#1 Home Improvement Retailer

Internet #204195330

Model #SP40NKUS

Store SKU #1000011104

40-Watt LED Soldering Iron Kit

  • Ceramic heater technology heats up to 900 degrees
  • Co-Molded soft grip ribbed handle for comfort
  • Only compatible with Weller tips
  • See More Details

Frequently Bought Together


Product Overview

The Weller SP40NKUS Standard Duty LED Soldering Iron Kit has co-molded soft grip ribbed handle design for maximum comfort and reduced slippage. The wire connection is less than 12-AWG. The high-performance ceramic heater technology will heat up to 900 Degree F.
  • Weller Soldering Iron Kit with LED 40W, 120V, US
  • High performance consumer soldering iron with the latest LED technology
  • 3 LEDs for superior accuracy and application illumination without shadowing
  • Co-molded and ribbed grip for maximum comfort and reduced slipage
  • Triangular handle for tip positioning and precise control
  • Stainless steel heater construction
  • UL listed - cUL version available
  • Excellent quality consumer iron
  • IMPORTANT: Use only original Weller tips
  • Includes: Iron with MT10 tip, Iron stand, Soldering aid, Lead-free solder, ST3 and ST7 tips, User manual
  • Click here for more information on Electronic Recycling Programs

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.

Compare Similar Soldering Irons

60-Watt Red Soldering Iron
current product
Top Rated40-Watt LED Soldering Iron Kit
VersaTip Gas Torch Solders, Heats, Melts, and Cuts a Wide Variety of MaterialsExclusive18-Volt ONE+ 40-Watt Soldering Iron (Tool-Only)
Name60-Watt Red Soldering Iron40-Watt LED Soldering Iron KitVersaTip Gas Torch Solders, Heats, Melts, and Cuts a Wide Variety of Materials18-Volt ONE+ 40-Watt Soldering Iron (Tool-Only)
Power Source110 Volt OtherOther
Wattage (watts)60 040 W
Cordless/ CordedCorded CordlessCordless
View ProductView ProductView ProductView Product



Product Depth (in.)
Product Height (in.)
Product Width (in.)


Soldering Product Type
Soldering Irons
Tools Product Type
Hand Tool

Questions & Answers


Is this good for hobby projects?

Asked by 5456 December 6, 2020

Yes. I use it for my model Railroad project lighting.

Is this good for repairing circuit boards?

Asked by Matt March 5, 2020


The unit comes with a black plastic piece about the size of a pencil with a different tip on each...

Asked by Brooos January 20, 2019

It’s to help form the solder

I bought this at home depot and IT WAS NOT the one in the picture

Asked by Carl December 24, 2018

Mine came sealed in a plastic package complete with 2 extra tips, a tiny roll of solder, the instructions, and the cord

Is it UL listing?

Asked by Joseph December 23, 2018


Is the Weller SP40NKUS OSHA approved?

Asked by preston November 7, 2018

I could not find any info on that.

Hello. What is the diameter or the tip that is inserted into the soldering iron???

Asked by shoe February 13, 2018

The tips have a quarter inch diameter

Does this item have a "cooling" stand? A platform to leave the tip to cool

Asked by TheSly November 21, 2017


Is this good to splice electrical wiring?

Asked by HI October 15, 2017

It works well for soldering two wires, provided you have the solder to go with it.

How many tips comes with this.

Asked by Don July 30, 2017


40-Watt LED Soldering Iron Kit - page 2

Customer Reviews

  • 4.2
    out of 361 reviews
  • 84% recommend this product
Filter by:
Showing 1-10 of 361 reviews
I needed a small solder iron for hobby and electric work. This unit works well. I like the select...
I needed a small solder iron for hobby and electric work. This unit works well. I like the selection of tips from pointed to flat blade. I use this unit not only to solder but to cut holes in plastic. You can even make your own cutting tips and screw them on with a short screw.Having the ability to change tips is very helpful. The LEDs are also a help in illuminating the area. A Super Solder !!!!
by Golfvet
6 people found this helpful
Worked perfectly for my application. Needed to solder XLR ends to microphone cable. Needed to wir...
Worked perfectly for my application. Needed to solder XLR ends to microphone cable. Needed to wire brush the tip to keep it clean of course. It was 32 solder points in all. Knocked out the job very quickly.
by Nausser
1 person found this helpful
Ideal Weller Soldering Iron.....
This Weller Soldering iron is ideal for creating stained glass lamp shades. Heats quickly. Melts solder evenly. I have been using the Weller Solder iron products for almost 50 years [ ! ]. Reliable. Long life.
by HomeDepotCustomer
3 people found this helpful
Great soldering kit!
This is a really nice soldering kit that has all the bells and whistles that you could want. I'm really impressed with this set up and it works exceptionally well. Heats up quickly and is pretty precise! Comes with some solder, the soldering iron, stand and different heads. This is my first soldering iron but have worked with them before. Does a great job and I'm definitely a happy camper with the results. Highly recommend!
by Matrix
2 people found this helpful
Useful Soldering Kit
General: Good quality and useful soldering iron. The LED lighting comes in very handy when working outside of a work bench. I’ve used it to solder wires on a boat where there is low light; which is when you can really appreciate having the LED lights on it. Material/Construction: Looks and feels like a good quality soldering iron. Functionality: Works as it is supposed to. Heats up fast. There is not temperature control, so you would have to be a little more careful when soldering. The smaller tips that come with the kit are useful when soldering smaller components on circuit boards. The iron is fairly light which is nice when working with it for an extended period of time.
by emgc64
9 people found this helpful
Iron it out
I've been nursing an older model from the former electronics 'Shack' and goodness does this do so much better. Heats up fairly quickly and the LED lights are a great addition. Nice to have interchangeable tips too. One thing I wish they could have sorted out was the power cord, specifically the weight or pliability. The iron has a triangle shaped throat so it should sit nicely on the bench but the cord causes it to shift awkwardly even with the included "stand". Probably best to grab a different stand or a hands free option. Overall great upgrade for me.
by DstBstSN
2 people found this helpful
Did not work properly
I bought this expecting it to be a big upgrade from my cheapo Harbor Freight iron I had. First off, the grip and light is kool but as far as heating up, thing sucks. The tips fit very very loosely in the gun so who ever milled this particular iron was drunk or high because its like about .050 out. I do have a receipt but I have used all the accessories that came with it so I don't know if I would get my money back or not. Do your homework before buying this iron, the one I had was definitely garbage.
by Zip
I wish it had an on/off switch close to the...
I wish it had an on/off switch close to the soldering iron so it isn't necessary to unplug it when not in use for short periods of time.
by HomeDepotCustomer
1 person found this helpful
Piece of junk...actually will be returning it!...
Piece of junk...actually will be returning it!
by HomeDepotCustomer
1 person found this helpful
Works really well. Better than soldering gun.
Works really well. Better than soldering gun.
by Philbo
Showing 1-10 of 361 reviews