Custom Plastic Terminal Blocks Through CNC Machining
We machine plastic terminal blocks to customer drawings for electrical, automation, and fluid-handling equipment. Parts are produced from engineering plastics with controlled dimensions, thread accuracy, and surface finish suitable for repeated assembly and electrical isolation.
- Linear Tolerance
- ±0.05 mm
- Prototype Lead Time
- 12 days
- Axes Available
- 5-axis
- Polymers Supported
- 8+
Material Options for Terminal Block Components
Plastic terminal blocks require stable dimensions under load and exposure to chemicals or moderate heat. Material selection starts from the application details supplied with each RFQ.
Filled grades add wear resistance or flame retardancy where the application demands it.
CNC Processes Applied to Terminal Blocks
Terminal blocks are produced on 3-axis and 5-axis mills and CNC lathes. Threaded inserts or mounting holes are added in the same setup when geometry allows.
Primary Machining
- Face milling
- Slotting
- Drilling
Feature Forming
- Tapping
- Counterboring
- Chamfering
- Threaded inserts and mounting holes in-setup
Secondary Finishing
- Deburring
- Light polishing where specified
Tolerances and Inspection Standards
We hold linear tolerances to ±0.05 mm on most features and tighter on critical mounting or terminal surfaces when required.
Inspection available: Thread gauging, CMM reports, and first-article inspection. Customers receive inspection data with each shipment.
Typical Project Types
- Replacement blocks for legacy machinery where molded parts are no longer available
- Low-volume runs for new equipment before tooling investment
- Modified standard designs that need added mounting flanges or altered terminal spacing
- Parts in high-performance polymers for semiconductor or chemical-processing environments
Design Features We Machine Regularly
Every geometry is machined to drawing, with features integrated into a single setup where the design allows.
Multiple terminal cavities
Machined with precise pitch for consistent terminal alignment.
Integrated mounting ears
Combined with slotted holes for flexible panel fit-up.
Through-holes
For wiring or grounding paths.
DIN-rail and panel slots
Slots for DIN-rail clips or panel fasteners.
Traceability engraving
Text or part-number engraving for full traceability.
Lead Time and Production Volumes
Prototypes
1–50 pieces completed in 7–12 working days after order confirmation.
Repeat Orders
50–500 pieces follow the same process with updated scheduling.
Larger Volumes
Quoted on a case-by-case basis.
Quality Documentation and Packaging
- Material certificates when requested
- Dimensional reports and packing lists
- Partitioned cartons or foam inserts to prevent damage during export transit
- Custom labeling and barcoding supported
Request a Quote for Plastic Terminal Blocks
Send 2D drawings or 3D models, material preference, quantity, and any tolerance or finish notes to info@plasticcncpro.com. We review manufacturability and return a firm quotation with lead time.
Our address for sample shipments is 29 Fuxing Road, Dongguan City, Guangdong Province, China.