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Dals Int'l Inc. distributes torsion springs in wire diameters from 0.1mm to 14.0mm diameter from small to very high volume.
For those potential users of very high volumes where wire diameters are below about 1.6mm diameter then we have high speed torsion coilers designed and built to give you very competitive unit prices with a high product quality.

Torsion springs are stressed in bending or tensile, as some prefer to call it. There is often confusion with these springs,
which are essentially a helically coiled body with some kind of leg end fixings. They function by winding up or by unwinding.
 However it is always preferable to design them to function in winding up mode i.e. the number of turns in the spring increasing as the diameter reduces, this is because the maximum operating stresses are considerably higher when winding up.

Torsion springs can be single (one helical body) or double (two helical bodies with a connecting piece) mostly coiled from round wire but other cross sections are often used. They can be close coiled or open coiled and generally this will depend on fit and function requirements where advise from experienced designers is important and no simple general set of rules can apply. There are other structural forms of torsion springs, which are more complex in function but are necessitated by the assembly product actuation system. Here are examples of some commonly used end forms:

The torque exhibited by torsion springs is generally linear but there may be other considerations that have to be noted when evolving a design. Friction between spring and helical body support pin can have an affect. Torsion springs that have long legs or connecting pieces will have some deflection in them which will affect the desired torque / force required in the design

Applications:

Mainly for Circuit Breakers, electrical switches, stationary articles, textile machinery, automobile components, clothing pins, packing, hand tools, furniture & hardware products, switchgear products, Xerox machine and various types of machine components.

Dals Int'l Inc distributes a very broad range of compression springs in terms of both size and complexity of shape. We can coil them from wires as small as 0.1mm diameter up to 14.0mm diameter.

By far the most commonly used type of spring. In its simplest form it is possibly the most economic spring to use by virtue of the lower material content and the speed at which they can be produced versus the amount of energy it can store.

Compression springs are made from round, square, rectangular, trapezoidal, oval or even special shaped wire cross sections but round wire is by far the most common and easier to work with. The reasons for choosing the other material cross sections is varied but it is usually based on either strength for volume or dynamic considerations of the application.

The shape of the compression spring is mostly parallel sided i.e. of nominally constant diameter but is often seen as a conical shape and sometimes barrel or waisted (hourglass) shape. These alternative shapes are often again related to strength for volume but you are penalized for loss of a nominally linear spring rate.

Using compression springs nested together i.e. one inside the other is not uncommon, and this would be to achieve strength for volume or dynamic effects.

Most often compression springs have closed ends for stability and these are very often ground flat to square for that benefit. It does however increase the cost and is to be avoided whenever possible and would generally be considered un-necessary on wires less than 0.5mm diameter.

Applications:

All types of Electrical & electronic switches, switchgear products, circuit breakers, relays, electrical & electronics parts, cassette player, typewriter, toys, door & luggage locks, gas regulator & lighter, short cores & long cores tube valves, aerosols spray & pump valves. All types of hardware & sanitary products, aerospace, consumer durable products, textile machinery, quick release coupling, computer hardware & printer, automobiles components, Xerox machine, ball pens & clutch pencils and any types of engineering products.

Offer many economical options for basic door/panel latching

90 degree pawl rotation uses simple froction for quick, easy latching 

Many styles available to match specific frame geometries