Ningbo Chaoxu Plastic Products Co., Ltd. undertakes mold development and precision injection molding services for terminal blocks, connectors, and plastic base housings, supporting drawing-based mold making and sample-based reverse engineering. We integrate plastic mold R&D, engineering plastic injection molding, and supporting post-processing into one service, targeting industrial control, instrumentation, and power control board industries, offering one-stop supporting services of product DFM evaluation, mold manufacturing, and batch injection molding.

      This product is a PCB plug-in terminal block plastic housing, available in multiple pole counts and colors including green, blue, black, etc. The housing has internal mounting positions reserved for metal spring clips and screws, with precise snap-fit structures and excellent insulation performance. The wall thickness is uniform, and the positioning posts, snap fits, and partition slots are manufactured with high dimensional accuracy, ensuring smooth insertion/withdrawal and stable locking, meeting high-current electrical insulation requirements. It is widely used for wiring connections in PLCs, frequency inverters, switching power supplies, and industrial control circuit boards. Mold design, trial molding, and mass production can be carried out based on customer 3D drawings or physical samples.

      The factory is located in Mould City, Fanshi, Longshan, Cixi, Ningbo, covering an area of 2,000 square meters, with independent mold workshop and injection molding workshop. The mold workshop is equipped with a full set of processing equipment including CNC machining centers, high-speed engraving and milling machines, EDM machines, and grinders. The injection molding workshop is equipped with Haitian injection molding machines with servo robotic arms, excelling in stable mass production of precision electrical insulating plastic parts.

Product Processing Advantages

      1. Integrated mold opening and injection molding — product structure evaluation, mold processing, trial molding and mold correction, and injection molding production are all completed in-house, reducing outsourced processes and facilitating control over delivery time and product consistency.

      2. Early-stage DFM manufacturability analysis — risk prediction for small dividing bars, snap fits, and pin positioning slots; optimization of gating and venting solutions to prevent short shots, deformation, and sink marks, ensuring dimensional accuracy of terminal slots.

      3. Engineering plastics available — flame-retardant PA66 nylon is the mainstream choice; PC and PBT are also available. Flame-retardant grades meet standards, with excellent insulation, high temperature resistance, and resistance to deformation, meeting electrical safety requirements. Custom colors are available.

      4. Precision mold processing — multi-cavity mold design improves production efficiency; fine ribs and snap-fit structures are properly polished to ensure smooth assembly without sticking.

      5. Complete quality control system — first article confirmation, in-process patrol inspection, sampling inspection of slot spacing and snap-fit dimensions; production batch traceability, meeting quality control requirements for industrial control electrical products.

      6. Supporting post-processing — burr trimming, appearance sorting, packaging and shipping, reducing customer secondary processing workload.

Applicable Processing Categories

      Injection molding of PCB terminal block plastic housings

      Custom mold making for plug-in connector terminal plastic housings

      Insulating bases for industrial controller terminal strips

      Flame-retardant PBT/PA66 electrical plastic parts

      Multi-pole terminal block plastic parts

      Customization of various electrical connector insulating plastic housings

      Other electrical insulating plastic parts — mold feasibility can be evaluated upon providing drawings or samples.

Common Material Descriptions

      Flame-retardant PA66 nylon: high flame retardancy, high temperature resistance, good rigidity, excellent insulation performance, the most commonly used material for terminal blocks.

      PBT: excellent dimensional stability, high temperature resistance, low molding shrinkage, suitable for high-precision terminal housings.

      PC: strong impact resistance, transparent grade available, suitable for terminal housings with transparent inspection windows.

      Material selection is determined comprehensively based on product flame-retardant grade, temperature resistance, insulation requirements, and cost. Engineers provide material selection recommendations.

Processing Workflow

      Customer provides 3D drawings / physical samples → DFM product structure evaluation → Output solution quotation, confirmed by both parties → Mold structure design → Mold CNC/EDM processing, polishing and fitting → T1 trial molding → Samples sent to customer for confirmation → Mold modification per feedback → Batch injection molding after sample approval → Product inspection → Packaging and delivery → After-sales follow-up.

      During the requirement evaluation stage, customers provide drawings or physical samples, specify material, flame-retardant grade, dimensional tolerances, and annual output requirements — quotation solution output within 1–2 working days.

      Mold design focuses on small dividing ribs, snap fits, and positioning slot structures, optimizing venting to solve filling difficulties of thin-wall fine structures.

      Trial molding tests appearance, dimensional accuracy, and metal terminal assembly fit; mass production starts after customer confirmation.

Quality Control

      Raw materials are checked for grade upon incoming inspection; material reports and flame-retardant certificates are available for flame-retardant engineering plastics.

      Dimension verification at each mold processing stage, with focus on key tolerances of slot spacing, snap fits, and mounting holes.

      Injection molding production implements first article inspection, scheduled in-process patrol inspections, sampling assembly of metal terminals for insertion/withdrawal performance testing, and monitoring defects such as deformation, short shots, and flash.

      Finished products undergo key inspection of appearance and dimensional accuracy; defective products are sorted and quarantined.

      Production records document machine and raw material batches for full traceability.

Factory Basic Information

      Factory covers about 2,000 square meters, divided into independent mold, injection molding, and assembly workshops.

      Mold workshop has over ten sets of complete processing equipment including CNC machining centers, high-speed engraving and milling machines, EDM machines, and grinders.

      Injection molding equipment consists of Haitian injection molding machines with servo robotic arms and production monitoring systems, excelling in precision flame-retardant electrical plastic part production.

      Core engineers have 25 years of plastic molding experience and 15 years of automotive parts quality control experience, with OEM supporting service experience.

      Factory is located in Mould City, Fanshi, Longshan, Cixi, Ningbo, near National Highway 329, with convenient logistics and transportation.

Cooperation Steps

      1. Consultation & contact: Provide 3D drawings or physical samples, specify annual output, material, flame retardancy, and tolerance requirements; response within 1 working day.

      2. Solution evaluation: Engineers complete product evaluation and output mold and injection molding product quotation within 1–2 working days.

      3. Quotation confirmation: Confirm mold steel, plastic material, delivery time, and cooperation terms.

      4. Mold development: Complete structural design, processing, assembly, trial molding, and mold correction; cycle time depends on product complexity.

      5. Sample confirmation: Send trial samples; customer verifies dimensions and terminal assembly performance, completing mold acceptance.

      6. Batch production: Carry out injection molding production per order, deliver after inspection and packaging.

FAQ

Q: Can molds be made with only terminal block samples but no drawings?

A: Yes, we support sample-based reverse engineering to generate 3D models before mold development.

Q: Can the terminal housing be made in multiple colors?

A: Yes, PA66 and PBT raw materials can be color-matched, including green, blue, black, and transparent.

Q: Can the material meet flame-retardant safety regulations?

A: Flame-retardant grade raw materials can be selected, and corresponding flame-retardant material reports can be provided.

Q: Does terminal block plastic injection molding support small-batch trial production?

A: After mold acceptance, we support everything from small trial orders to large batch orders.

Q: Are samples provided for confirmation before mass production?

A: Yes, samples are provided after trial molding. Mass production starts only after customer verifies dimensions and assembly performance.

Contact Information

      Company name: Ningbo Chaoxu Plastic Products Co., Ltd.

      Factory address: No. 5, Fanshi Weisan Road, Longshan Town, Cixi City, Ningbo City, Zhejiang Province

      Business: terminal block connector plastic housing injection molding, flame-retardant electrical plastic mold customization, precision injection molds, sample/drawing-based customization

      1688 store: https://chaoxusuliao.1688.com