Custom Springs

Precision custom spring design, rapid prototyping, and volume manufacturing — engineered precisely for applications where standard catalog springs cannot meet your exacting performance envelope.

When standard stock springs do not satisfy your specific dimensional constraints, load profiles, or environmental parameters, TOSTA delivers full-spectrum custom spring engineering. Backed by 30,000+ catalog standard parts and advanced CNC multi-axis coiling equipment, we support your project from initial concept and DFM review to 1–3 day prototyping and high-volume mass production.

Custom Engineering Process

Requirement Review

In-depth evaluation of your application envelope, target load/deflection values, operating temperature, and cycle life requirements.

Engineering & DFM

TOSTA spring engineers perform parametric calculations, stress optimization, material selection, and manufacturability review.

Quotation & Specs

Comprehensive technical proposal, engineering approval drawings, and transparent tiered pricing delivered within 24–48 hours.

Rapid Prototyping

Precision prototype samples produced in 1–3 business days for dimensional fitting, assembly trial, and physical load verification.

Production & Delivery

Full CNC volume production with strict SPC quality inspection, lot traceability, PPAP documentation, and reliable global delivery.

When to Specify a Custom Spring

Specific load, stiffness, or deflection curves outside standard catalog limits

Constrained physical installation cavities requiring non-standard diameter-to-length ratios

Elevated temperature, cryogenic, or severe chemical corrosion working conditions

Extended fatigue cycle requirements (>10⁷ cycles) demanding specialized wire and peening

Complex custom hook configurations, variable pitches, or dual-rate spring geometries

Small-batch specialized production or custom pilot runs prior to full commercial rollout

TOSTA Custom Capabilities

Material Selection

Stainless steel (302, 304, 316, 17-7PH), high-carbon music wire, alloy spring steel (55CrSi, 50CrV4), and nickel superalloys (Inconel X-750, 718, Monel).

Dimensional Range

Coil wire diameters from 0.08 mm to 10.0 mm (0.003" to 0.400"), accommodating micro-miniature electronic components to heavy-duty machinery.

Surface Finishing

High-intensity shot peening, zinc electroplating, electroless nickel, black oxide, chemical passivation, phosphate, and PTFE coatings.

Rapid Turnaround

Formal engineering quote and design feedback within 24–48 hours; custom prototype samples manufactured and shipped in 1–3 days.

Submit Custom Quote Request Contact Application Engineers