Usbellows logo.png
EJMA Logo

US Bellows is a Standards Subscriber | Exp: Dec 31, 2026 | See ejma.org to check verification process
Celebrating over 20 years of EJMA membership

What is free length in an expansion joint bellows?

Free length is the neutral length of the expansion joint bellows. This is the length of the bellows that has neither been compressed nor extended.