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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125x100' BLACK 1-BAG SPLINE

Product ID: 342958381

Details

Brand
Saint-Gobain
Colour
Black
Material
Flexible PVC
No. of wires
1
Number of Cable Strands
1

📏0.125 inch thickness for precise fit

📐100 ft length covers large projects

🖤Black color for sleek, professional finish

€ 45.43

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Description

🖤 Lock in perfection with every screen install — don’t let your windows settle for less!

PROFESSIONAL FINISH - Black spline adds a sleek, modern look that elevates any screening job
DURABLE YET FLEXIBLE - Flexible PVC material bends easily around corners while maintaining strong hold
UNIVERSAL COMPATIBILITY - Works flawlessly with ADFORS Pet Polyester, Solar, and Aluminum screens
BULK LENGTH BULK SAVINGS - 100-foot roll lets you tackle multiple projects without constant reordering
PRECISION FIT EVERY TIME - 0.125 inch thickness ensures seamless screen retention in 5/16” x ¾” frames

Saint-Gobain ADFORS .125x100' Black 1-Bag Spline is a durable, flexible PVC spline designed for secure and flawless screen installation. Measuring 0.125 inches thick and 100 feet long, it fits standard 5/16” x ¾” frames and is compatible with various ADFORS screens including pet, solar, and aluminum types. Its black color offers a sleek finish, making it a top choice for professionals and DIYers aiming for a polished, long-lasting result.

Specifications

ASIN	B00GWU82WK
Best Sellers Rank	#462,560 in Home Improvement ( See Top 100 in Home Improvement ) #259 in Window Screens
Country of Origin	USA
Generic Name	Spline
Included Components	Saint-gobain ADFORS Spline, 125 in X 100 ft, Black
Item Dimensions LxWxH	51.4 x 21.6 x 13 Centimeters
Item Weight	249 g
Item model number	FSP8521-U
Manufacturer	Saint-Gobain ADFORS
Net Quantity	1.0 Count
Product Dimensions	51.44 x 21.59 x 12.95 cm; 249 g

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€ 45.43

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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