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Kester 24-6337-0010 44 Rosin Core Solder 63/37 .020 1 lb. Spool

4.8 4.8 out of 5 stars 648 ratings

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Rosin Core Solder

Purchase options and add-ons

  • Industry standard for decades
  • Excellent solderability to a wide variety of metallization's
  • High activity rosin core formulation
  • Leaves bright/shiny solder joints after reflow
  • Standard core 66 (3.3 percent flux)

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 2.5 x 2.5 x 2.25 inches; 15.87 ounces
  • Item model number ‏ : ‎ 24-6337-0010
  • Date First Available ‏ : ‎ November 19, 2009
  • Manufacturer ‏ : ‎ Kester
  • ASIN ‏ : ‎ B00068IJWC
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.8 4.8 out of 5 stars 648 ratings

Product Description

Kester 44 rosin flux is an activated rosin formula for use in flux-cored solder wire. Kester 44 rosin flux has virtually dominated the field of activated rosin core solders for well over four decades. An outstanding performance feature of this flux is the "instant-action" wetting behavior. The high mobility and fast-spreading action of this flux results in more reliable production line soldering.

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Customer reviews

4.8 out of 5 stars
4.8 out of 5
648 global ratings

Customers say

Customers like the quality, performance, value, ease of use, flow, and size of the solder. They mention that it's a high quality product, works well for electronics, and is well worth the price. Customers also appreciate melting, shine, and the size.

AI-generated from the text of customer reviews

71 customers mention69 positive2 negative

Customers are satisfied with the quality of the solder. They mention that it is a reliable product that makes excellent solder joints. Some say that the quality is high, and it is the best solder for SMD devices. They also say that it wicks better and does not ball up.

"...though it's slightly more expensive than other options, the quality and longevity it offers make it a worthwhile investment...." Read more

"What can I say, this is the Best of the Best. This 1 lb roll will last me forever. Went with very small diameter for surface mount components...." Read more

"This is the best solder I've ever used." Read more

"...Kester solder (with the right ratio) makes excellent solder joints." Read more

36 customers mention36 positive0 negative

Customers are satisfied with the performance of the solder. They mention that it works well for electronics, and it consistently delivers impeccable results. Some say that the solders are very fine and eutectic, making them perfect for fine SMD work. Overall, customers are happy with their purchase and recommend it to others.

"You won't be disappointed with this solder wire! It consistently delivers impeccable results with its shiny solder joints and minimal residue,..." Read more

"It works very well. I had no issues using this solder. It came perfectly coiled and packaged...." Read more

"...It works great with my Hakko FX888D-23BY Digital Soldering Station where I can dial in just the right temperature for each..." Read more

"...I do a ton of SMD and IC work, and this solder works extremely well...." Read more

19 customers mention19 positive0 negative

Customers appreciate the value of the solder wire. They say it's well worth the price, a great buy, and good stuff.

"...other options, the quality and longevity it offers make it a worthwhile investment. Don't miss out on this exceptional product." Read more

"...It's worth the slightly higher cost if you are working with delicate electronics...." Read more

"...Great Stuff.The Seller is excellent too. Thy provided a great price and fast shipping with no problems at all...." Read more

"...A big supply that will last a long time and is certainly worth the cost!" Read more

17 customers mention17 positive0 negative

Customers find the ease of use of the solder very noticeable. They say the narrow gauge makes it much easier to control, and the work will go faster and easier. They also say it Flows smoothly and there's no trouble with it. Customers also mention that the wire melts right into the perf board holes without any soldering frustrations. Overall, customers are happy with the product and the service provided.

"...on it and tried it side by side with the Kester and the ease of use is very noticeable...." Read more

"...very easy to use.I want to be when you send a little closer!" Read more

"...This is seriously life changing. No more soldering frustrations for me, the wire melts right into the perf board holes without any trouble...." Read more

"...Lead solder is the best solder for all types of work it wets faster flows better and makes a better joint...." Read more

14 customers mention14 positive0 negative

Customers are satisfied with the flow of the solder. They mention that it flows great, great for re-flow, and drag soldering, with good flux. The solder leaves clean joints, and has minimal splatter.

"...This stuff melts more easily, flows where it should, and doesn't make those nasty blobs with tails...." Read more

"...The Kester solder was much easier to work with, flows easier and left bright shiny connections even after reflow...." Read more

"...It flows readily, an leaves a shiny, well shaped, joint." Read more

"...This is high quality solder that flows smoothly, leaves clean joints, and has minimal splatter...." Read more

13 customers mention13 positive0 negative

Customers like the melting point of the solder. They mention that it melts and flows better, doesn't ball up, and is perfect for tinkering with circuit boards. It also works well with SMD components and sticks to pads easily. The solder heats quickly and flows well, requiring less heat time.

"...This stuff melts more easily, flows where it should, and doesn't make those nasty blobs with tails...." Read more

"...I've used it on circuit boards and on joining wires and it melts and flows perfectly...." Read more

"...This is now the only solder I will use. Super easy to work with, quick melt and always a good joint. I highly recommend." Read more

"Melts nicely and doesn’t burn. Fills crevices easily and is easily removed using solder wick. Doesn’t drench my protoboard in flux...." Read more

13 customers mention13 positive0 negative

Customers are satisfied with the shine of the solder. They mention that the joints always look shiny and perfect, and the product flows better. They also say that it leaves bright shiny connections even after reflow.

"...It consistently delivers impeccable results with its shiny solder joints and minimal residue, making it the top choice for any soldering..." Read more

"...It's flawlessly shiny, and the smell reminded me of how soldier should smell, just like dad's old rosin core Kester...." Read more

"...solder was much easier to work with, flows easier and left bright shiny connections even after reflow...." Read more

"...It flows readily, an leaves a shiny, well shaped, joint." Read more

10 customers mention10 positive0 negative

Customers find the size of the flux to be excellent, perfect for their work, and good for fine through-hole work. They also say the tiny diameter works nicely and is ideal for small electronics parts soldering. The relatively narrow gauge makes it much easier to control, and the diameter and solder mix work excellently.

"...The diameter and solder mix work excellently and there is definitely a reason that Kester solder is so highly sought after...." Read more

"...helps wetting far faster, requires less heat time, and keeps the connection small and precise...." Read more

"...The relatively narrow gauge makes it much easier to control...." Read more

"Good size for fine through-hole work. Flux gives perfect wetting and doesn't smell terrible." Read more

Kester  That's all you need to know for soldering
5 Stars
Kester That's all you need to know for soldering
The best by far have ever used when soldering with this you know you've got the right stuff it's that good.
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Reviewed in the United States on September 16, 2023
Style: Rosin Core SolderVerified Purchase
One person found this helpful
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Reviewed in the United States on December 21, 2023
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Reviewed in the United States on December 30, 2022
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Reviewed in the United States on September 26, 2023
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Reviewed in the United States on May 3, 2019
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Reviewed in the United States on August 22, 2022
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Reviewed in the United States on March 4, 2019
Style: Rosin Core SolderVerified Purchase
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4.0 out of 5 stars solder is gorgeous! but this time sent not the one I ordered.
Reviewed in the United States on March 4, 2019
The quality of the soldering data is high, the wettability with flux and high solder. very easy to use.

I want to be when you send a little closer!
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Reviewed in the United States on September 21, 2021
Style: Rosin Core SolderVerified Purchase
6 people found this helpful
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