Product Assembly – From Components to Finished Goods
Sub-assembly, final assembly, kitting and retail-ready packaging: machined parts, castings, molded components and hardware assembled with torque-controlled fastening, functional testing and packaging that ships direct to your warehouse, Amazon FBA or end customer.
Free ConsultationSub to Final
Assembly Scope
Calibrated Tools
Torque Control
Retail Ready
Packaging
5-10 Days
Lead Time
Materials
| Grade | Properties | Typical Applications |
|---|---|---|
| CNC Machined Components | Milled, turned and 5-axis parts in aluminum, steel, stainless, brass and engineering plastics – the precision elements your assembly is built around. Supplied from our own machining lines or yours. | Structural frames, brackets, shafts, bushings, housings, interface components |
| Die Cast & Molded Parts | Zinc and aluminum castings plus injection-molded components – the volume elements of most assemblies, produced in-house for schedule control. | Housings, covers, gears, connectors, decorative elements |
| Fasteners & Hardware | Standard and custom fasteners: machine screws, self-tappers, rivets, threaded inserts, retaining rings, springs, washers. Purchased from qualified suppliers with lot documentation. | Mechanical fastening, panel attachment, hinge and pivot joints |
| Adhesives, Seals & Lubricants | Structural adhesives, threadlockers, sealants, O-rings and gaskets, food-grade and specialty lubricants – applied with controlled processes and cure documentation where required. | Bonded joints, sealed assemblies, corrosion protection, smooth mechanisms |
| Electronics & Electrical (Case by Case) | Simple electrical assembly – wire harnesses, connectors, switches, sensors, PCBs mounted in enclosures – handled with ESD-safe practices. Complex PCBA is quoted case by case. | Powered products, sensor assemblies, wired devices, control boxes |
| Labels, Inserts & Packaging | Labels, instruction inserts, warranty cards, barcodes, desiccant, protective foam and retail boxes – applied, verified and packed in the assembly flow. | Retail-ready packaging, regulatory labeling, shipment protection |
Process Parameters
| Parameter | Standard Range |
|---|---|
| Assembly Order Size | From 50-piece pilot kits to 100,000+ annual volumes |
| Assembly Lead Time | 5-10 business days per batch (components available) |
| Torque Control Range | 0.1 – 50 N·m with calibrated tools and recorded values |
| Press-Fit & Crimp Control | Force-monitored presses with displacement verification |
| Functional Testing | Electrical, mechanical, leak and operational tests per your specification |
| Packaging Options | Bulk, kitted, retail box, blister, FBA prep, custom protective |
| Traceability Level | Serial number, lot, or batch – per your requirement |
| Component Sourcing | We supply from our lines, or assemble your supplied (consigned) parts |
| Assembly Drawings | Your drawings and BOM, or we draft assembly documentation from samples |
| Private Label Support | Your logo, packaging design and inserts – assembled and packed under your brand |
Surface Finishes
Retail Box Packaging
Finished goods packed into printed retail boxes with inserts, labels and instructions – the product arrives shelf-ready at your distributor or end customer.
Amazon FBA Prep
FnSKU labeling, poly bagging, bubble wrap, suffocation warnings where required, cartonization per Amazon requirements – boxes arrive at your FBA warehouse ready to receive without repacking.
Kitted & Bagged Hardware
Fasteners, seals and small parts bagged and labeled per assembly step or per unit – the standard for products your customer assembles, or for your own line-side supply.
Protective & ESD Packaging
Anti-static bags, conductive foam, desiccant and moisture barrier bags for electronics and sensitive assemblies; protective packaging for machined and plated surfaces.
Palletized Bulk Shipping
High-count production palletized with layer pads and stretch wrap, labeled per carton with lot and quantity – the economical route for replenishment orders.
Labeling & Marking
Barcode labels, serial numbers, revision marks, country-of-origin and regulatory labels applied and verified during assembly, with records retained for traceability.
Design for Manufacturing (DFM)
- Design for assembly: minimize part count and fastener count – every screw adds torque time, every orientation adds error risk. Snap-fits and dowels often beat threaded joints in assembly cost
- Specify assembly sequence and critical torque values on the drawing; ambiguous assemblies produce ambiguous products
- Make orientation foolproof: asymmetric features, poka-yoke tabs and visual cues prevent mis-assembly in ways that rely on operator memory alone
- Keep tolerances assembly-compatible: stack-up analysis on mating parts before production, so parts fit without forcing, selecting or reworking on the line
- Choose joining methods for serviceability: where your product must be disassembled for repair or warranty, design threaded or snap joints instead of permanent adhesive bonds
- Standardize fasteners across the product: fewer tool changes, fewer torque settings, lower error rate and simpler spares
- Plan testing access: functional test points, fill ports and connectors should be reachable without disassembly
- Design packaging into the product: shipping stresses, stacking loads and drop cases define required part strength and cushioning, not just the box
- Provide assembly drawings and a BOM – or send us a sample and we reverse-engineer the documentation and flag design-for-assembly improvements
- Send consigned components with inspection data where you supply them; incoming inspection on our side catches problems before they are built in
Tooling & Capacity
| Type | Lead Time | Suitable For |
|---|---|---|
| Assembly Fixtures & Jigs | 1-2 weeks | Repeatable positioning, alignment and fastening for volume assembly; poka-yoke features built in |
| Calibrated Tooling & Presses | Standard equipment; fixtures as above | Torque-controlled fastening (0.1-50 N·m), force-monitored press-fit, crimping and adhesive dispensing with recorded parameters |
| Functional Test Benches | 2-4 weeks for custom test fixtures | Electrical, mechanical, leak and operational testing with pass/fail recording per unit or per lot |
| Packing & Labeling Lines | 1-2 weeks setup | Kitting, retail packing, FBA prep, labeling and cartonization with verification steps |
Quality Assurance
- Incoming inspection of all components – ours and consigned – before assembly begins; defects caught here never reach a finished unit
- Torque verification: calibrated tools with recorded torque values on critical joints; periodic tool calibration on a fixed schedule
- First-article assembly check: the first unit of every batch is fully verified against the assembly drawing before the run continues
- Functional testing per specification with results recorded per unit or per sampling plan as agreed
- In-process inspection at defined assembly steps – the earlier a defect is caught, the cheaper it is to correct
- Label and packaging verification: correct labels, correct quantities, correct inserts, verified before cartons are sealed
- Serial or lot traceability where specified: component lots linked to finished units for warranty and recall capability
- Final visual inspection: completeness, cleanliness, correct revision and packaging presentation against the approved sample
- Retained samples from every batch for reference and dispute resolution
- Assembly records retained: operator, torque values, test results, component lots and packing details per batch
Applications
- Consumer products: hardware kits, furniture assemblies, sporting goods, household items, promotional products
- Industrial equipment: sub-assemblies, valve assemblies, pump assemblies, control boxes, cable harnesses
- Automotive aftermarket: repair kits, service parts, accessory assemblies with retail packaging
- Electronics: sensor assemblies, enclosure builds, wired devices, mounted-PCB products with ESD handling
- E-commerce and Amazon sellers: FBA-ready finished goods, kitted variants, private-label products
- Medical and laboratory: device sub-assemblies, kit assembly, clean-packed component sets
- Machinery OEMs: machine sub-assemblies shipped complete to reduce your line-side labor
- Startups and new products: pilot assembly runs before you invest in your own line
Why Choose FHY Precision
Components to finished goods in one place: we machine, cast, mold and assemble – your product does not bounce between suppliers, and schedule risk stays in one pair of hands
Torque and press control: calibrated tools with recorded values on critical joints, so assembly quality is documented, not remembered
Functional testing built in: test benches verify your product works before it is packed – catching build errors here instead of at your customer
Retail-ready and FBA packaging: products arrive shelf-ready or warehouse-ready, packed and labeled to your channel requirements
Consignment or supply: assemble your supplied parts, or let us supply everything from our own lines – your choice per program
Traceability on demand: serial, lot or batch tracking links finished units to component lots for warranty and recall readiness
Design-for-assembly feedback: we flag part-count, tolerance stack-up and orientation risks before the line starts, not after scrap accumulates
Pilot to volume: 50-piece pilot kits prove the process and packaging before you commit to volume pricing
FAQ
1. What assembly services do you actually provide?
Sub-assembly and final assembly with torque-controlled fastening, press-fit, adhesive bonding and simple electrical work; functional testing; kitting and bagging; retail, FBA and bulk packaging with labeling. If it involves putting our (or your) machined, cast and molded components together into a finished, packed unit, we can build it.
2. Can you assemble parts we supply from other factories?
Yes – consignment assembly is common. Send components with inspection data; we inspect incoming condition, assemble to your drawings, and flag any fit or quality issues before building. We can also supply some or all components from our own lines and mix both sources in one program.
3. What is the minimum assembly order?
Pilot kits from 50 pieces are practical; volume programs typically start around 500-1,000 pieces. Assembly setup (fixtures, test benches, packing lines) is the cost driver at low quantity, so pilot runs carry a setup charge that amortizes across volume.
4. How do you control torque and fastening quality?
Calibrated torque tools with recorded values on every critical joint, periodic tool calibration on a fixed schedule, and first-article verification on each batch. Where your drawing specifies torque windows, we hold and document them; where it does not, we propose values based on fastener size and material during DFM review.
5. Can you pack products for Amazon FBA?
Yes – FBA prep is one of our most requested services: FNSKU labeling, poly bagging with suffocation warnings where required, bubble wrap, cartonization per Amazon requirements and pallet labeling. Boxes arrive ready to receive at your FBA warehouse without repacking on your side.
6. Do you support private label and custom packaging?
Yes. Your logo, packaging design, inserts, instructions and labels are applied and verified during assembly. We work from your artwork files or can coordinate with a packaging supplier; the finished product ships under your brand with your labeling and documentation.
7. What functional testing can you perform?
Electrical continuity and function, mechanical operation and torque, leak tests, fit and alignment checks, and operational testing per your specification. Test benches with fixtures are built to your requirements (2-4 weeks for custom setups), and results are recorded per unit or per sampling plan as agreed.
8. How is assembly quality traced if there is a problem later?
To whatever level you need: serial numbers, lot numbers or batch records linking finished units to component lots, torque values, test results and operator records. Retained samples from every batch support dispute resolution. For recall-critical programs we implement full serial traceability.
9. Can you assemble electronics, not just mechanical parts?
Simple electrical assembly yes: wire harnesses, connectors, switches, sensors and PCBs mounted into enclosures, with ESD-safe handling. Full PCBA (populated circuit boards) is quoted case by case – we will tell you honestly when it is outside our scope and refer you to the right process.
10. What lead times should I plan for?
With components available, assembly runs 5-10 business days per batch including packing. Setup for new programs (fixtures, test benches, packing lines) takes 1-4 weeks depending on complexity. Component production runs in parallel where we supply the parts, so total program lead time is often set by the longest component, not the assembly itself.
11. How is assembly priced?
Assembly price = setup (fixtures, test benches, packing lines – amortized across volume) + per-unit labor (standard minutes per operation) + testing + packaging materials + incoming inspection. Component costs are quoted separately when we supply them. You receive an itemized quote within 24 hours, and design-for-assembly feedback often cuts per-unit labor on the next revision.
12. Can you reverse-engineer an assembly from a sample?
Yes. Send a sample; we disassemble, document components and fasteners, draft assembly drawings and a BOM, then re-assemble with improvements flagged (better orientation cues, fewer fasteners, improved testability). This is a common path for spare parts, legacy products and competitive teardowns.
13. Can I supply my own parts, or do you buy everything?
Both models work. Consignment: you supply the components, we supply labor, fixtures, process and quality control – fastest start if your suppliers are already approved. Turnkey: we buy every line on the parts list, kit it, build and pack – better if you want to cut the number of suppliers touching your product. Many customers start consignment on the first program and move to turnkey once trust and process are established. What matters is naming component ownership, packaging supply and replenishment responsibility in the scope before the first run.
14. How do volumes and design changes affect unit price?
Per finished unit, built from three components: labor time per unit (driven by touches and work content), fixtures and tooling amortized across the order, and parts cost if the program is turnkey. Higher volumes lower per-unit price because setup is shared. Design-for-assembly changes made before tooling typically remove 15-30% of unit cost – which is why we review your drawings and work instructions before quoting rather than after. Ask us to price the same specification side by side; a cheap labor line with oversized packaging can cost more landed.
15. How do you control quality during assembly?
Through process discipline rather than end-of-line heroics: versioned work instructions at each station, physical separation of variants, component consumption reconciliation against the BOM, quarantine of defects, and in-process checks at defined intervals. Finished inspection verifies kit completeness, correct variant, appearance, seals, labels, barcode readability and packed weight. A pilot batch before full release measures actual labor time, packaging consumption and breakage – so the quotation and instructions meet reality before volume, not after.
16. What should I prepare before starting an assembly program?
Bring five things to the first discussion: current work instructions, product dimensions and weight, packaging requirements, annual usage, and expected order cadence. Add known material dependencies and the person authorized to approve instruction changes – clear ownership prevents decisions stalling between departments. If custom printed materials are involved, the packaging artwork approval completes before mass printing. If you are missing some of these, we can help build them; the pilot batch exists precisely to convert assumptions into measured data.