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!

EFFORTLESS INSTALLATION - Flexible PVC material makes spline easy to press into any 5/16” x ¾” frame
UNIVERSAL COMPATIBILITY - Works flawlessly with all ADFORS screens including Pet Polyester, Solar, and Aluminum
EXTENDED REACH ONE ROLL - 100 feet length covers all your screening needs without constant reordering
PROFESSIONAL LOOK EVERY TIME - Black color blends seamlessly for a clean, polished window screen appearance
PRECISION FIT FLAWLESS FINISH - 0.125 inch thickness ensures a perfect, secure hold every time

Saint-Gobain ADFORS .125x100' Black 1-Bag Spline is a flexible PVC screen retaining spline designed for secure, professional-grade installation of insect screens. Measuring 0.125 inches thick and 100 feet long, it fits standard 5/16” x ¾” frames and is compatible with all ADFORS screen types, ensuring a sleek, durable finish for any window screening project.

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Colour	Black
Brand	ADFORS
Material	Flexible PVC
Number of Cable Strands	1
No. of wires	1
Manufacturer	Saint-Gobain ADFORS
Global Trade Identification Number	00011646701756
UPC	011646701756
Model number	FSP8521-U
Number of Memory Sticks	1
Item Weight	249 g
Product Dimensions	51.44 x 21.59 x 12.95 cm; 249 g
Item model number	FSP8521-U
Item Height	5.1 Inches
Item Width	8.5 Inches
Included Components	Saint-gobain ADFORS Spline, 125 in X 100 ft, Black
Are batteries included?	No

Saint-Gobain ADFORS .125x100' BLACK 1-BAG SPLINE

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