---
product_id: 279505822
title: "FSP8521-U 100' Spline, .125 in X 100 ft, Black, Foot"
brand: "saint-gobain adfors"
price: "¥1943"
currency: JPY
in_stock: true
reviews_count: 5
url: https://www.desertcart.jp/products/279505822-fsp8521-u-100-spline-125-in-x-100-ft-black
store_origin: JP
region: Japan
---

# 100 ft continuous length sleek black color for seamless look FSP8521-U 100' Spline, .125 in X 100 ft, Black, Foot

**Brand:** saint-gobain adfors
**Price:** ¥1943
**Availability:** ✅ In Stock

## Summary

> 🖤 Lock in your view with flawless finesse!

## Quick Answers

- **What is this?** FSP8521-U 100' Spline, .125 in X 100 ft, Black, Foot by saint-gobain adfors
- **How much does it cost?** ¥1943 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/279505822-fsp8521-u-100-spline-125-in-x-100-ft-black)

## Best For

- saint-gobain adfors enthusiasts

## Why This Product

- Trusted saint-gobain adfors brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **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

## Overview

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.

## Description

Spline is the “glue” that holds a good screening project together. Pairing the correct spline size and color will ensure your screens go in smoothly and look great.
Get Everything You Need:

## Features

- 0.125 inch x 100 foot
- Secures screen into frame channel
- Easy to use
- Can be used with all types of insect screening
- This spline is suitable for l for screens such as ADFORS Pet Polyester Screen, ADFORS Solar Screen, and ADFORS Aluminum Screen when working with when working with a 5/16” x ¾” Frame

## Technical Specifications

| Specification | Value |
|---------------|-------|
| 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 |

## Product Details

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

## Images

![FSP8521-U 100' Spline, .125 in X 100 ft, Black, Foot - Image 1](https://m.media-amazon.com/images/I/81idxKikMuL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Questions & Answers

**Q: My  screen has a spline groove that's about 1/4 inch. What size spline do I need?**
A: 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.

**Q: do i need to downsize the spline to install a longer lasting aluminum screen?**
A: 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.

**Q: What size spline do I need for a 5mm slot?**
A: .125"=.32cm.  and that will work on US screen
s.

**Q: What are the dimensions of the spline?**
A: 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ No problems installing
*by  on Reviewed in Canada 7 July 2024*

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

### ⭐⭐⭐⭐⭐ Excellent spline , durable, thinner than average splines and cost way better than other providers
*by  on Reviewed in Canada 10 October 2025*

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!

### ⭐⭐⭐⭐⭐ Thicker than expected
*by  on Reviewed in the United States 27 February 2026*

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.

## Frequently Bought Together

- Saint-Gobain ADFORS FSP8521-U 100' Spline, .125 in X 100 ft, Black, Foot
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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-09-23*