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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Saint-Gobain ADFORS

Product ID: 279505822

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Details

Colour
Black
Brand
Saint-Gobain
Material
Flexible PVC
Number of cable strands
1
No. of wires
1

📏0.125 in width

📦100 ft length

🖤Black color

Description

🖤 Keep Bugs Out in Style!

📏 PERFECT FIT - Ideal for 5/16” x ¾” frame sizes, ensuring a snug and secure fit.
💪 DURABLE MATERIAL - Crafted from flexible PVC for long-lasting performance and reliability.
🔒 SECURE YOUR SCREENS - Easily secures screens into frame channels for a flawless finish.
⚙️ USER FRIENDLY DESIGN - Designed for effortless installation, making DIY projects a breeze.
🛠️ UNIVERSAL COMPATIBILITY - Works seamlessly with all types of insect screening, including ADFORS Pet Polyester and Solar Screens.

The Saint-Gobain ADFORS FSP8521-U Spline is a 0.125 inch wide, 100-foot long black spline made from flexible PVC, designed to secure screens into frame channels effortlessly. Compatible with various insect screening types, it ensures a perfect fit for 5/16” x ¾” frames, making it an essential tool for any DIY enthusiast.

Specifications

Manufacturer	Saint-Gobain ADFORS
Part number	FCS8521-U
Item Weight	249 g
Product Dimensions	51.44 x 21.59 x 12.95 cm; 249 g
Item model number	FSP8521-U
Size	.125 in X 100 ft
Color	Black
Style	.125" x 100'
Material	Flexible PVC
Pattern	Spline
Item Package Quantity	1
Included components	Saint-gobain ADFORS Spline, 125 in X 100 ft, Black
Batteries Included?	No
Batteries Required?	No

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