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Kester 24-6337-8800 50 Activated Rosin Cored Wire Solder Roll, 245 No-Clean, 63/37 Alloy, 0.031" Diameter

4.8 out of 5 stars 958 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice
  • Package Dimensions: 6.223 cms (L) x 6.731 cms (W) x 6.223 cms (H)
  • Product Type: Electronic Component
  • Package Quantity: 1
  • Country Of Origin: United States
› See more product details

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 2.5 x 2.5 x 2.25 inches; 1 Pounds
  • Item model number ‏ : ‎ 24-6337-8800
  • National Stock Number ‏ : ‎ 3439-01-509-4430
  • Date First Available ‏ : ‎ September 27, 2013
  • Manufacturer ‏ : ‎ Kester
  • ASIN ‏ : ‎ B00068IJOU
  • Best Sellers Rank: #18,498 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
  • Customer Reviews:
    4.8 out of 5 stars 958 ratings

Product Description

24-6337-8800
245 No-Clean Flux Solder will create visually acceptable assemblies without the need and expense of cleaning. Solderability and efficiency are comparable to that of mildly activated rosin flux (RMA). Residues are non-corrosive, non-conductive and do not require removal in most applications.

What's in the box

  • 24-6337-8800#2

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    Customer reviews

    4.8 out of 5 stars
    958 global ratings

    Customers say

    Customers find this solder to be the best for electronics projects, with good lead-bearing properties and excellent quality. Moreover, the product flows nicely and melts perfectly, making it easy to use. Additionally, customers appreciate its durability, noting it lasts longer than most marriages, and consider it excellent value for the price.

    Select to learn more

    Solder qualityQualityWorks wellFlowMelt rateEase of useValue for moneyDurability
    64 customers mention "Solder quality"60 positive4 negative

    Customers praise the solder's quality, describing it as amazing and the best choice for electronics projects, with one customer noting it's particularly suitable for home hobbyists.

    "...This is the best solder I've used to date. Just remember to get a syringe of Kester rosin flux to use when making your joints...." Read more

    "This is great solder, one of my favorites. But Kester really blew it on the packaging...." Read more

    "Good solder. Used it yesterday and today so far. Solders all my wires together...." Read more

    "Excellent solder. It's Kester, so it's always the best quality." Read more

    55 customers mention "Quality"54 positive1 negative

    Customers find the solder roll to be of good quality, with one customer noting it provides bare minimum high-quality rosin flux.

    "Good product.. Does not corrode..activates well..and leaves a good finish overall..melts very easily at the right temperature.." Read more

    "This is the good stuff. It's more expensive than most solders, but the results are well worth it...." Read more

    "Great Price, on a Great Product, Just wish Packaging was Better..." Read more

    "Great stuff, I've been using this in all my projects for the past 4 years, flows great, 63/37 never leaves a cold joint, the 0.031" is perfect for..." Read more

    30 customers mention "Works well"30 positive0 negative

    Customers find that the solder roll works well, particularly for cleaning copper surfaces, and one customer mentions it's perfect for circuit repair.

    "...This is just what the Dr. ordered. Works great" Read more

    "Lead - yum. It works well." Read more

    "...Excellent value for the amount that you get Works well I’ve never had an issue A great thickness for minor board repair" Read more

    "...Worked great, no complaints." Read more

    25 customers mention "Flow"22 positive3 negative

    Customers find that the solder flows nicely and is very easy to work with, with one customer noting its quick flow rate.

    "...I've been using this in all my projects for the past 4 years, flows great, 63/37 never leaves a cold joint, the 0.031" is perfect for most through..." Read more

    "Melt fast and flows nicely, I have been wondering why some of my solder flow nicely and some don't, before I place my order for my re-supply, I..." Read more

    "Easy to work with. Flows beautifully!" Read more

    "...But this stuff. Just WOW. It flows easier, melts at a lower temp, IT COOLS SHINY. And price per gram it's actually cheaper than the china stuff...." Read more

    20 customers mention "Melt rate"17 positive3 negative

    Customers find that the solder melts quickly and flows perfectly, with one customer noting it hardens like shiny steel.

    "Melts nice and easily. Flows smoothly...." Read more

    "...This traditional alloy melts at a lower temperature than the newer lead-free solders and so is easier to use, which can make it easier to solder..." Read more

    "...I love the even melt of the lead and tin in this solder and the rosin is just enough to easily wet the joint being welded...." Read more

    "Using this stuff for audio cables and it works really well. Melts predictably and holds strong." Read more

    19 customers mention "Ease of use"14 positive5 negative

    Customers find the solder roll easy to use.

    "This solder is very flexible and easy to use. It melts and cools quickly and makes soldering very easy!" Read more

    "This is the s***, easy flowing, easy to work with, a must have for wiring jobs ,highly recommend, you will not be disappointed. ..." Read more

    "...that’s mainly because it has very little flux—making it difficult to use for small, detailed jobs." Read more

    "...at a lower temperature than the newer lead-free solders and so is easier to use, which can make it easier to solder sensitive components and..." Read more

    18 customers mention "Value for money"16 positive2 negative

    Customers find the solder roll to be a great value, offering excellent quality for the price.

    "Excellent quality solder for the price. Better than 60/40 because it solidifies a lot quicker, making it less likely to form a cold joint...." Read more

    "...And price per gram it's actually cheaper than the china stuff. 100% recommend. Just try it it's cheap enough...." Read more

    "Very good solder for the money" Read more

    "GREAT FLOW AND GREAT DEAL." Read more

    13 customers mention "Durability"10 positive3 negative

    Customers find the solder roll durable, noting it holds well for months and lasts longer than most marriages, with one customer mentioning it doesn't corrode.

    "...with ease and the joints look amazing and are strong. This solder is the real deal and reminds me why I fell in love with the hobby as a kid." Read more

    "...The flow and pooling is great. 1lb of solder will last a very long time. Only thing was the shipping. It took a bit longer than expected." Read more

    "...Better than 60/40 because it solidifies a lot quicker, making it less likely to form a cold joint...." Read more

    "...The chunk cut through the first and second layers of the solder. It's still usable but prolly going cut the top two layers off." Read more

    Works great!
    5 out of 5 stars
    Works great!
    I purchased this soldering wire on the recommendation of many an RC enthusiast. I initially had some difficulty making this solder “stick” to PCB pads (@350C), but after cleaning and recoating my soldering tip, thereby removing my old soldering alloy and replacing it with the new, it was smooth sailing. The solder flows easily and sets quickly once the tip is removed. It also results in a lot less flux residue than what I am use to. Minimal cleanup, if any. Highly recommended. Thank you for shipping to South Africa for me. Could not find Kester at all, locally.
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    Top reviews from the United States

    • M&E
      5.0 out of 5 stars Great material
      Reviewed in the United States on November 25, 2025
      Verified Purchase
      Worth the price point, makes soldering so much faster
      Helpful
       Report
    • Victor lazaro
      5.0 out of 5 stars Reddit approved.
      Reviewed in the United States on October 8, 2025
      Verified Purchase
      Great quality solder! No more cold joints. I asked what the best solder would be on Reddit and this was the top answer.
      Helpful
       Report
    • MakerTool
      5.0 out of 5 stars Bare Minimum High-Quality Rosin Flux
      Reviewed in the United States on June 19, 2025
      Verified Purchase
      Kester 245 is a very clean high-quality solder, with a minimum size core (1.1%) of halide free low activity flux (ROL0, per J-STD-004B). I use it when I'm using supplemental liquid or gel flux, (which I don't want to mix with my standard go-to Kester 44's flux). Kester 245 leaves the least amount of non-acidic residue. It is truly a no clean solder.
      One person found this helpful
      Helpful
       Report
    • J
      5.0 out of 5 stars Excellent, the real thing
      Reviewed in the United States on July 30, 2025
      Verified Purchase
      Excellent solder. It's Kester, so it's always the best quality.
      One person found this helpful
      Helpful
       Report
    • Jorge Luis
      5.0 out of 5 stars La mejor Soldadura
      Reviewed in the United States on July 22, 2025
      Verified Purchase
      Excelente Producto, buen precio recomendado 100%
      One person found this helpful
      Helpful
       Report
    • tnscot
      5.0 out of 5 stars Best solder for electronics projects and repairs
      Reviewed in the United States on May 14, 2025
      Verified Purchase
      Kester solder is the gold standard, and this is the recommended solder for electronics projects and repairs. Be aware that this contains lead, so be sure that your soldering station is well ventilated. You don't want to be breathing the fumes!
      2 people found this helpful
      Helpful
       Report
    • Grantherum
      4.0 out of 5 stars Meh.
      Reviewed in the United States on January 30, 2021
      Verified Purchase
      This solder Kester 24-6337-8800 is supposed to be some of the best out there. I've been trying to use it off and on now for 3 weeks and still can't get it to flow well. I don't know if it's the no-clean flux... or if that flux is only 1%, but seemingly no matter what temp I set it at, it doesn't want to play nice. It is shiny and clean looking when it is finished, but it just takes a lot of effort to get there. I'm sure there is a trick to getting it to work quick and easy, I just haven't found it yet. Perhaps when I do I'll adjust this review and toss another star on so that I can let y'all know how I fixed what I was doing wrong with it. Till then, I'm using KESTER SOLDER 24-6040-0027 which I've found works beautifully and doesn't take much clean up with the flux.
      6 people found this helpful
      Helpful
       Report
    • markus adams
      5.0 out of 5 stars great stuff
      Reviewed in the United States on April 29, 2025
      Verified Purchase
      After using this stuff at work for the last few years, I set up a workbench at home at got this for use there. Works great
      One person found this helpful
      Helpful
       Report

    Product Summary: Kester 24-6337-8800 50 Activated Rosin Cored Wire Solder Roll, 245 No-Clean, 63/37 Alloy, 0.031" Diameter

    From Kester

    4.8 out of 5 stars, 958 ratings

    Customer reviews

    50+ bought in past week

    Price

    No featured offers available

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    About this Item

    • Package Dimensions: 6.223 cms (L) x 6.731 cms (W) x 6.223 cms (H)
    • Product Type: Electronic Component
    • Package Quantity: 1
    • Country Of Origin: United States

    Product Description

    24-6337-8800 245 No-Clean Flux Solder will create visually acceptable assemblies without the need and expense of cleaning. Solderability and efficiency are comparable to that of mildly activated rosin flux (RMA). Residues are non-corrosive, non-conductive and do not require removal in most applications.
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