Mechanical Connecting Springs

Mechanical Spring Bal Spring® Product

Our versatile Bal Spring® canted coil spring is a proven solution for mechanical connecting challenges. Its size, simplicity, and multi-function capabilities can help you reduce system complexity and weight while improving performance. The Bal Spring performs latching, locking, and holding functions, it allows for tool-less installation, and it’s robust enough to withstand thousands of insertion/removal cycles.

Latching

Fastening two device parts together
while facilitating removal and
replacement over many cycles

Bal Spring® Mechanical Holding In Cycles
Locking

Permanently mating two device parts
together, making removal impossible without
damage to the part or spring

Bal Spring® Mechanical Holding and Locking
Holding

Retaining and aligning device parts and
facilitating sliding function through the use
of controlled spring force

Bal Spring® Mechanical Holding

Mechanical Spring Force

The Bal Spring® canted coil spring exhibits a unique deflection and force behavior when it’s compressed. Unlike typical spring technologies, our spring exerts a near-constant force across the working deflection range, and its forces remain consistent – even in wide temperature ranges. It resists compression set, and its individual coils compensate for misalignment, tolerance variations, and mating surface irregularities. By adjusting the spring groove, spring size, wire diameter and other characteristics, we can precisely control the force it takes to latch, lock, hold, connect, and disconnect. Spring forces can be precisely controlled from less than .5 lb. to >10,000 lb.

Spring-energized Force Graph
Bal Spring® Compression Diagram

Mechanical Spring Materials & Plating

Our Bal Spring® canted coil spring is available in a variety of wire materials and surface finishes to meet specific performance demands. To reduce the potential for corrosion between dissimilar metals, we can plate springs with a galvanically compatible material.

Wire Materials Include:
  • STAINLESS STEEL (302, 316, 316L)
  • MP35N®
  • PLATINUM IRIDIUM
  • TITANIUM
  • HASTELLOY®
  • INCONEL®
  • BERYLLIUM-COPPER
  • ZIRCONIUM-COPPER
Plating Options Include:
  • GOLD
  • SILVER
  • NICKEL
  • TIN

Mechanical Spring Sizes

Our Bal Spring® canted coil springs are available in a range of non-welded lengths (for simple or complex groove configurations), and in welded rings from 0.020 in. (.51 mm) ID. Since every spring is designed to meet the unique requirements of your application, we don’t stock a “standard” size and type. But we do maintain a database of commonly-requested diameters and cross-sections, which can serve as a baseline for streamlined customization.

Connecting Spring Sizes

This chart is provided solely as an illustration of common spring dimensions. Spring properties, including wire diameter, wire material, coil width, coil height, coil cant angle, spring ID/OD, and plating can be precisely customized for optimal performance.

Mechanical Spring Orientation

Our Bal Spring canted coil spring can be designed with coils that deflect in an axial or radial orientation. This makes it possible to optimize the direction of the force in your design, ensuring effective, long-term service. For housing or piston mounted designs, a radial spring orientation is typically recommended. Axial springs are often specified for face mounted installations.

Radial Spring

Compression force for a radial canted coil spring is along the radius of the arc or ring, perpendicular to the centerline.

Bal Spring® Axial Spring Diagram
Axial Spring

Compression force for an axial canted coil spring is along the axis of the arc or ring, parallel to the centerline.

Bal Spring® Radial Spring Diagram

Service conditions, spring configuration (length or ring), and other factors can influence this design choice. Our engineers will help you to determine which spring orientation delivers the best performance.

One Component, Three Functions

Mechanical
Connecting
EMI
Shielding

Some designers use the Bal Spring® canted coil spring to mechanically latch, lock, or hold critical machine components. Some use it to shield against EMI/RFI. Others leverage our spring’s ability to electrically conduct and ground. No matter how you choose to use it, you’ll increase performance, improve reliability, and gain a competitive edge.

Mechanical Spring Applications

Technical Resources

Product Catalog

Bal Seal Engineering Sealing, Connecting, Conducting, and Shielding Solutions

Application Bulletin

LQR® for Mechanical and Fastening Applications

Technical Report

Bal Seal Engineering Galvanic Compatibility

Custom components that drive tomorrow’s technologies.

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