--- product_id: 41425387 title: "C-303 Extension Springs, 12\"" brand: "century spring" price: "NT$1009" currency: TWD in_stock: true reviews_count: 4 category: "Century Spring" url: https://www.desertcart.tw/products/41425387-c-303-extension-springs-12 store_origin: TW region: Taiwan --- # 12-inch precision length 35.4 lb max safe load Made in USA quality C-303 Extension Springs, 12" **Brand:** century spring **Price:** NT$1009 **Availability:** ✅ In Stock ## Summary > ⚙️ Elevate your tension game with the C-303 – where strength meets precision! ## Quick Answers - **What is this?** C-303 Extension Springs, 12" by century spring - **How much does it cost?** NT$1009 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/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 - • **Lightweight Yet Strong:** Only 23 grams but built to withstand demanding applications. - • **Proudly Made in the USA:** Support domestic manufacturing with trusted quality assurance. - • **Precision 12-Inch Length:** Engineered for exact tensioning needs, perfect for sail shades and more. - • **Premium Spring Steel Wire:** Crafted from high-grade material for long-lasting resilience. - • **Robust 35.4 lb Load Capacity:** Handles heavy-duty tension without compromising durability. ## Overview The Century Spring C-303 Extension Spring is a 12-inch, spring steel wire tension spring designed to safely handle loads up to 35.4 lbs. Made in the USA, it offers reliable performance for industrial and mechanical applications, including sail shade tensioning, combining durability with precision engineering. ## 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 | #340,274 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #244 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 Grams | | 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 Pieces | 1 | | UPC | 038594003039 | | Unit Count | 1.0 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.tw/products/41425387-c-303-extension-springs-12](https://www.desertcart.tw/products/41425387-c-303-extension-springs-12) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-06-27*