Stock sizes in stainless steel
Associated Spring torsion springs are widely used to store and release
energy of rotation or to maintain a pressure over a short distance. Our
stock selection includes torsion springs with four end positions, as
shown in the drawings on this page.
SPEC torsion springs are normally used over a supporting mandrel or
arbor. Suggested mandrel sizes allow about 10% clearance at the deflection
listed. If greater deflections are used, the arbor size should be reduced.
Sufficient room (minimum axial space) must be provided in the assembly
for the spring to function properly. The minimum axial space does not
refer to the length of the coils.
SPEC torsion springs should be used in the direction that winds the
coils. In the unwinding direction the maximum load is lower because of
residual stresses.
Torque values listed are recommended maximum torques. These values can be increased
about 20% for static conditions with only slight setting.
For inspection purposes the load should be applied at 1/2 leg length
(E). Using other lengths appreciably alter the active length of wire
and affect the test results.
The reference torque values listed can be translated to the approximate direct
load by use of the formula p = M / E n where P is the load applied at the new
length E n . Example: For part T012-090-055, what is the load when e n = 0.187
? P = M / E n = 0.047 / 0.187 = 0.25 lb.
The torque values listed will be attained at the deflections listed.
Torque values at intermediate deflections can be computed by direct proration.
Example: For part T030-180-250, the torque at 90 deg deflection is 0.312
in-lb.
Material
Stainless Steel Type 302 - ASTM-A313 or AMS 5688 spring tempered (chemical & physical
only).
No charge for certificate of compliance when requested; certificate
of chemical analysis available, see price book.
Direction of Helix
Must be specified by suffix to catalogue number. Use L for left-hand
wound, R for right-hand wound.
Ends
Straight torsion ends are standard.
Finishes
Plain finish is standard. Allow additional time for special finishes.
Tolerances
Torque is for reference only and should not be specified
O.D. ± 2%
