JinHai Logo
Contact Us
Frequently Asked Question
About JinHai
FAQ
What is the minimum order quantity?

At JinHai, we define MOQ based on different harness types. Below are JinHai’s internal minimum order quantities:

  1. Simple harnesses (consumer electronics or small appliance internal harnesses)
    • MOQ: 500–2000 pieces;
  1. Moderately complex harnesses (industrial harnesses, agricultural machinery harnesses, low-voltage automotive harnesses)
    • MOQ: 1,000–5,000 pieces;
  1. Highly Complex Harnesses (e.g., engine harnesses, chassis harnesses, instrument panel harnesses)
    • MOQ: 5,000+ pieces
  1. Fully Customized Harnesses
    • JinHai determines MOQ based on complexity and cost considerations: 2,000–5,000 pieces;

Certainly. JinHai can provide you with 1-5 samples.

Is there a charge for samples?JinHai offers two options for your consideration.

  1. Simple, low-value samples: If you express strong intent to collaborate with JinHai (typically by providing detailed drawings, clear quantity requirements, and a delivery schedule), we charge 50% of the standard sample price. We commit to deducting this sample cost from the bulk order payment upon subsequent order placement.
  2. Complex, high-value samples: For products involving hundreds of circuits, specialized connectors, or expensive shielding layers, we charge standard sample fees. However, we commit to refunding the sample cost if your subsequent order exceeds 10 times the sample value.

Sample Lead Time

  • Upon receiving your sample request, JinHai will complete sample production within 1-3 weeks and ship it to your location via international express delivery.

At JinHai, we only support three payment methods:

  1. FOB + 100% advance T/T
  2. OB + Deposit (30%-50%) + Balance (70%-50%) upon receipt of copy of B/L via T/T
  3. FOB + Letter of Credit (L/C)

Regarding order cycles, JinHai will clearly communicate order quantities and determine lead times based on order volume. Below are JinHai’s typical lead times for different order quantities:

  1. Small-batch custom orders (100–500 pieces): Due to lower volumes and the need to procure many raw materials on a spot basis, pre-production preparation takes longer. Lead times typically range from 2 to 5 weeks.
  2. Large-volume custom orders (over 1,000 units): Due to the large order quantity and significant raw material requirements, some materials are sourced from distributors. This may necessitate adjusting allocation ratios or require factory time for verification. Therefore, the typical production cycle ranges from 8 to 20 weeks. Additionally, the cycle may extend due to special circumstances (e.g., shipping weather conditions, tariff fluctuations).

Regarding bulk order discounts, JinHai offers multiple discount options for your selection:

  1. Direct Price Discount: We provide tiered pricing based on order quantity (e.g., 1K, 5K, 10K, 50K). Unit prices decrease with order volume, offering the most transparent pricing feedback.
  2. Free Product Allocation: We provide complimentary products based on order quantity. For example, with a 10K order, we include 10 free units as spares.
  3. Logistics Support: For orders exceeding 5K units, we may cover 20% of local transportation costs (to Chinese customs).
  4. Engineering Support: While ensuring product performance and reliability, we may utilize more cost-effective materials or implement minor design adjustments, sharing the resulting cost savings with you.

We need specific information, such as material, size, thickness, and quantity. Ideally, you can provide drawings. For simple products, sketches are also acceptable.

Do you support customized designs?

Yes, we offer full-process customized design services, but require clients to provide clear technical input documents to ensure precise alignment with requirements. Below are the specific requirements and collaboration process:

  • Required Input Documents:
    1. Electrical Schematic: Specify wire gauge, connector models, fuse/relay locations, etc.;
    2. 2D Layout Diagram: Specify branch dimensions, cable tie attachment points, protective material specifications, and shielding requirements;
    3. Application Environment Parameters: Indicate operating temperature range, vibration conditions, waterproof rating, and EMC requirements;
  • Customization Service Process:
    1. Our company requires 1-3 business days to confirm the harness’s operating environment, application scenarios, and special requirements;
    2. After providing 3D simulation drawings and 2D flat patterns, our company requires 5-10 business days for design verification. We can assist with initial revisions and iterations (up to 3 free rounds).
    3. Sample Production: After design verification, we require 7-15 business days for raw material procurement and sample fabrication. Sample quantity: 1-3 pieces (prototyping fees apply upfront, but can be offset against bulk production costs). Samples shipped with harness appearance and continuity test reports.
    4. Batch Delivery Cycle: Small batches (>100 pieces) require 15-20 days. Large batches (>1000 pieces) require 30-45 days (partial shipments possible).
  • Important Notes
    1. Drawings require final customer confirmation and signed return for our records;
    2. Design changes after mass production may incur fees based on the number of change points and complexity;
    3. We offer cost optimization solutions, e.g., replacing PTFE with XLPE reduces costs by 40%.

JinHai’s most competitive areas:

  1. Automotive connectors (terminal connectors like JST, TE, MOLEX, etc.; high-voltage connectors; high-speed data connectors; RF connectors)
  2. Consumer electronics connectors (board-to-board connectors; wire-to-board connectors; FPC/FFC connectors; I/O connectors; battery connectors)
  3. Industrial connectors (circular connectors M series, rectangular connectors Harting Han series, aviation connectors, and terminal blocks)
  4. Communication and data center connectors (RJ45 connectors, fiber optic connectors, and backplane connectors)
  5. Medical device connectors (LEMO circular connectors and various custom connectors)
Logistics Methods

JinHai offers multiple logistics options:

  1. International Express Delivery: Ideal for sample shipments. Couriers assist with customs clearance. JinHai currently partners with DHL, TNT, and EMS.
  2. International Air Freight: Suitable for small-batch product deliveries. Offers faster transit times than sea or rail freight with high security.
  3. International Sea Freight: The most prevalent shipping method in international trade, suitable for bulk order shipments with flexible containerization options.
  4. International Rail Transport: Also suitable for bulk order shipments, primarily serving the China-Europe corridor.
  1. Moisture Prevention Measures: At JinHai, wiring harnesses are packaged in cardboard boxes.
    • Internal Moisture Protection: Two methods are used—PE bags or aluminum foil bags (specific method determined by customer specification or provision)—with three desiccant packets per box for additional moisture control.
    • External Moisture Protection: After final packaging, products are placed on pallets for shipment. Prior to dispatch, goods on pallets receive secondary protection with stretch wrap.
  2. Shock Absorption Solutions:During transit, wiring harnesses experience vibrations and jostling. To prevent damage to critical connectors, JinHai offers enhanced shock absorption solutions:
    • Wrapping entire harnesses in bubble wrap for protection;
    • Using custom-shaped EVA foam to wrap harnesses or as padding/separators;
    • Employ custom-molded foam liners specifically designed for high-value wiring harnesses.

All packaging methods listed above are provided by JinHai. Should customers specify alternative packaging requirements, we will strictly adhere to those instructions.

How to Handle Quality Issues or Returns

At JinHai, if shipped goods develop quality issues, we generally handle them through the following three approaches:

  1. If the product is irreparable, JinHai will directly reship a replacement to the customer;
  2. If the product is repairable, JinHai will coordinate with the customer to arrange for a third-party service provider approved by the customer to handle the repair, with all associated costs borne by JinHai;
  3. For standard orders, JinHai will provide complimentary products equivalent to 0.1% of the order value for future maintenance or replacement purposes.
  • Incoming Material Inspection
    • Wires and terminals are sampled and tested based on the supplier’s shipping report to verify wire strand count, wire diameter, color, terminal plating thickness, and dimensions. Connectors are sampled and tested for dimensional compliance against official drawings.
  • Process Inspection
    • Wire Cutting/Crimping Process: Initial, patrol, and final inspections are conducted per CP requirements. Patrol inspections occur at a frequency of 2 hours per shift.
    • Pre-assembly Process: Insertion follows the “insert, listen twice, pull back” procedure.
    • Assembly Process: First, verify seal installation. Second, confirm secondary locking of connectors and primary locking of terminals.
  • Final Inspection
    • Inspectors conduct 100% dimensional checks of harnesses using tape measures/steel rulers;
    • Perform 100% electrical functionality testing on finished harnesses using dedicated harness electrical test benches;
    • Quality inspectors conduct final checks on harness appearance, material integrity (clips/tie wraps), label content, and clarity;
    • The Quality Department periodically samples from qualified products for more stringent full-dimension measurements and functional testing to ensure production process stability;
  • Traceability Assurance
    • Each harness is assigned a unique label serial number, traceable through the labeling system. This enables rapid identification of the source and isolation of problematic products in the event of an issue.
Can we visit your factory?

Of course, we welcome you to visit our factory at any time. Please email or call us to let us know if you have a trip planned.

We offer custom services, and most products are made according to customer drawings and samples, so we can’t provide a complete catalog and price list. If needed, we can offer some standard products and prices for your reference. If you have drawings or samples, we can quickly provide a quote.

For standard products, we ship within 1-3 business days after receiving the payment. For products that need mold, the production cycle may take 1-3 weeks. Send us your requirements, drawings, or samples, and we will provide a free quote and delivery time quickly.

We strictly control the quality of raw materials, the production process, and pre-shipment inspections to ensure you receive high-quality products.

Yes, we can handle urgent orders. Our average turnaround time is 2-3 weeks. Our average turnaround time is 2-3 weeks, and if your project is on a tight schedule, we expedite production for you.

Yes, we are happy to provide samples. For standard products, we offer free samples, and we hope you can pay for the shipping. For custom products, we hope you can cover the sample cost and shipping. These costs will be deducted from your official order.

Determined by the material procurement cycle. Samples for commonly used materials are produced within 3-7 days. For special materials, sample delivery times are communicated based on the procurement cycle.

Yes, we mainly customize products based on customer drawings and samples.

Yes, we can add marks or brand logos through stamping, laser marking, or screen printing.

Due to confidentiality agreements with many clients, we cannot display many of the products we have made on our website. Our full range of equipment can produce any sheet metal and stamping products. Please fill out the form and submit it or send an email. You may be surprised!

If you don’t have drawings, just photos or product parameters, we can provide detailed drawings for your confirmation before production.

Please let us know what certifications you need, and we will apply for them according to your requirements.

We mainly accept TT and L/C. For sample orders or small orders, we also support PAYPAL.

We support EXW, FOB, DDP, CIF, FCA, CIP, DAT, DAP, and more.

Of course. We are very good at shipping goods to clients’ specified locations using DDP terms. We handle all the shipping, taxes, and customs clearance.

Prototyping and Product Development:

  • Dedicated cutting-edge equipment
  • The entire operation is managed by experienced project engineers and managers
  • Customers participate in product design during the product development cycle, and prototype design is completed quickly
  • Assist our clients’ design teams as a resource
  • Improve production efficiency while maintaining aesthetics and functionality

Cost reduction process

  • Cost reduction in the production process
  • Competitive price

Inventory Management

  • Inventory levels are calculated based on customer forecasts
  • Customer’s delivery requirements
  • Internal capacity level

 

JinHai estimators and project managers analyze customer drawings and specifications to ensure that all product requirements are met.

The front end uses controlled procedures, routings, and inspection plans to generate the documentation and instructions required to transfer customer requirements to the manufacturing process.

Then, using specified procedures and inspections, our skilled production and inspection teams execute the defined process flow to strictly adhere to and meet customer requirements.

  • Oversee the entire design and development process of the product.
  • Integrate product into full production.
  • Optimize design for ease of manufacturing and assembly.
  • Create and improve prototypes based on client’s existing designs.
  • Create and modify prototypes based on client’s existing designs.

 

Wire harness manufacturing is an essential component used in the automotive, motorcycle, agricultural and home electronics sectors.

Wire harness manufacturing is a series of manufacturing technologies that use fully automated manufacturing methods to transform all wire harness raw materials into functional products.

In addition, the crimping process is quite tricky and requires professional skills.

JinHai first completes the final product by manufacturing a variety of raw materials through specialized equipment and assembling by professionals;

JinHai uses different technologies in the wire harness manufacturing process, including fully automatic crimping, pre-assembly, assembly and special equipment testing.

Fully automatic crimping

Fully automatic crimping is the process of crimping the wire and the terminal together. This process is the most core and important process in the entire wire harness manufacturing process.

JinHai manufacturers prefer to use fully automatic crimping equipment, which is fast, convenient and effective.

For terminal crimping, JinHai uses different methods, especially:

  • Fully automatic crimping
  • Semi-automatic crimping
  • Semi-automatic articulation
  • Fully automatic articulation

Pre-Assembly

Pre-assembly is another technique we use when manufacturing wire harnesses. During this process, connectors and terminals can be installed in advance to prepare for subsequent tooling board manufacturing.

JinHai uses professional quality control technology during the pre-assembly process, such as:

  • Grid-based placement of wires with different wire diameters
  • Multiple connectors are placed in grids
  • The plug-in process adopts the process of “one plug, two listen, three pull”

Assembly

Assembly is the key in overall manufacturing technology.

It is the final process of bringing all the harness parts together and positioning and securing them into the finished or manufactured product.

  • Wiring of tooling board
  • Fixing with cable ties on tooling board

Special equipment testing

Special equipment testing is the most necessary process in the entire wire harness manufacturing process.

This process is achieved by using special equipment with anti-terminal pin withdrawal to check whether the wire connection sequence of the wiring harness product is correct.

It can accurately identify whether the plug-in sequence of the wires in the wiring harness is correct and whether the male terminals are plugged in place.

 

Here are some of the most common materials used in custom wire harness manufacturing:

  • Terminals (welding process/copper tin plating/copper nickel plating/copper gold plating/copper silver plating, etc.)
  • Connectors (PA66/PA6/PBT, etc.)
  • Wire (0.75 mm2/1.0 mm2/1.25 mm2/1.5 mm2/2.0 mm2, etc.)
  • Cable ties (PA66/PA6, etc.)
  • Adhesive tape (PVC/BOPP/PET/PE/PP, etc.)
  • Waterproof plug (silicone/EPDM/fluororubber, etc.)

Our manufacturing facility can also process other types of wire harnesses.

 

JinHai uses different machines for wire harness processing. These machines are divided into:

  • Fully automatic crimping equipment
  • Fully automatic assembly equipment
  • C-type winding machine
  • Mobile tooling board
  • Special electrical test bench

 

The process allows the wire to be delivered to the equipment through a wire feeding device, and the terminal and the wire are connected together by crimping. During this process, the crimping status is monitored in real time by a pressure monitoring device to ensure that each product achieves stable quality. .

Fully automatic crimping replaces traditional manual crimping, which is faster, more efficient and more accurate. During the fully automatic crimping process, the automation equipment cooperates with the pressure monitoring device to monitor the crimping status in real time.

In addition, due to these and other advantages, fully automatic crimping technology is suitable for a wide range of crimping applications.

  • Fast and effective.
  • It reduces the risk of insufficient tension and crimp height deviation in manual crimping.
  • The crimping process is more stable.
  • Each wire is crimped sufficiently to exceed the crimping condition of a hand crimp.
  • High cost performance.

Our experienced inspection team starts with the inspection process.

The factory operators verify the product against the prescribed operation documents and inspection documents before commencing operations.

Once the factory operators have manufactured the product to specifications, the product is taken to the inspection area where professional quality department inspectors check whether the product is acceptable.

Here are some benefits of wire harness manufacturing:

  • Harness is a broad term that covers a wide variety of materials.
  • Wiring harnesses offer a wide range of design possibilities.
  • It allows for more customizable settings.
  • The manufacturing process of wire harness is very demanding, which makes the wire harness products have higher quality.
  • The harness is easy to transport, process and install due to its light weight and flexible features.
  • It is low cost, high quality, light weight, more flexible and cost effective.
  • Wire harness manufacturing can be widely used in various industries.

 

JinHai is a professional wire harness manufacturer in China. We use innovative technology to provide customers with a service that integrates product design, engineering design, rapid prototyping and production services.

  • Provide trustworthy ODM and OEM services with customizable size and style options.
  • Wire harnesses are widely used in automobiles, energy, home appliances, agricultural machinery, medical, dental and other fields.
  • A high-tech enterprise that has obtained certifications such as environmental management system and quality management system.

 

JinHai Logo

If you need to custom wiring harness for your product, JinHai is your first choice. Send us your detailed requirement and get an instant quote now.

Custom Wire Harness
Automotive Wiring Harness
Motorcycle Wiring Harness
Agricultural Machinery Wiring Harness
Smart Home Wiring Harness
Resources
About Us
FAQ
Wiring Harness Quality
Blog
Sitemap
Contact Us

+86 18201157907

+86 15133626417

sales@jinhaitrd.com

Room 1626, 4th Floor, Building 13, Xiuyuan, Dachengli, Fengtai District, Beijing, China

[gtranslate widget_look="flags" rel="nofollow"]
Copyright © 2025, JinHai. All Rights Reserved.

Send Your Inquiry Today

This field is required.
This field is required.
This field is required.
WhatsApp Call me Email Us Contact Us