--- product_id: 41425387 title: "C-303 Extension Springs, 12\"" brand: "century spring" price: "€ 28.48" currency: EUR in_stock: true reviews_count: 4 category: "Century Spring" url: https://www.desertcart.it/products/41425387-c-303-extension-springs-12 store_origin: IT region: Italy --- # 12-inch precision length 35.4 lb max safe load Made in USA quality C-303 Extension Springs, 12" **Brand:** century spring **Price:** € 28.48 **Availability:** ✅ In Stock ## Summary > ⚙️ Tension perfected — spring into action with Century’s C-303! ## Quick Answers - **What is this?** C-303 Extension Springs, 12" by century spring - **How much does it cost?** € 28.48 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/41425387-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 - • **Proudly Made in the USA:** Support domestic manufacturing with trusted quality and reliability. - • **Precision 12-Inch Length:** Ideal for exact tensioning needs, especially in complex setups like sail shades. - • **Premium Spring Steel Wire:** Engineered for long-lasting resilience and consistent performance. - • **Versatile Industrial Grade:** Perfect for mechanical, industrial, and DIY projects demanding precision and strength. - • **Robust 35.4 lb Load Capacity:** Handles heavy-duty tension without compromising durability or safety. ## Overview The Century Spring C-303 Extension Spring is a 12-inch, industrial-grade spring made from durable spring steel wire. It supports a maximum safe load of 35.4 pounds, ensuring reliable tensioning for applications like sail shades and mechanical assemblies. Manufactured in the USA, it combines precision engineering with domestic quality standards, making it a trusted choice for professionals and DIY enthusiasts alike. ## Description Century Spring C-303 Extension Springs, 12" Review: Made in USA - 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. Review: worked great - nice product worked great ## Features - Maximum deflection - 35.4 lb maximum safe load - Feature: 12 inch length ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000BDB6X6 | | Best Sellers Rank | #164,659 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #103 in Mechanical Extension Springs | | Brand | Century Spring | | Brand Name | Century Spring | | Color | Silver | | Customer Reviews | 4.3 out of 5 stars 64 Reviews | | Global Trade Identification Number | 00038594003039 | | Included Components | Century Spring - C-303 | | Item Dimensions | 1 x 1 x 12 inches | | Item Type Name | Century Spring - C-303 | | Item Weight | 23 g | | Item dimensions L x W x H | 1 x 1 x 12 inches | | Manufacturer | Century Spring | | Manufacturer Part Number | Century Spring - C-303 | | Material | Spring Steel Wire | | Material Type | Spring Steel Wire | | Model Number | Century Spring - C-303 | | Number of Items | 1 | | Number of Packs | 1 | | Number of Pieces | 1 | | UPC | 038594003039 | | Unit Count | 1 Count | ## 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 ![C-303 Extension Springs, 12" - Image 1](https://m.media-amazon.com/images/I/21s8DflxH0L.jpg) ![C-303 Extension Springs, 12" - Image 2](https://m.media-amazon.com/images/I/51+t0fAP4KL.jpg) ![C-303 Extension Springs, 12" - Image 3](https://m.media-amazon.com/images/I/314sEDYjLzL.jpg) ![C-303 Extension Springs, 12" - Image 4](https://m.media-amazon.com/images/I/21nwNCnh1GL.jpg) ![C-303 Extension Springs, 12" - Image 5](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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.it/products/41425387-c-303-extension-springs-12](https://www.desertcart.it/products/41425387-c-303-extension-springs-12) --- *Product available on Desertcart Italy* *Store origin: IT* *Last updated: 2026-09-29*