What is the purpose of dead coils in the middle of a compression

What purpose do dead coils in the middle of a spring serve? For example, this spring from a ballpoint pen has two dead coils at each end and two in the center of the spring. Why add dead coils in the

Compression Springs Resources Helical Compression Spring Design

Industrial Spring Corporation Compression Spring Technical Information - Industrial Spring Corporation

Test] FOX DHX2 & Float X2 - Shock vs. Shock

Non-standard spring calculation

Light Compression Springs Compression Spring Over 70 Trillion spring designs

Active and Dead Coils of a Compression Spring Compression springs can consist of active coils and dead (inactive) coils. The active coils can take stress or loads. The dead (inactive) coils

Compression Springs: Calculation Formulas

Design equations and principles of compression springs

Why do springs get harder to compress? - Engineering Stack Exchange

What is Pitch in Coil Springs? Compression Springs, Extension Springs, Torsion Springs and Conical Springs in Stock

What is a compression spring? - Compression springs - FAQ