TORSION SPRINGS

It is almost impossible to give proper specifications for a spring of this type except by means of a sample or a print or sketch.

The general specification as to diameter, length, gauge and number of coils can be given, but it is difficult to understand any description of special ends and avoid mistakes.

We therefore require complete information by sample or drawing on this class of spring. It is imperative always that we know the direction of the coils, i.e.- whether left- or right-hand, as a torsion spring should always be operated I the direction which causes the coil to close, or, in other word, causes the diameter to reduce. A spring operated in the wrong direction will either break or bend out of shape under comparatively little strain.

In drawing up specifications for torsion springs, observe the following points:

  • Diameter, stating whether inside or outside dimension.
  • Size of shaft or rod over which spring operates.
  • Number of coils required, and state whether right- or left-hand.
  • If the spring is assembled under tension, state how many turns are required to produce initial tension and the number if turns required beyond the initial point.
  • State how rapidly the spring operates
  • If required to carry a certain weight, specify how far from the centre of the coils this weight is applied, as leverage must be computed accordingly.
  • Show angles of arms by number of degrees of arc and show length of all bends and diameters of all eyes and hooks.

Consider that each turn will reduce the diameter and allow sufficient clearance between inside diameter of coil and diameter of rod or shaft. A spring which binds on shaft will break or set.

Consider also that each turn will elongate the coil a distance equal to the thickness of the wire of which it is made; allowances must be made for this elongation; if spring is confined, by coiling with sufficient space between coils to permit this elongation; if spring is closed coiled, the surrounding parts must be far enough apart to allow this movement.

Wire Diameter

d

mm

Outside Diameter

OD

mm

Body Length

LO

mm

Arm Length

A

mm

Recom Shaft Size

S.D.

mm

Relative Orientation of Arms

DIAG

Angular Deflection

DEG

Approx Number of Coils

Music Wire

Stainless Steel

Torque

N/mm

Product Code

Torque

N/mm

Product Code
0.35
5.25
1.5
15
3.5
1
90
3.25
4.5
T10100
3.6
T20100
3.0
2
180
6.55
T10110
T20110
4.5
3
270
9.75
T10120
T20120
6.0
4
360
13.0
T10130
T20130
0.42
5.50
1.80
15
4.0
1
90
3.25
9
T10140
7.2
T20140
3.80
2
180
6.55
T10150
T20150
5.40
3
270
9.75
T10160
T20160
7.20
4
360
13.0
T10170
T20170
0.51
6.00
2.20
20
4.0
1
90
3.25
18
T10180
14.4
T20180
4.40
2
180
6.55
T10190
T20190
6.60
3
270
9.75
T10200
T20200
8.80
4
360
13.0
T10210
T20210
0.61
6.25
2.60
25
4.0
1
90
3.25
36
T10220
28.8
T20220
5.20
2
180
6.55
T10230
T20230
7.80
3
270
9.75
T10240
T20240
10.40
4
360
13.0
T10250
T20250
0.75
7.25
3.20
30
4.50
1
90
3.25
72
T10260
57.6
T20260
6.40
2
180
6.55
T10270
T20270
9.60
3
270
9.75
T10280
T20280
12.80
4
360
13.0
T10290
T20290
0.91
7.75
4.0
35
4.70
1
90
3.25
144
T10300
115
T20300
8.0
2
180
6.55
T10310
T20310
12.0
3
270
9.75
T10320
T20320
16.0
4
360
13.0
T10330
T20330
1.10
8.50
4.70
40
5.0
1
90
3.25
288
T10340
230
T20340
8.0
2
180
6.55
T10350
T20350
12.0
3
270
9.75
T10360
T20360
16.0
4
360
13.0
T10370
T20370
1.37
10.30
6.0
50
6.0
1
90
3.25
576
T10380
461
T20380
12.0
2
180
6.55
T10390
T20390
18.0
3
270
9.75
T10400
T20400
24.0
4
360
13.0
T10410
T20410
1.82
16.0
7.75
60
10.0
1
90
3.25
1152
T10420
922
T20420
15.50
2
180
6.55
T10430
T20430
23.25
3
270
9.75
T10440
T20440
31.0
4
360
13.0
T10450
T20450
2.50
19.75
9.27
70
12.2
1
90
3.25
3304
T10460
1844
T20460
18.54
2
180
6.55
T10470
T20470
27.81
3
270
9.75
T10480
T20480
37.08
4
360
13.0
T10490
T20490

TORSION SPRINGS CAN BE MADE TO YOUR SPECIFIC DESIGN. FOR DETAILS PLEASE CONTACT OUR SPECIAL COMPONENTS DIVISION