--- product_id: 61159320 title: "Century Spring C-339 10\" Extension Springs with 1-1/4\" Outside Diameter" brand: "century spring" price: "€ 40.72" currency: EUR in_stock: true reviews_count: 8 url: https://www.desertcart.hr/products/61159320-century-spring-c-339-10-extension-springs-with-1-1 store_origin: HR region: Croatia --- # 10" length precision 73.7 lbs max safe load 0.148" durable wire gauge Century Spring C-339 10" Extension Springs with 1-1/4" Outside Diameter **Brand:** century spring **Price:** € 40.72 **Availability:** ✅ In Stock ## Summary > ⚙️ Spring into strength with Century’s precision power! ## Quick Answers - **What is this?** Century Spring C-339 10" Extension Springs with 1-1/4" Outside Diameter by century spring - **How much does it cost?** € 40.72 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/61159320-century-spring-c-339-10-extension-springs-with-1-1) ## 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 - • **High Load Capacity:** Supports up to 73.7 lbs safely, perfect for demanding applications - • **Optimal Wire Gauge:** 0.148-inch wire diameter balances strength and flexibility - • **Compact Yet Powerful:** 1.25" outside diameter fits tight spaces without compromising performance - • **Robust Steel Construction:** Crafted from high-grade steel ensuring long-lasting durability - • **Precision Engineered Length:** Exact 10-inch extension for reliable fit and function ## Overview The Century Spring C-339 is a 10-inch steel extension spring featuring a 0.148-inch wire diameter and a 1.25-inch outside diameter. Engineered to handle a maximum safe load of 73.7 lbs with a deflection capacity of 6.18 inches, it delivers reliable performance for home improvement and industrial needs. ## Description Century Spring C-339 10" Extension Springs with 1-1/4" Outside Diameter ## Features - 0.148 wire diameter - 6.18 maximum deflection - 73.7 maximum safe load ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Jensen (Home Improvement) | | Part Number | C-339 | | Item Weight | 0.811 ounces | | Product Dimensions | 1.25 x 1.25 x 10.25 inches | | Item model number | C-339 | | Material | Steel | | Item Package Quantity | 1 | | Measurement System | inch | | Batteries Included? | No | | Batteries Required? | No | ## Images ![Century Spring C-339 10" Extension Springs with 1-1/4" Outside Diameter - Image 1](https://m.media-amazon.com/images/I/41s9pCYGmpS.jpg) ## Questions & Answers **Q: Are both termination points full loops? Thank you.** A: No, they are 180 degree hooks. **Q: how far does this stretch?** A: I don't know, I never used it. Way to stiff for my application (attic folding stairs). I could not pull it with my hands. Hope this helps. **Q: Is it one spring or a set?** A: This is just one spring. **Q: What is the inside dimensions?** A: Inside diameter is about .954" a little over 15/16". ## Customer Reviews ### ⭐⭐⭐⭐⭐ It was correct part and came in on time *by R***. on December 10, 2024* It was correct part and came in on time ### ⭐⭐⭐⭐⭐ Attic Stair Repair Hero *by L***S on January 21, 2016* This is exactly what I needed to replace a old stretched out spring on my attic pull down stairs. I have a home with a Century attic ladder and it is nothing fancy but for years one of the sides has been constantly sagging and gradually getting worse. It didn't take me long to realize that the culprit was a spring that had caught on a bolt while the door was closed and then when opened it caused the spring to get deformed and stretched out...Well long story short, I have been looing forever to find a replacement spring and could never quite find exactly what I needed but when I stumbled across this one on Amazon it looked like it should fit the bill and it was cheap enough that it was worth it to take a chance. Well the gamble paid off and while it is a tiny bit shorter than the original spring it works perfectly. I couldn't recommend this more if you have a century attic stair like this...Century 8.9 ft. Spacemaker Wooden Attic Stair and need a replacement spring, then this is exactly what you need.***Update***I forgot to mention this before but I did have to cut a tiny bit off of one of the eyes of the spring in order for me to be able to get it to hook through the original spring mount. Also to be honest it was a huge pain in the rear to install. Since it is a tiny bit shorter than the original spring, that requires stretching it slightly to actually get it installed, which was definitely no picnic. However since this spring wasn't necessarily designed for this specific application I wasn't going to ding it on the review for those two issues. Especially since now that it is installed it works perfectly. ### ⭐⭐⭐⭐ Fold up attic stairs *by T***A on March 7, 2022* If they were just a little bit stronger they would be perfect. As they are, they work fine. They just don't pull the stars up tight, maybe 1/8" gap when closed. ## Frequently Bought Together - Century Spring C-339 10" Extension Springs with 1-1/4" Outside Diameter - Century Spring C-303 Extension Springs, 12" - Prime-Line SP 9677 Extension Spring, Spring Steel Construction, Nickel-Plated Finish, 0.148 GA x 1-1/4 In. x 10 In., Single Loop Open (Single Pack) --- ## 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.hr/products/61159320-century-spring-c-339-10-extension-springs-with-1-1](https://www.desertcart.hr/products/61159320-century-spring-c-339-10-extension-springs-with-1-1) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-16*