---
product_id: 41425387
title: "Century Spring C-303 Extension Springs, 12\""
brand: "century spring"
price: "€ 26.47"
currency: EUR
in_stock: true
reviews_count: 4
url: https://www.desertcart.sk/products/41425387-century-spring-c-303-extension-springs-12
store_origin: SK
region: Slovakia
---

# 12-inch precision length Durable spring steel wire 35.4 lb max safe load Century Spring C-303 Extension Springs, 12"

**Brand:** century spring
**Price:** € 26.47
**Availability:** ✅ In Stock

## Summary

> ⚙️ Elevate your build with tension that never quits!

## Quick Answers

- **What is this?** Century Spring C-303 Extension Springs, 12" by century spring
- **How much does it cost?** € 26.47 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/41425387-century-spring-c-303-extension-springs-12)

## Best For

- century spring enthusiasts

## Why This Product

- Trusted century spring brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Lightweight Yet Strong:** Only 23 grams, perfect for efficient, hassle-free installation.
- • **Robust 35.4 lb Load Capacity:** Handles heavy-duty tension without compromising safety.
- • **Trusted Century Spring Brand:** Quality you can count on for professional-grade applications.
- • **Premium Spring Steel Construction:** Ensures long-lasting durability and reliable performance.
- • **Precision Engineered 12-Inch Length:** Fits seamlessly into your projects with exact sizing.

## Overview

The Century Spring C-303 Extension Spring is a 12-inch, silver spring steel wire component designed to withstand a maximum safe load of 35.4 pounds. Lightweight at just 23 grams, it offers precise dimensions and reliable durability, making it an essential part for professional and DIY projects requiring consistent tension and strength.

## Description

Century Spring C-303 Extension Springs, 12"

## Features

- Maximum deflection
- 35.4 lb maximum safe load
- Feature: 12 inch length

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Color | Silver |
| Material | Spring Steel Wire |
| Brand | Century Spring |
| Item dimensions L x W x H | 1 x 1 x 12 inches |
| Item Weight | 23 Grams |
| Included Components | Century Spring - C-303 |
| Number of Pieces | 1 |
| UPC | 038594003039 |
| Global Trade Identification Number | 00038594003039 |
| Manufacturer | Century Spring |
| Part Number | Century Spring - C-303 |
| Item Weight | 0.811 ounces |
| Product Dimensions | 1 x 1 x 12 inches |
| Country of Origin | China |
| Item model number | Century Spring - C-303 |
| Item Package Quantity | 1 |
| Measurement System | inch |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Color:** Silver
- **Material:** Spring Steel Wire
- **Brand:** Century Spring
- **Item dimensions L x W x H:** 1 x 1 x 12 inches
- **Item Weight:** 23 Grams

## Images

![Century Spring C-303 Extension Springs, 12" - Image 1](https://m.media-amazon.com/images/I/21nwNCnh1GL.jpg)
![Century Spring C-303 Extension Springs, 12" - Image 2](https://m.media-amazon.com/images/I/41YxgrT8ULL.jpg)
![Century Spring C-303 Extension Springs, 12" - Image 3](https://m.media-amazon.com/images/I/41F6DPdQGnL.jpg)
![Century Spring C-303 Extension Springs, 12" - Image 4](https://m.media-amazon.com/images/I/219hXHMd6BL.jpg)

## Questions & Answers

**Q: HI on the 1.0 x 12'' extension spring there are 2 lengths one is 12in closed I need the max expanded length? I need to it to expand 32inches**
A: It looks like this only extends to about 24".  Starts at 12" collapsed length and has a suggested max deflection of about 12".  Also suggested max load rating, if you need it, is about 35 pounds.

**Q: Can this be used on a french door to hang a curtain panel; needs to extend o 24 inches?**
A: I think so.  It's recommended maximum extension is 24" so your right at the end what it's rated for.

**Q: Is this spring galvanized?**
A: Close, it's not galvanized but zinc plated instead.

**Q: what is the OD?**
A: It is 1" outside diameter.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Made in USA
*by S***H on April 29, 2024*

Just perfect for my use, which is tensioning the corner of a triangle-shaped sail shade.Those sail shades are frustrating to tighten at the corners. And one spring itself is almost the cost of a shade.Thanks to Century for continuing production in the USA.

### ⭐⭐⭐⭐⭐ worked great
*by K***R on September 2, 2021*

nice product worked great

### ⭐⭐⭐⭐⭐ Diameter and tension just what I needed.
*by A***. on August 29, 2018*

Good quality spring used it in a 3d router set up .

## Frequently Bought Together

- Century Spring C-303 Extension Springs, 12"
- SATC Flap Discs 115mm 20 Pack Grinding Discs 40/60/80/120 Grit for Angle Grinder to Sanding Grinding Metal Wood

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**Shop now:** [https://www.desertcart.sk/products/41425387-century-spring-c-303-extension-springs-12](https://www.desertcart.sk/products/41425387-century-spring-c-303-extension-springs-12)

---

*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-02-01*