Would this work well to solder switches to a PCB on a mechanical keyboard?

Yes, this is excellent solder for electrical applications. However, keep in mind this is a large roll that is a lot more then you would need if you are only doing one keyboard. I work on home electronics all the time and still l have a roll I bought at least 3 years ago that I use almost weekly. If you only need a small amount I would recommend you go to sparkfun.com they sell small quantities of solder for small jobs, it may not be Kester brand but it is good solder for your job.

Is this a multicore solder?

All Kester Solder products are single core.

The diameter of this solder is less than 1/32?

1/32" is 0.031", so yes, even if it actually measures out to .022" it is smaller than 1/32" This product is available in 0.031" if you prefer a thicker solder.

Does the Kester 44 solder have a shelf life or expire in x number of years?

The jist: it lasts forever in a dry, non corrosive environment. The expiration date on the box is for the manufacturers warranty. Here is the document from Kester's website explaining: http://www.kester.com/Portals/0/Documents/Knowledge%20Base/Kester%20Shelf%20Life%20Policies.pdf?ver=2016-09-13-140726-910

24 6337 0010 44 Rosin Core Solder 63 37 020

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

⚡ Solder smarter, shine brighter — the pro’s choice for flawless connections!

OPTIMIZED FLUX CORE - High-activity rosin flux ensures clean, reliable connections with minimal residue.
TRUSTED FOR DECADES - Join the millions who rely on Kester’s proven rosin core formula since 1970s.
UNMATCHED WETTING SPEED - Experience lightning-fast solder flow that keeps your projects moving.
PERFECT FOR PRECISION WORK - Fine .020 inch diameter wire ideal for detailed electronics and delicate assemblies.
BRILLIANT FINISH EVERY TIME - Achieve professional-grade, shiny solder joints that impress at first glance.

Kester 24-6337-0010 is a 1 lb spool of 63/37 tin-lead rosin core solder wire with a .020 inch diameter, featuring a high-activity rosin flux formula that delivers instant wetting and bright, shiny joints. Trusted by professionals for over four decades, it ensures reliable, clean soldering across a wide range of metallizations, making it the go-to standard in electronics assembly.

Reviews

S**M

Best electric solder out there

This stuff is awesome. Top tier when it comes to solder

15.12.2025

G**.

Fantastic Solder

I started getting back into soldering, hadn't done it since high school and I really missed it. I did some research online and found this. I am very happy with this solder, I got a holder for it too and it's the center of my workbench. Don't forget to turn your soldering iron up! I have a Pinecil, I find that +/- 640 degrees Fahrenheit works like a charm. The solder melts quickly and forms shiny, neat pads where I need them. A little bit of rosin flux goes a long way too! The price is worth it for this mighty spool.

26.01.2025

R**.

Works perfectly

Perfect for my controllers and keyboards that I repair and build!

19.03.2026

L**M

Best. Solder. Ever.

I cannot state that enough - it really is the best. Throw the lead-free in the trash and get this. You will not be disappointed. It melts like butter, amazing flow and leaves a nice perfect shine. It’s also easy to clean up with alcohol after soldering. You get so much for the $$ in both quality and quantity. It is a LOT of solder!

10.06.2024

M**L

Alpha Solder

Wow, a one-pound roll of this stuff is worth every dime it cost! Not just because it solders so well, but also because it's made in a western country where it's less apt to have toxic chems in some mystery flux brew. It has an IEC rating of ROM1, which is a moderately active rosin flux with halides. A whole pound is a lot for a hobbyist, but it's stored in a wide mouth mason jar with a bag of desiccant, so it'll do non-iso work for decades.

21.11.2024

C**Y

GREAT

Great for general purpose soldering and circuit boards

26.02.2026

E**S

Great product!

Great product, worked very good for my detailed projects. This will likely last me near a lifetime!

14.03.2025

D**S

Worth the extra money

I had always used the cheapest solder I could find until I had some instruction from an electronics teacher with some good quality Kester solder. The difference is huge. I had some cheap solder with Chinese writing on it and tried it side by side with the Kester and the ease of use is very noticeable. This stuff melts more easily, flows where it should, and doesn't make those nasty blobs with tails. I had been thinking I was doing something wrong getting ugly solder joints. Turns out crap solder makes crap joints. Kester solder (with the right ratio) makes excellent solder joints.

3.05.2019

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

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