Product Overview
Century Spring S-527CS Precision Helical Extension Spring
Condition
New old stock. Clean, unused surplus condition with intact machine loops and uniform coil spacing. Sold individually.
Ships same or next business day from our Idaho warehouse. Honest pricing, no nonsense.
Online since 1999. We are here for our customers, with a no-hassle satisfaction guarantee.
Product Overview
Century Spring part number S-527CS (catalog model S-527) is a precision helical extension spring manufactured from 302/304 stainless steel. Featuring full crossover machine loops on both ends, it provides a linear spring rate of 0.47 lbs/in with an initial tension of 0.20 lb. Designed for tension return, counterbalancing, and mechanism retraction in mechanical, industrial, and prototyping assemblies.
Key Features
- Material: 302/304 stainless steel
- End configuration: Full machine loops
- Outside diameter: 0.188 in (4.78 mm)
- Free length: 2.00 in (50.8 mm)
- Wire diameter: 0.020 in (0.51 mm)
- Spring rate: 0.47 lbs/in (0.08 N/mm)
- Initial tension: 0.20 lb (0.09 kg)
- Suggested maximum load: 1.5 lbf (6.67 N)
- Suggested maximum deflection: 2.80 in (71.12 mm)
Applications
- Replacing worn tension springs in laboratory instruments, precision linkages, and optical mechanisms
- Restoring return tension on vintage audio equipment, tape transport arms, and turntable mechanisms
- Bench prototyping for robotics, model engineering, custom jigs, and specialized hobby mechanisms
Frequently Asked Questions
What material is this extension spring made from?
This spring is formed from 302/304 stainless steel, offering corrosion resistance for standard industrial, laboratory, and hobby environments without requiring additional plating.
What type of end loops are formed on the S-527CS?
It features standard full machine loops (crossover loops) aligned inline with the spring body, ready to anchor onto standard pins, posts, or eyelets.
Why buy individual extension springs here instead of a large bulk assortment?
Generic hardware assortments rarely give you verified wire diameter, rate, and alloy specs, leaving you guessing on tension. Buying verified Century Spring units lets you order the exact quantity needed for your build or repair without paying for dozens of wrong-sized parts. Orders ship for a flat $8 rate, ship free over $28, and depart our Idaho warehouse the same or next business day.
Clean stainless coils and honest specs ready to drop into a fussy mechanism and pull its own weight.
