Multiple Turn

Crest-To-Crest

• Low-Medium Force
• Low-Medium Spring Rate
• Long Deflection
• Precise Load/Deflection Characteristics

Crest-to-Crest Spirawave flat wire compression springs are pre-stacked in series, decreasing the spring rate by a factor relative to the number of turns.

Equations

Note:
N must be in 1/2 wave increments.
Z = Number of active turns.

Nomenclature

b = Radial Wall, in. [(O.D. - I.D.) ÷ 2]
Dm = Mean Diameter, in. [(O.D. + I.D.) ÷ 2]
E = Modulus of Elasticity (psi)
f = Deflection (in.)
H = Free height (in.)
I.D. = Inside Diameter (in.)
K = Multiple Wave Factor
L = Length, overall Linear (in.)
N = Number of Waves (per turn)
O.D. = Outside Diameter (in.)
P = Load (lb.)
S = Operating Stress (psi)
t = Thickness of Material (in.)
W.H. = Work Height (in.) [H-f]
Z = Number of Turns