My screen has a spline groove that's about 1/4 inch. What size spline do I need?

1/4th inch would be .250 inches. I suggest that you pull a small piece out and take it with you to your local hardware store to compare. About 1/4 inch is not a close enough measurement. I had several screens (I think 6 screens) that were "about" 1/8 inch. I found that there were three different sizes in the mix even though they "looked" to be "about" the same.

do i need to downsize the spline to install a longer lasting aluminum screen?

Amazon sent me your q since I recently bought this product. Check your screen to see if it currently has spline. If so you need to go ahead and get replacement. You might could use the the old but chances are it will rip enemies extracting, not last much longer, look lousy vs the new screen or all of the above.

What size spline do I need for a 5mm slot?

.125"=.32cm. and that will work on US screen s.

What are the dimensions of the spline?

The latest version of this spline I received is .097" thick and .298" wide. This is flexible spline and works well in my 18 year old screen room which takes more narrow spline than what is currently being sold at Lowe's and Home Depot.

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🖤 Lock in your view with the ultimate screen spline upgrade!

SLEEK BLACK FINISH - Professional black color blends invisibly with your window frames for a clean, polished look.
EFFORTLESS INSTALLATION - Easy to stretch and roll into frame channels, saving you time and frustration.
UNIVERSAL COMPATIBILITY - Works seamlessly with ADFORS fiberglass, insect, and extra strength screens for versatile use.
BULK LENGTH FOR BIG JOBS - 100 feet of durable spline means you’re ready for any window or door repair spree.
PRECISION FIT EVERY TIME - Designed at .140 inches thickness to securely lock your screens without hassle.

Saint-Gobain ADFORS Black Spline is a .140 inch thick, 100-foot long durable screen retaining spline designed for easy installation and secure fit in 5/16” x ¾” window and door frame channels. Compatible with multiple ADFORS screen types, it ensures professional-grade screen repairs and replacements with a sleek black finish.

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Manufacturer	Saint-Gobain ADFORS
Part Number	FCS8522-U
Item Weight	9.6 ounces
Product Dimensions	1 x 7 x 10 inches
Item model number	FSP8522
Is Discontinued By Manufacturer	No
Size	.140 in X 100 ft
Color	Black
Style	.140" x 100'
Pattern	Spline
Item Package Quantity	1
Included Components	Saint-Gobain ADFORS Spline, 140 in X 100 ft, Black
Batteries Included?	No
Batteries Required?	No

Saint-Gobain ADFORS Black Spline, .140 inches x 100 feet - Durable Window and Door Screen Spline, Ideal for Screen Repair and Replacement

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