Drawing & Sample Based Customization Solutions for Precision Replication, Reverse Engineering & Production-Ready Hardware
Precision Manufacturing From Technical Drawings, Reverse Engineering From Samples, Exact 1:1 Replication For Custom Bag & Luggage Fittings
Start With the Engineering Information You Already Have
You do not need the same project input at every development stage. Junhao supports both complete technical documentation and physical-reference-based development.
Explore OEM & ODM CooperationAt Junhao Hardware, we support two flexible customization input modes to match your available resources: drawing-based manufacturing for clients with complete technical files, and sample-based reverse engineering for clients who only have physical parts or reference samples.
Best when dimensions, materials, tolerances and design details are already defined in technical files or engineering documentation.
Best when the project starts from an existing physical part, legacy component, prototype or reference sample that must be converted into production data.
With 19+ years of specialized handbag and luggage hardware manufacturing experience, advanced precision measuring equipment and professional engineering teams, we can turn your design files or physical samples into production-ready metal hardware with exact dimensional accuracy, matching surface finish and consistent functional performance.
Whether you have formal CAD drawings, rough hand sketches or original hardware samples, we deliver precise, on-spec custom production with strict quality control and full confidentiality. All custom projects are protected under non-disclosure agreements.
Drawing-Based or Sample-Based — Both Lead to Production-Ready Hardware
The choice depends on what you can provide today. A complete CAD package gives engineering a defined specification; a physical sample gives engineering the geometry, material, surface and functional reference to reconstruct.
I Have Technical Files
Choose this route when the part is already defined through technical drawings, CAD models, specifications or dimensioned sketches.
I Have a Physical Sample
Choose this route when technical files are unavailable and the physical part itself must become the engineering reference.
From Available Reference to Controlled Manufacturing Data
The service is built around flexible inputs, dimensional reconstruction, finish matching, rapid sample verification and DFM support so the project can progress even when documentation is incomplete.
Dual Input Mode Flexibility
Accept both formal technical drawings and physical sample parts. Choose the input method that works best for your project stage and available resources.
Precision Dimensional Accuracy
Equipped with professional calipers, coordinate measuring machines and 3D scanners. We control tight dimensional tolerances and ensure 1:1 replication of every detail.
Professional Reverse Engineering Capability
Convert physical samples into complete 3D models and production-ready technical drawings. Replicate legacy parts, discontinued hardware or competitor reference samples accurately.
Exact Material & Finish Matching
Match not only shape and size, but also base material composition, surface finish, color tone, texture and functional performance to your reference exactly.
Fast Prototyping & Quick Verification
Efficient sample development workflow delivers first article samples quickly. Verify fit, appearance and function before committing to full mass production.
Design Optimization Support
Provide professional DFM (Design for Manufacturability) analysis and optimization suggestions to improve production efficiency, reduce cost and enhance quality.
What You Send, What Engineering Does, and What You Receive
Each route uses different source information but converges on the same objective: an approved, production-ready hardware specification.
Drawing-Based Custom Manufacturing
Produce hardware exactly according to your technical design documents.
What We Accept
- 2D technical drawings with dimension annotations (PDF, DWG format)
- 3D solid models (STEP, IGES, STP, STL format)
- Detailed specification sheets with material, finish and tolerance requirements
- Rough design sketches with key dimensions (for development projects)
What We Deliver
- Manufacturing exactly to specified dimensions and tolerances
- Strict compliance with material and finish specifications
- DFM feasibility review and optimization suggestions
- First article sample approval before mass production
Ideal For
- Brands and factories with complete engineering departments
- Mature product designs with formal technical documentation
- New product development with finalized design files
- Projects requiring precise dimensional control for assembly
Sample-Based Customization & Reverse Engineering
Replicate or develop hardware based on your physical sample parts.
What We Accept
- Original hardware samples, reference parts or competitor products
- Legacy or discontinued hardware items needing replication
- Prototype samples or handmade craft pieces
- Partial samples with key design features
What We Deliver
- 1:1 dimensional replication of your sample
- Reverse engineered 3D models and production drawings
- Exact matching of material, finish, color and function
- Optional design improvement and structure optimization
Ideal For
- Clients without formal technical drawings or CAD files
- Replication of existing or discontinued hardware parts
- Product development based on physical reference samples
- Small businesses and designers without engineering teams
Turn a Physical Part Into Measurable, Manufacturable Production Data
For sample-based projects, the physical part becomes the engineering reference. Measurement, 3D scanning, material identification and process evaluation convert the sample into controlled technical information before replication samples are produced.
Receive original sample, reference part, prototype or partial sample.
Measure critical dimensions using professional calipers, coordinate measuring machines and 3D scanners.
Reconstruct geometry into complete 3D models and production-ready technical drawings.
Identify material, finish, color, texture and functional characteristics for matching.
Produce replication samples and verify against the physical reference before mass production.
Two Different Starting Paths, One Controlled Production Flow
The first engineering steps differ depending on whether your input is a drawing or a physical sample. After sample confirmation, both routes converge into locked specifications, mass production, inspection and final shipment.
Drawing-Based Front End
- Technical drawing / CAD / specification submission
- DFM review, tolerance analysis and manufacturability assessment
- 3D modeling / mold development / first article sample
merge at
sample approval
Sample-Based Front End
- Physical sample / reference part submission
- Dimensional measurement, material identification and process evaluation
- 3D scan / reverse engineering / replication sample
Requirement Submission
Send your technical drawings, physical samples or design references along with quantity, material and finish requirements.
Technical Evaluation & Quotation
Provide detailed formal quotation with lead time and sample plan.
Sample Development
Develop the first physical verification part.
Sample Confirmation
Submit pre-production samples for your verification of dimensions, appearance, material, finish and function. Adjust as needed until full approval.
Mass Production Setup
Lock final specifications, prepare production tooling and set up production line parameters.
Production & Quality Inspection
Full batch production with 100% in-process inspection at every key stage.
Final Verification & Shipment
Final quality audit against approved samples, secure packaging and on-time delivery.
Match the Part in Three Layers: Dimension, Appearance and Function
A sample is not considered matched only because the outline looks similar. Dimensional tolerance, finish character and mechanical behavior all need to align with the approved reference.
Dimensional Tolerance Control
- Die cast parts: ±0.05mm standard, ±0.02mm for fine details
- Stamped parts: ±0.03mm standard
- Matching sample deviation within acceptable industry tolerance
Finish & Color Matching
- Match sample color tone, luster and texture under standard light sources
- Control batch-to-batch color difference within brand-approved tolerance
- Match surface treatment type: plating, PVD, antique, matte, etc.
Functional Performance Matching
- Replicate mechanical function: locking force, spring tension, smoothness of operation
- Match structural strength and load-bearing performance
- Same material composition and hardness as reference sample
Engineering Support for Projects With Complete or Incomplete Technical Data
The service is designed to move both engineering-led and sample-led projects into approved, repeatable manufacturing specifications.
19+ years focused exclusively on handbag and luggage hardware manufacturing
Dual mode support for both drawing and sample based projects
Advanced 3D scanning and precision measuring equipment
Experienced engineering team for reverse engineering and DFM optimization
Exact 1:1 replication of dimensions, material, finish and function
Fast sample turnaround and quick design iteration
Strict ISO 9001 quality control and full inspection
Complete confidentiality and exclusive design ownership
Questions Buyers Ask Before Sending Drawings or Physical Samples
These answers cover accepted files, reverse engineering, sample matching, tolerance, material and finish replication, prototyping, confidentiality and production transition.
01What drawing and CAD file formats do you accept?
For drawing-based projects, we accept 2D technical drawings in PDF and DWG format, 3D solid models in STEP, IGES, STP and STL format, detailed specification sheets, and rough design sketches with key dimensions.
02Can you start if we only have a physical sample and no CAD file?
Yes. Sample-based customization is specifically intended for clients without formal technical drawings or CAD files. Physical samples can be measured, scanned and reverse engineered into 3D models and production drawings.
03Can you reverse engineer legacy or discontinued hardware?
Yes. Legacy or discontinued hardware items are suitable sample-based inputs. The service includes dimensional replication, reverse engineered 3D models, production drawings and optional design or structural improvement.
04How do you measure a physical sample accurately?
Junhao uses professional calipers, coordinate measuring machines and 3D scanners to control dimensional accuracy and reconstruct sample geometry.
05What dimensional tolerances can be controlled?
Die cast parts are specified at ±0.05mm standard tolerance and ±0.02mm for fine details. Stamped parts are specified at ±0.03mm standard tolerance, with sample deviation controlled within acceptable industry tolerance.
06Can you match the material and surface finish of our sample?
Yes. The service scope covers matching base material composition, surface finish, color tone, luster, texture and function, including treatment types such as plating, PVD, antique and matte finishes.
07Can you match functional performance as well as appearance?
Yes. Functional matching includes locking force, spring tension, smoothness of operation, structural strength, load-bearing performance, material composition and hardness.
08Do you provide DFM review for drawing-based projects?
Yes. Drawing-based manufacturing includes DFM feasibility review, tolerance analysis and manufacturability assessment, with optimization suggestions to improve production efficiency, reduce cost and enhance quality.
09Will we approve a sample before mass production?
Yes. The standard process includes pre-production sample confirmation for dimensions, appearance, material, finish and function. Adjustments can be made until full approval before final specifications are locked for mass production.
10How do drawing-based and sample-based projects differ during technical evaluation?
Drawing-based projects use DFM review, tolerance analysis and manufacturability assessment. Sample-based projects use dimensional measurement, material identification and process evaluation before reverse engineering and replication sample development.
11How is our design or physical sample protected?
All custom projects are protected under non-disclosure agreements, with complete confidentiality and exclusive design ownership included in the service positioning.
12What should we send to get a free evaluation and quotation?
You can send technical drawings, physical samples or design references together with quantity, material and finish requirements. Junhao then performs technical evaluation and prepares a detailed quotation with lead time and sample plan.
Turn Your Drawings Or Samples Into Custom Hardware
Whether you have complete technical drawings or only physical samples, our team can deliver precise, high-quality custom hardware manufacturing exactly to your specifications. Send your files or samples to get a free evaluation and detailed quotation.
Choose whether your project starts from technical files or a physical sample.
Share quantity, material, finish and any tolerance or functional requirements.
Drawing projects receive DFM and tolerance review; sample projects receive measurement and reverse-engineering evaluation.
Pre-production samples are verified before final specifications are locked for production.