How Long Is the Lead Time for Customized Sport Sunglasses?

Lead time is the sum of discrete factory and supply-chain phases: concept sampling, mold/tooling, lens procurement (cut-to-shape, polarization/coatings), mass production, quality control, packaging and logistics. Typical ranges: prototype/sample 7–14 days; injection-tooling 2–6+ weeks (complex molds longer); mass production 2–6 weeks depending on volume and cavities; final QC and packing 3–7 days. Each phase can be performed sequentially or overlapped — concurrent tooling and lens ordering shortens calendar time but requires upfront approval of drawings and materials. The largest single time drivers are new-frame tooling complexity, custom lens finishes (AR, mirror, polarization) and supplier lead times for specialty optics.

Tooling is usually the critical path for custom frames. Simple single-cavity aluminum soft tooling can be produced in 1–3 weeks for low-volume prototypes; hardened steel multi-cavity production molds often require 3–8 weeks (or more for complex geometries and EDM finishing). Tool revisions add full-mold cycles. For sunglasses wholesale customers, a new steel mold amortized over high volumes speeds per-piece cost but increases up-front lead time. Workarounds: approve a rapid prototype using SLA or CNC to validate fit, then start mold fabrication while pre-ordering lenses and components so production begins immediately after mold completion. KARUSON recommends fixed milestone approvals (2D drawing signoff, physical prototype approval) to avoid unexpected mold rework that adds 2–4 weeks per iteration.

Yes — specialized lens processes are outsourced to optics suppliers and commonly add 7–21 days depending on treatment complexity. Examples: polarization and basic tinting are faster (7–14 days), multi-layer AR coatings, mirror vacuum-metalized finishes, and hydrophobic/oleophobic topcoats often require additional cure times, batch runs, and QA that extend lead time. Coating vendors may also enforce minimum batch quantities and lead times that don’t align with frame schedules. To control this, specify from suppliers with confirmed capacity and lead-time SLAs early, consider stocking standard lens blanks that can be cut in-house, or agree to staged delivery (frames first, specialty lenses delivered in subsequent shipment) when possible.

MOQ influences scheduling more than unit speed. Factories typically schedule runs by lot size; lower MOQs (for example, under typical 300–1,000 per SKU ranges common in many factories) may be queued into later production windows or require air-freight of components, both increasing lead time and cost. Higher MOQs often justify dedicated production slots and multiple-cavity molds, which shortens per-piece production time but increases upfront delivery from tooling and materials. For sunglasses wholesale buyers, plan MOQ-driven timing: consolidate SKUs to meet MOQ on fewer toolings, accept colorway batching, or pay for expedited runs if small MOQ is unavoidable. KARUSON’s eyewear factory planning models can show trade-offs between MOQ, unit cost, and calendar lead time for precise decision-making.

Shipping adds significant calendar risk. Typical transit: air freight 3–7 days door-to-door (subject to consolidation waits); sea freight 20–45 days depending on routing and port congestion. Add customs clearance (1–14 days) — affected by documentation quality, tariffs, and inspection selection. For regulated markets, additional product testing documentation (technical files, lab reports) can cause holds. Accurate estimation requires visibility on three elements: chosen transport mode and weekly sailing/flight schedules, the factory’s readiness date, and import-side clearance procedures. Mitigation: use DDP terms to transfer customs responsibility to an experienced forwarder, pre-submit customs paperwork, build buffer weeks into launch plans, and, for time-sensitive wholesale windows, opt for air or partial shipments.

Robust QC adds time but prevents expensive rework. Important steps: incoming raw-material inspection (frame resin, hinges, screws), dimensional inspection against drawings, lens optical checks (power, polarization efficiency, spectral transmission), coating adhesion and visual inspection under KPI lighting, mechanical tests (hinges, drop/impact where applicable), and packaging validation. Regulatory or certification testing (lab reports for UV protection, regional standards) can add days to weeks depending on lab throughput. To reduce delays, align QC criteria with the factory during contract negotiation, use pre-approved suppliers for critical components, accept staged inspection releases (for example, QC approval by batch) and maintain a small buffer inventory of critical components. KARUSON recommends conditional release procedures that permit partial shipments while final lot testing completes for larger wholesale orders.