Grundlagen & Definitionen

Crest-to-crest, nested, and interlaced.

1. Crest-to-crest — turns in series, crest resting on crest. Gives the lowest spring rate and the widest usable deflection for a given height, and covers most applications.
2. Nested — turns in phase and in parallel, for maximum load where the space is already fixed.
3. Interlaced — two coils wound together to reach a spring rate that neither would achieve alone.

The choice follows from whichever constraint is already locked. Fixed space with a high load points to nested; a fixed load that needs travel points to crest-to-crest. Anything outside those two is worth discussing with the manufacturer before the cavity is machined.

Five, ranked by what each one gives up.

1. Wave spring — the same load in roughly half the height, with comparable deflection. The standard substitution when a housing has grown too tall.
2. Belleville / disc washer — very high load in almost no height, but very little travel; stacks are used to buy back deflection.
3. Wave washer — a single-turn ring, correct for simple gap closing and not for controlled preload.
4. Elastomer or O-ring — inexpensive damping, but it creeps and is temperature-limited.
5. Gas spring — long stroke and near-constant force, at a far larger installed size.

Where the cavity is fixed and both a load and a deflection are specified, the wave spring is usually the only one of the five that satisfies all three constraints at once.

There are three structural families, then a choice of ends.

1. Single-turn — one ring carrying two to four waves, supplied with a gap, with an overlap, or as a plain closed circumference. Usable deflection is roughly 30–70 % of free height. Best for simple gap closing.
2. Multi-turn, waves opposed — a continuous coil in which the crest of each turn rests on the crest of the turn below. The turns act in series, so the spring rate falls as turns are added, and usable deflection widens to roughly 20–80 %. This is the workhorse geometry.
3. Nested — turns stacked in phase so they act in parallel, multiplying load within the same installed height. Deflection returns to roughly 30–70 %.

Two further variants exist: the linear wave spring, supplied as a straight length and formed to circumference at assembly, and the interlaced wave spring, in which two coils are wound together to reach a rate neither achieves alone. Independently of family, ends are either plain — the wire simply stops, so the last crest bears on a point — or shim ends, which add a flat ground bearing surface so load transfers evenly. At miniature diameters, shim ends are worth specifying by default.

Springs are classified by how they are loaded: compression springs are pushed shorter, extension springs are pulled longer, torsion springs are twisted about an axis, and constant-force springs uncoil a strip to deliver near-flat load over a long stroke. A wave spring belongs to the first group — it is a flat wire compression spring. Knowing where it sits in the family is what makes the selection quick: it competes with the round-wire helical compression spring on load, and with the Belleville disc washer on height, and it is chosen when neither of those two fits the cavity.

A wave spring stores and releases energy along an axis, exactly as a coil spring does, but in roughly half the height. Flat wire is edge-wound into a coil and waves are formed around each turn, so deflection comes from bending in those waves rather than from torsion in a stacked column of wire. In an assembly it performs one of four jobs: it applies preload, holding a bearing or a seal face in contact; it takes up axial tolerance and end play; it cushions shock; or it returns a moving part to position. It is specified whenever the load is fixed and the axial space is not negotiable.

Free diameter is the uninstalled, relaxed dimension of the ring before it is expanded or compressed for groove installation.

For internal rings, the free outer diameter is measured (larger than housing). For external rings, the free inner diameter is measured (smaller than shaft) to ensure proper groove cling.

A laminar ring is a specific variation of spiral rings stacked together to form a labyrinth seal, preventing dust and grease leakage in bearing assemblies.

A single multi-turn ring is engineered as one unified component, preventing internal friction, misalignment, and installation errors seen when nesting loose single rings.

Heavy-duty configurations utilize flat wire thicknesses ranging from 1.0 mm up to 4.0 mm or more for large heavy-industrial shafts.

Standard multi-turn spiral rings are highly symmetrical, which provides outstanding balance and smooth performance in rotating machinery.

Spiral rings typically feature a small, uniform gap between the wire ends or a overlapping configuration depending on specific clearance requirements.

The primary function is to replace traditional bulky fastening components (like nuts, threaded collars, cotter pins) by acting as a removable shoulder to secure parts axially.

Yes, parameters like diameter, turn count, wire thickness, and material can be customized easily through coiling machine programming changes.

A constant-section ring is also made of flat wire with a uniform cross-section, but it typically has a single turn with a gap, unlike multi-turn spiral rings.

They are designed to interchange with standard industrial and military configurations, complying with aerospace specifications (AS) and standard global industrial groove dimensions.

A self-locking ring features a tab-and-slot design on the turns that mechanically locks the ring into the groove under high rotational speeds, preventing it from expanding due to centrifugal forces.

Light-duty rings have thinner wire cross-sections for low loads and tight spaces. Heavy-duty rings feature wider and thicker wire profiles designed to withstand extreme thrust forces.

Because they are manufactured using an edgewise coiling process rather than stamping dies, custom sizes can be produced rapidly without expensive tooling charges.

An external spiral ring is designed to contract securely into a groove machined on the outside diameter of a shaft or pin.