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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Description

⚡ Lock in your perfect screen with pro-grade precision!

EFFORTLESS INSTALLATION - Easy-to-use spline that rolls smoothly, saving you time and frustration on every job.
UNIVERSAL COMPATIBILITY - Works effortlessly with ADFORS Standard, Clear Advantage, Small Insect, and Extra Strength screens.
LONG LASTING 100 FOOT ROLL - Generous length ensures you have enough spline for multiple projects without constant reordering.
PROFESSIONAL GRADE DURABILITY - Crafted by Saint-Gobain ADFORS, trusted for quality and reliability in home improvement.
PRECISION FIT FOR PERFECT SCREENS - Designed to secure screens seamlessly into 5/16” x ¾” frame channels for a flawless finish.

The Saint-Gobain ADFORS FSP8522 spline is a 0.140 inch thick, 100-foot long black spline designed to securely fasten various ADFORS screens into standard 5/16” x ¾” frame channels. Engineered for easy installation and professional durability, it ensures your window screens stay tight and look flawless.

Specifications

Manufacturer	Saint-Gobain ADFORS
Part number	FCS8522-U
Item Weight	272 g
Product Dimensions	2.54 x 17.78 x 25.4 cm; 272.16 g
Item model number	FSP8522
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

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