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 reference 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 catalog 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. ± 5%

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Stock Sizes in Music Wire
Associated Spring music wire torsion springs are designed to complement our stainless steel torsion spring line. The music wire springs come in three end positions and offer alternate positioning to the stainless steel line. Standard mandrel sizes are maintained throughtout the music wire torsion selection. SPEC torsion springs are designed to be used over a mandrel or arbor. Mandrel sizes allow for about 10% clearance at the deflections listed. If greater deflections are used, the mandrel size should be reduced. Sufficient room (minimum axial space) must be provided in the assembly to function properly. The minimum axial space does not refer to the length of the coils.

Torque values listed are for physical selection only and should not be specified as part of a test or inspection procedure.

Material

	Music wire - Per ASTM-A228 or AMS 5112
	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 catalog number. Use L for left-hand wound, R for right-hand wound.

Ends
Straight torsion ends are standard

Finishes
Standard finish is that of the normal wire.

Tolerances

	Torque is for reference only and should not be specified
	O.D. ± 2%

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