About Extension Springs

The extension spring is a helical cylindrical spring with coils adjoining each other capable of carrying the outer opposing forces actuating apart in its axis.

Dimensions

d	wire diameter [mm, in]
D	mean spring diameter [mm, in]
D 1	outside spring diameter [mm, in]
D 2	inside spring diameter [mm, in]
H	working deflection [mm, in]
t	pitch of active coils in free state [mm, in]
o	eye height [mm, in]
s x	spring deflection [mm, in]
L x	spring length [mm, in]
F x	working force exerted by the spring [N, lb]
W 8	deformation energy [J, ft lb]
x	index responding with the spring state

Coiling

1. Right (usually)
2. Left (must be notified in words)

States

1. Free: the spring is not loaded (index 0)
2. Preloaded: smallest working load is applied to the spring (index 1)
3. Fully loaded: maximum working load is applied to the spring (index 8)
4. Limit: the spring is depressed up to coil touching (index 9)