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Lee Spring manufactures almost 1000 Stock Torsion Spring Designs in wire size ranging from .012" to .135". Both left hand and right hand wound products are carried for your convenience.

Torsion Springs (LTL/LTR Series)

• Wire size: .012"- .135"
• Materials: Choose Plated Music Wire or Passivated Type 302 Stainless Steel
• Direction of Wind: Good design dictates that torsion springs should be used in the direction that winds the coil. Stock Torsion Springs are stocked in both Left (LTL) or Right (LTR) hand wind.
• Legs: Lee Spring Stock Torsion Springs are offered with legs of equal length oriented at varying unloaded angles.
• Mandrel Size: .065" to 1.88".
  Note: generally, torsion springs are used over a mandrel (shaft or arbor). Lee Spring's Stock Torsion Spring specifications reference "Suggested Mandrel Size, Inches" which allows approximately a 10% clearance for the various deflections available (i.e., 90 degrees, 180 degrees, 270 degrees and 360 degrees.) If you require greater deflections, a suitable reduction in the mandrel size is suggested.

Overview

TORSION SPRINGS are helical springs that exert a torque or rotary force. The ends of torsion springs are attached to other components, and when those components rotate around the center of the spring, the spring tries to push them back to their original position. Although the name implies otherwise, torsion springs are subjected to bending stress rather than torsional stress. They can store and release angular energy or statically hold a mechanism in place by deflecting the legs about the body centerline axis.

This type of spring is normally close wound but can have pitch to reduce friction between the coils. They offer resistance to twist or rotationally applied force. Depending on the application, torsion springs can be designed to work in a clockwise or counter-clockwise rotation, thus determining the direction of the wind.

Materials

All of Lee Spring's music wire Stock Springs are plated, offering added protection against corrosion. Music wire Standard Series Springs are supplied zinc plated. Music wire is a common high-carbon steel alloy used for spring manufacture. It is cold drawn and offers uniform tensile strength..

Music wire springs are not recommended for applications where the temperature exceeds 121º C (250º F.)

Music Wire is highly magnetic.

Stainless Steel 302, used in Lee Spring's Stock Springs, exhibits good corrosion resistance for all applications. Lee Spring passivates all Stainless Steel Stock Springs to remove contaminants and improve resistance to corrosion. Stainless steel springs are not recommended for applications where the temperature exceeds 260º C (500º F). Type 302 stainless steel is slightly magnetic. Surface of stainless steel may have a residue of nickel on the surface. This is normal and will not affect the function of the part.

Applications

Common torsion springs are used in clothes pins, clipboards, swing-down tailgates and garage doors,. Torsion springs are used for hinges, counterbalances and lever return applications. Sizes range from miniature, used in electronic devices, to large torsion springs used in chair control units. Load should be applied in the direction of wind; unwinding from the free position is not recommended. As they wind up, torsion springs reduce in diameter and their body length becomes longer. This should be considered when design space is limited. Torsion Springs perform best when supported by a rod or tube. The designer should consider the effects of friction and arm deflection on the torque.

Parameters

Dimensions: Inner Diameter, Outer Diameter, Wire Diameter, and Spring Length.

Performance factors

Spring Rate, Maximum Deflection, Maximum Load and Wind Specifications.

Unit of Measure