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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Description

⚡ Solder Smarter, Not Harder — Join the Pro League!

IDEAL WIRE GAUGE - .020 inch diameter delivers perfect flow and control for detailed soldering tasks.
COMPACT PORTABLE - Small 6.35 x 6.35 x 5.72 cm size fits effortlessly into any toolkit or workstation.
GENEROUS SPOOL SIZE - 1 lb spool means fewer interruptions—keep your workflow smooth and efficient.
TRUSTED BRAND LEGACY - Manufactured by Kester, a leader in solder technology trusted by pros worldwide.
PRECISION ALLOY BLEND - Optimized 63/37 tin-lead ratio ensures reliable, strong electrical connections every time.

The Kester 24-6337-0010 is a premium 63/37 rosin core solder wire with a .020 inch diameter, designed for precision electronics work. Packaged in a convenient 1 lb spool, it offers consistent flow and strong joints, making it a top choice for professionals seeking reliability and efficiency in their soldering projects.

Specifications

ASIN	B00068IJWC
Best Sellers Rank	#180,260 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #380 in Solder, Solder Fluxes & Pastes
Item model number	24-6337-0010
Manufacturer	Kester
Product Dimensions	6.35 x 6.35 x 5.72 cm; 453.59 g

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