Product Overview
Century Spring A9-45CS Helical Compression Spring 0.406" OD x 1.34" Free Length
Condition
New old stock. Clean zinc-plated finish with squared, closed and ground ends. Stored in clean surplus inventory.
Same or next business day shipping from our Idaho warehouse. Reliable parts since 1999. Honest pricing, no nonsense.
We are here for our customers, with a no-hassle satisfaction guarantee.
Product Overview
The Century Spring A9-45CS (also cataloged as A9-45) is a precision helical compression spring engineered for reliable linear resistance in mechanical assemblies, fixtures, and replacement mechanisms. Manufactured from spring steel with zinc plating for corrosion resistance, it features closed and ground ends to ensure square seating and uniform load distribution along its axis.
Key Features
- Outer Diameter (OD): 0.406 in (10.31 mm)
- Inside Diameter (ID): 0.322 in (8.18 mm)
- Free Length: 1.34 in (34.04 mm)
- Wire Diameter: 0.042 in (1.07 mm)
- Solid Height: 0.62 in (15.75 mm)
- Spring Rate: 7.3 lbs/in (1.3 N/mm)
- Suggested Maximum Load: 5.3 lbs (23 N)
- Suggested Maximum Deflection: 0.72 in (18.29 mm)
- Material: Zinc-plated spring steel
- End Configuration: Closed and ground
Applications
- Replacing worn return springs in small machinery, tooling, and mechanical assemblies.
- Custom fixture building, prototyping, and mechanism design on the shop bench.
- Maker projects, robotics linkages, and small-scale automation requiring calibrated spring tension.
Frequently Asked Questions
Are the ends of this spring squared?
Yes. The A9-45CS features closed and ground ends, allowing it to sit flat and square against mounting surfaces without wobbling under compression.
What is the spring rate?
This spring is rated at 7.3 pounds per inch (1.3 N/mm) of deflection, with a suggested maximum working load of 5.3 pounds.
Why buy individual springs here rather than a bulk factory pack?
You get the exact quantity you need for your repair or build without paying for a standard minimum industrial pack or waiting on distributor lead times. Every order ships from our Idaho warehouse for a flat $8 rate, ships free once your cart reaches $28, and leaves the same or next business day.
A clean, square-ground compression spring that provides predictable mechanical push right where your build needs it. Ready to slip onto your guide rod and get back to work.
