: T0051807799
- Price: 67.23 GBP
- Previous price: 110.38 GBP
- Discount: 39%
- Price checked: 2026-11-12T17:58:51.350Z
- Rating: 4 / 5
- Reviews: 39

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

- 120 W rating is specified for heavy-duty professional and light industrial work.
- Manufacturer information identifies sheet-metal work as a target for the iron's high power.
- Supplied with a 3-pin plug, according to the listing.
- A thermoplastic handle is described as designed for comfort and a secure grip.

## Pros

- High 120 W rating is suited to work with demanding heat requirements, including the listed example of sheet metal.
- The manufacturer identifies the bent, nickel-plated 12.5 mm tip, type 43110, as supplied with the iron.
- Corded mains operation avoids reliance on a battery.

## Specifications

### Identity
- Brand: Weller
- Model: T0051807799
### Power and temperature
- Power configuration: Corded Electric
- Wattage: 120 watts
- Input voltage: 230 Volts \(AC\)
- Upper temperature rating: 500 Degrees Celsius
- Heating element: Nichrome
### Tip and construction
- Tip: Curved, nickel-plated soldering tip of 12.5 mm, type 43110
- Handle material: thermoplastic
- Style: Pencil
### Dimensions and installation
- Weight listed: 1.96 Pounds

## Before you buy

- The listing gives an upper temperature rating of 500 Degrees Celsius but does not specify temperature adjustment or control. Treat this as a listed rating, not evidence of adjustable temperature.
- The listing gives 230 Volts \(AC\), while the title says 240 Volt. It also describes the tip as 12.5 mm, type 43110 in the product information but the item-type text formats this differently as 12, 5 mm Type 43110. Confirm the intended voltage and tip details for the selected listing before purchase. The listed item length of 1 Centimetres appears inconsistent with the product description, so it is not included as a useful dimension.

## In the box

- 1 soldering iron (Included)

## A good fit for

- Professional or light industrial users needing a high-power corded iron for heavy-duty soldering.
- Buyers whose work includes larger heat-demanding tasks such as the stated sheet-metal application.

## Less suited to

- Buyers who need documented temperature adjustment, a soldering station or a cordless tool.
- Fine electronics work where a narrower tip or lower-power setup is preferred.

## Customer feedback

Aggregate ratings are generally favourable, with many five-star ratings, but a notable share are one-star. With no review-summary evidence, the ratings do not explain what buyers liked or disliked. They cannot establish performance or suitability for a particular task, so assess the listed 120 W power, tip and lack of stated temperature control against your needs.

## Frequently asked questions

### Is the Weller SI120 temperature adjustable?
The supplied listing gives an upper temperature rating of 500 Degrees Celsius but does not state that the temperature can be adjusted.
### What tip is listed as supplied?
The manufacturer description says it comes with a curved, nickel-plated 12.5 mm soldering tip, type 43110. The listing has inconsistent tip formatting, so confirm the tip details with the selected listing.
### What voltage does this soldering iron use?
The technical details specify 230 Volts \(AC\), while the title says 240 Volt. Check the voltage for the version being offered before buying.
### Who is this iron intended for?
The manufacturer describes it for professional and light industrial users, and mentions sheet-metal work as an example of a task with high power requirements.

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## Add-ons

- [AUSTOR 1.5mm Lead Free Solder Wire with Rosin Core, Sn 99% Ag 0.3% Cu 0.7% \| 50g](https://bargainpostbox.co.uk/visit/weller-si120-t0051807799-soldering-iron)

## Images

![Weller SI120 T0051807799 120 W Soldering Iron — 1](https://bargainpostbox.co.uk/i/i4v1hRbooOfuS4XnTWOHXw7KoEcTHPqG71z6FpRgt7nW-R7jR7Q7ttM-cpQWXoXhroNIgsU3SaU91lmTmWwlxjghsf1_hYbmtg0ukmNpSXl1q8ZQhzux.jpg)

![Weller SI120 T0051807799 120 W Soldering Iron — 2](https://bargainpostbox.co.uk/i/YalNaw3-rwYn6cpMSdpycdA5kA606UkeIW-fzbYqLHsWr-To0JJHwPX5tW9zPy4qGs_S1UH5qtF2uPV7tt8rGMX30_qnL_vpg2hU5jh5gcciPavIB5Z2.jpg)

![Weller SI120 T0051807799 120 W Soldering Iron — 3](https://bargainpostbox.co.uk/i/UDQf0lECjkdEP63MvPFas-nSnZISawkSGfZmmW3UozIH49FRQ9er-QZN1xR0toWYVThSIA_iywkEAWlXIGxNV7_d4gUiuQUVWvCtVQtTtOF0OoahOklm.jpg)

![Weller SI120 T0051807799 120 W Soldering Iron — 4](https://bargainpostbox.co.uk/i/sRYIo95t6n1lHfMzCSZIEOCDt7uIDT5Dp_tBP5ChpSP6N7Zz9er9ilTg8STCNivVndsd_HwZYHq1dj0UdHOMSVochHewLU1mpGR77evaMyHWDcYjYlld.jpg)