McMaster 9662K21 Compression Spring Stock, Pack of 5, Spring Steel, 36" Long, 0.438" OD, 0.342" ID

Always be ready for the perfect fit. These springs are extra long to cut a custom length whenever you need it. Their open ends make cutting easier but prevent them from standing on their own. You'll need to install them in a hole or over a shaft, or grind the ends flat.

Spring Steel — Strong and resilient, but best suited for dry environments since moisture will cause these springs to rust.

Spring Rate — To determine the spring rate of a cut spring, first multiply the spring rate given by the spring's original length, then divide the result by the cut length (in inches).