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 FSP8521-U 100' Spline, .125 in X 100 ft, Black, Foot

Saint-Gobain ADFORS FSP8521-U 100' Spline, .125 in X 100 ft, Black, Foot

Product ID: 279505822

Details

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

📏100 ft continuous length

🖤sleek black color for seamless look

45.45 DT

Duties & taxes included

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Description

🖤 Lock in your view with flawless finesse!

SLEEK BLACK FINISH - Adds a clean, professional look that blends seamlessly with any window frame
LONG LASTING SUPPLY - 100 feet of durable spline means fewer trips to the store and uninterrupted projects
EFFORTLESS INSTALLATION - Designed for easy use, making your DIY or professional screen repairs smooth and fast
UNIVERSAL COMPATIBILITY - Works flawlessly with all ADFORS screens including Pet Polyester, Solar, and Aluminum
PRECISION FIT EVERY TIME - 0.125 inch diameter ensures a perfect, secure hold in 5/16” x ¾” frame channels

Saint-Gobain ADFORS FSP8521-U is a 0.125 inch diameter, 100-foot long black spline designed to securely fasten insect screens into 5/16” x ¾” frame channels. Compatible with a variety of ADFORS screens, it offers easy installation and a sleek finish, making it a top choice for both DIY enthusiasts and professionals aiming for durable, polished window screening solutions.

Specifications

Asin	B00GWU82WK
Best Sellers Rank	#3 in Window Screen Splines
Country Of Origin	China
Date First Available	24 September 2014
Is Discontinued By Manufacturer	No
Item Model Number	FSP8521-U
Manufacturer	Saint-Gobain ADFORS
Product Dimensions	51.44 x 21.59 x 12.95 cm; 249 g

Reviews

User

No problems installing

Got this spline to install a "pet defense" screen on a patio door. The plastic screen is thicker but this spline worked perfectly.

7.07.2024

User

Excellent spline , durable, thinner than average splines and cost way better than other providers

Handyman and myself happy with purchase as hardware store, big box stores don’t carry this size of spline .125inch x 100 ft for old type window screens ! Especially for installing pet screens which are thicker than most screens! Kudos to Amazon.ca for having this product in stock! I had this type of spline many years ago!

10.10.2025

User

Thicker than expected

I'm giving this a 5 star review because it's good for what it is. But I did want to advise others to pay attention to how thick of spline they need. I had previously bought a window screen and spline repair kit that was super easy to use. I just had two more windows to go, so I was ordering spline separately. This was thicker than the other spline I got, and it took so much of my hand strength to get it pushed down. It was really hard, but I didn't feel like going through the hassle of returning it and finding a thinner spline. I made it work, but we'll see if it stays put for long. I have average window screens, and as I mentioned, the spline that I bought from a different Amazon seller was great. So, there was nothing wrong with this spline, but just pay attention to the thickness that you need to order.

27.02.2026

User

It works like all others

Its spline. It holds my camper screen in the door. Just got a butter knife and pushed it into place. Its been a yr now, and its still holding

7.07.2025

User

Buen producto

Cumple con lo señalado

6.08.2024

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45.45 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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