The 18577 Extension Spring #77 (SRM77) is a durable tension spring designed to provide consistent pulling force in mechanical assemblies, equipment repairs, and general-purpose applications. Made from high-strength spring steel, this extension spring is built to stretch under load and return to its original length once the tension is released. With a 3/8" diameter and 6-1/4" length, it delivers reliable extension performance for mechanisms that depend on steady tension and repeatable movement—because springs should return to work every time, not decide they’re done for the day.
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Key Features / Specifications
Ideal For