Is there a chart somewhere that says when/what to use 60/40 for and when to use 63-37 instead?

the lower temp 63-37 is more prone to cracking although rarely is an issue. 60-40 is best if you are not concerned with the temp difference

I just received this solder and nowhere on the packaging does it indicate a rosin core. Directions also say to add flux, Is it in fact Rosin Core?.

If the roll of solder you received from this page does not say: "44" ROSIN CORE - on the right side, in the yellow stripe, then it is not the solder you paid for. I am 66 years old, learned to solder electronic components by having to complete a full 16 hour course during my electronics training in the USAF back when I had just hit 18. ALL the solder provided to work on the aviation and aerospace gear I dealt with while in service was Kester "44" with 60/40 ratio. PERIOD. I still have a few empty spools from back then. The only difference is they were metal spools back then, and the label was a paint-printed like a soda can. BUT the label looked the same (1971-75) then as it does now. It quite definitely says that is it rosin cored. If the label is missing (can happen these days with printed paper labels and plastic spools that don't accept glue well) you can test for rosin core by cutting off some of the tip (to remove the seal your solder iron left there) and if you then heat the solder with an under-temp iron, the rosin should "bubble" out the open end before the lead/tin melts.

does anyone know how many meters does this comes with?

The length is approximately between 380 to 400 feet or 115.8 to 121.9 meters per pound.

Would you use this solder for audio kit circuit boards like the wave "http://www.amazon.com/wave-analog-driven-spring-reverb/dp/b00r8jfblo/ref=sr_1_1"

Kester SN60-/PB40 solder or Kester SN63/PB37 solder, 44 rosin core will both work well for audio and circuit board applications.

Kester Solder 24 6040 0027 Wire Solder 0 031dia Pack

Description

⚡ Solder like a pro—power through every connection with Kester’s precision and durability!

OPTIMAL FLUX RATIO - 3.3% flux content for superior flow and cleaner joints compared to typical 1.8% flux solders.
PRECISION DIAMETER - 0.031" wire thickness for meticulous, professional-grade soldering control.
PROVEN RELIABILITY - Rated 4.9/5 by over 2,600 pros who refuse to compromise on their craft.
TRUSTED GLOBAL QUALITY - Manufactured in Taiwan, a hallmark of consistent, premium mechanical components.
UNRIVALED THERMAL STABILITY - Withstands intense heat without burning off, ensuring flawless multi-section soldering sessions.

Kester Solder 24-6040-0027 is a 1 lb spool of 0.031" diameter SN60PB40 wire with 3.3% flux, engineered in Taiwan for superior thermal endurance and high current handling. Praised by thousands for its reliability and clean flow, it’s the go-to choice for professionals demanding flawless, long-lasting solder joints.

Reviews

J**L

Quality over price here it might cost you more than most other solders but it delivers

What can I say about this product well there's a reason that they're one of the best in the world because they put out great products they're solder is multiple at low or high temperatures withstands high temperatures and high currents and withstands the test of time not like some solders that as soon as you put it to your tip starts to burn off immediately not this stuff you can actually have it set on there and work with it and do multiple little sections of soldering before having to wick it off Great product can't say enough well worth its price

24.07.2025

G**Y

best solder on market?

this is the best solder i have ever used. the flux rate of 3% is better than the 1.8% you'll find here. It might seem expensive at first butt if you do the math on some of the other cheaper solder like austra, you're paying more per pound.

25.03.2026

D**L

The best for high end guitar work

Since I started using this solder, the quality of my finished soldering work has greatly improved. Highly recommended for sure.

12.04.2026

K**G

Great solder for any electronic project

As an electronic enthusiast I am glad this is still being made at such a great value, and the fact that it is made in the USA is also a huge plus. This solder works great and the flux that is in it is also super easy to clean up. Shipping was also super fast.

23.03.2025

N**A

Excellent.

Goods match the description. Fast dispatch and delivery. I recommend this seller.

29.12.2025

S**7

Amazing

This is the best solder iv ever used. I couldn’t find my good iron so used some cheap $9 iron I found on Amazon, the iron was basically a steel rod left in a fire with a handle. The solder still flowed excellent. I honestly probably won’t buy anything else.

1.04.2026

D**T

Level up to this!!!

I WAS reordering leaded .8mm at 100grams per roll. Finally paid attention to the Kester seemingly expensive solder, but doing the math for a 1 pound roll, it works out well! It DOES still shine when cooled, which is a huge contrast to the cloudy look of the "cheap stuff". that happens to make it easier to check the work under magnification. MOST importantly, this solder flows MUCH better than the off name brand. I thought the ugly work was my iron or tip, but turned out to be the weird named solder! I definitely recommend upgrading to Kester if you have been use to the light rolls of Chinese off brands. I got another roll of .5mm wire for SMD work and am much more confident working the micro stuff now

14.05.2024

J**N

Easy to use..

Super easy to use!

3.05.2026

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KESTER SOLDER 24-6040-0027 Wire Solder, 0.031"Dia., Pack of (1),32117

Description

Specifications

Reviews

Common Questions