Torsion Springs Music Wire

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d (mm) min max

D₀ (mm) min max

Fig min max

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Part Number	L/R	d (mm)	D₀ (mm)	Fig	Degº	T (N/mm)	1/2 E (mm)	M (mm)	E (mm)	A (mm)
T016210125L	L	0.41	4.78	6	210	12.00	9.52	3.18	19.05	3.43
T016210125R	R	0.41	4.78	6	210	12.00	9.52	3.18	19.05	3.43
T016300125L	L	0.41	4.78	7	300	12.00	9.52	3.18	19.05	4.55
T016300125R	R	0.41	4.78	7	300	12.00	9.52	3.18	19.05	4.55
T016120125L	L	0.41	4.83	5	120	12.00	9.52	3.18	19.05	2.31
T016120125R	R	0.41	4.83	5	120	12.00	9.52	3.18	19.05	2.31
T020300187L	L	0.51	6.93	7	300	20.00	12.70	4.75	25.40	5.66
T020300187R	R	0.51	6.93	7	300	20.00	12.70	4.75	25.40	5.66
T020210187L	L	0.51	6.96	6	210	20.00	12.70	4.75	25.40	4.27
T020210187R	R	0.51	6.96	6	210	20.00	12.70	4.75	25.40	4.27
T020120187L	L	0.51	6.99	5	120	20.00	12.70	4.75	25.40	2.87
T020120187R	R	0.51	6.99	5	120	20.00	12.70	4.75	25.40	2.87
T024300250L	L	0.61	9.12	7	300	32.00	12.70	6.35	25.40	6.81
T024300250R	R	0.61	9.12	7	300	32.00	12.70	6.35	25.40	6.81
T024210250L	L	0.61	9.14	6	210	32.00	12.70	6.35	25.40	5.13
T024210250R	R	0.61	9.14	6	210	32.00	12.70	6.35	25.40	5.13
T024120250L	L	0.61	9.19	5	120	32.00	12.70	6.35	25.40	3.45
T024120250R	R	0.61	9.19	5	120	32.00	12.70	6.35	25.40	3.45
T026210250L	L	0.66	9.25	6	210	43.00	12.70	6.35	25.40	5.56
T026210250R	R	0.66	9.25	6	210	43.00	12.70	6.35	25.40	5.56

TORSION SPRINGS

SPEC torsion springs are widely useful to store and release energy of rotation or to maintain pressure over a short distance. Our stock selection includes stainless steel torsion springs with four end positions, and music wire springs with three end positions as shown in the drawings.

MATERIALS

Stainless steel: Type 302 as per ASTM A313 or AMS 5688

spring temper

Music wire: ASTM-A228 or AMS 5112

DIRECTION OF HELIX

Must be specified by adding a suffix to the catalogue number. Use L for left-hand wound or R for right-hand wound. See Illustration For Example.

L R

TOLERANCES

Outer diameter ± 5% stainless steel

± 2% music wire

ADDITIONAL TECHNICAL DATA

SPEC torsion springs are normally used over a supporting mandrel or arbor. Suggested mandrel sizes allow about 10% clearance at the deflections 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. 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 suitable for average conditions. These values can be increased about 20% for static conditions with only slight setting.

To determine the load at any working length use rate proposed deflection.

ENDS

Straight torsion ends are standard.

FINISH

Plain finish is standard. Allow additional time for special finishes.

For inspection purposes, the load should be applied at 1/2 leg length (E). Using other lengths appreciably alters the active length of wire and affects the test results. The reference torque values listed can be translated to the approximate direct load by use of the formula P=T/En where P is the load applied at the new length En. Torque values at intermediate deflections can be calculated proportionally.

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