Weller SP40NKUS Soldering Iron Review

Weller SP40NKUS




  • Lightweight
  • Triangular shape
  • Two sizes 25W and 40W
  • Great for beginners


  • Low power
  • Tips could be better
  • Cord is not too long
  • Power - 86%
  • Quality - 93%
  • Quick Heating - 93%
  • Customer Reviews - 91%
  • Works Properly - 97%

About Weller SP40NKUS

Weller sp40nkus

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Soldering iron SP40NKUS is one of the best selling soldering iron on the market. Good and affordable price for soldering iron will simply force you to buy. It is good Weller quality soldering iron with great durability. Package of 40W contains Iron with MT10, 6mm tip, iron stand, user manual, soldering aid tool, lead-free solder, spare ST3 (3.2mm) and ST7 (0.8mm) tips.

Package of 25W contains Iron with MT10, 6mm tip, iron stand, user manual, soldering aid tool, lead-free solder, spare ST3 (3.2mm) and ST7 (0.8mm) tips. It means that iron is available in two different power 25W and 40W so you can select which one is for you. Soldering iron is a particular product for some basic soldering. They are often used in harder soldering or some thick wire, and they are in the transition between soldering stations with digital temperature controlling and soldering gun. Sp40NKUS is soldering iron that is used by everyone including hobbyists, DIY-ers, and professionals.

Weller SP40NKUS Specifications

SP40NKUS is high-performance soldering LED iron. Version with 40W power goes up to 900ºF and 25W version maximum temperature is 750ºF. Three 5mm high-temperature long-life LEDs at 25 Lumens/ft² for superior soldering accuracy. Co-molded soft grip ribbed handle design for maximum comfort and reduced slippage. It has a triangular design which allows quickly controlling during soldering. The balance of weight is impressive, and you can solder without effort. It features a stainless steel heater construction, easy tip changes, and a durable cord with a 5-foot reach. This soldering iron is backed by a 7-year limited warranty.

Customer reviews

Weller SP40NKUS has an attractive rating on Amazon, and it has over 435 customer reviews, and it approves that this is one of best seller soldering iron. Reviews are positive, and usually, they give 5 rating. They are saying iron heating is quick, it can repair a lot of stuff, good for housekeeping and garage. I select a few reviews for you

  • I am a beginner and this tool can do whatever I want. I am satisfied so far.
  • Weller SP40NKUS is soldering iron that can maintain various types of job.
  • Great soldering iron for professionals and for beginners. I like this handle it is amazing.
  • You should try this iron if you have any confusions.

Weller sp40nkus


Weller SP40NKUS soldering iron is a good choice for DIY-ers and hobbyists. If you are new in soldering, maybe you want to buy some cheaper soldering iron, and if you think you will not use it too much. You can buy some no-brand soldering iron for 6-8 $ but often they cannot be used after a few months. With SP40NKUS, you get seven years warranty, and you do not need to worry about quality. It can do a lot of soldering jobs, and it is low price so do not wait to take one now.

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