Drag to rotate 3D view; slider simulates compression travel. Schematic representation only; refer to technical drawings and load ratings for actual design.
Three Structural Topologies and Mechanical Equivalent Models
In mechanical design, space constraints dictate whether a spring must operate in series (multiplying stroke) or in parallel (multiplying load capacity).
Single-turn, multi-turn Crest-to-Crest, and nested wave springs form the three essential structural topologies that solve virtually any axial packaging challenge.
| Structural Type | Mechanical Model | Spring Rate (k) | Stroke Capacity | Primary Application |
|---|---|---|---|---|
| Single-Turn (Gap/Overlap) | Single beam deflection | k = Baseline (100%) | Short (1mm - 5mm) | Bearing preload, end-play take-up |
| Crest-to-Crest Multi-Turn | N turns in Series | k_total = k / N (Lower) | Large (N x Stroke) | Valves, actuators, couplings, clutches |
| Nested Parallel Wave Spring | M turns in Parallel | k_total = M x k (Higher) | Short to Moderate | Heavy stamping dies, aerospace clamping |
Single-Turn Wave Springs: Champions of Ultra-Narrow Gaps
A single-turn wave spring consists of a single circular coil containing 2.5 to 6 wave crests. It requires minimal cavity height—often less than 3mm to 6mm total.
Available in Gap Type (featuring a radial gap that allows free circumferential expansion inside bores) and Overlap Type (where ends slide across each other for full 360° perimeter containment).
- Gap Type: Eliminates outer diameter binding when compressed inside a precision bore.
- Overlap Type: Recommended when mating parts possess radial clearance that could otherwise catch an open spring end.
Multi-Turn Crest-to-Crest Wave Springs: High Travel with Smooth Force
Crest-to-Crest wave springs are manufactured from a continuous flat-wire strip coiled into multiple turns, where the wave peaks of one turn directly align with and support the wave valleys of the adjacent turn.
Because the turns function in series, the total spring rate is inversely proportional to the number of turns (k_total = k_turn / N), while the maximum deflection travel increases linearly with turn count. Optional shim ends provide flat parallel bearing faces.
Nested Wave Springs: Massive Tonnage in Compact Diameters
Nested wave springs feature two, three, or more continuous flat-wire plies wound in parallel synchronization so that wave crests nest directly inside one another.
Because nested plies share load in parallel, total force rating multiplies directly (F_total = M x F_single) without requiring an increase in diameter or free height. They provide an outstanding compact alternative to disc spring stacks.
Frequently Asked Questions
- Can I stack multiple loose single-turn wave springs to create a multi-turn spring?
- It is strongly discouraged. Loose single-turn springs can rotate during dynamic cycling, causing wave crests to slip into valleys. This alters the spring rate unpredictably and can lead to binding. Always use one-piece Crest-to-Crest coiled springs instead.
- When should I choose shim-ends on a multi-turn wave spring?
- Specify shim-ends (flat parallel ground end turns) when the spring seats against soft mating materials (e.g. aluminum, bronze, or carbon seal faces), or when precise 360° uniform axial pressure is required.
- How does a nested wave spring differ from a multi-turn spring?
- A multi-turn spring stacks waves peak-to-peak (in series) to increase stroke. A nested wave spring nests waves into one another (in parallel) to multiply load capacity inside the same stroke envelope.
Related Engineering Guides
Have Specific Cavity Dimensions & Load Requirements?
Send us your Outer Diameter, Inner Diameter, Free Height, Working Height, and Target Load. Our engineering team will perform a free DFM review, FEA stress verification, and recommend optimal structures and materials. Standard catalog parts MOQ 1 piece.