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1. Deflected Degrees ()
This is the maximum deflection for all springs. Springs deflected more may take a set. It should be noted that all springs should be deflected in the direction which will wind the spring. Unwinding the spring will cause premature set, and is not recommended.
2. Inside Diameter (ID)
For springs manufactured to O.D., the I.D. can be computed by subtracting 2 wire diameters ("d") from the O.D.
3. Leg Length (E)
It is the distance from the center axis of the coil body to the end of the leg. See catalog for values.
4. Minimum Axial Space ()
Recommended space along shaft for the spring under full deflection. The published values provide clearance for the spring to prevent binding. The axial space does not indicate the width of the coil body.
5. Outside Diameter (OD)
The catalog lists the O.D. for each spring. All have a tolerance of ±5%.
6. Position of Ends ()
The end positions are of 4 types. Each end type is shown on the torsion spring preface page of the catalog. The initial leg position is represented using solid lines, and the final position is represented using dashed lines. The listed torque "M" is measured at the final position.
7. Radius (R)
The radius is the point at which the load is applied to check the torque at manufacturing. It is measured from the center axis of the spring. In all cases the radius is .5 of the leg length "E". Radius is not .5 of the O.D.
8. Suggested Mandrel ()
This is the maximum suggested mandrel size which should be inserted through the spring I.D. The mandrel is smaller than the spring I.D. to allow for sufficient clearance when the spring is fully deflected. Too large of a mandrel may cause binding and/or distorsion.
9. Torque (M)
The torque values for all springs can be found in the catalog, and are given as reference only.
10. Wire Diameter (D)
Normally, wire diameter is as specified in the catalog. Tolerances are as per the material specifications to which it is purchased. . Distortion during coiling changes the wire diameter slightly. It is suggested that tolerances for drawings be ± .001" of the published value.
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