Terminal Block Pitch Explained: 5.0mm, 7.62mm, 10mm and More | SafetyPass
Terminal Block Pitch Explained: 5.0mm, 7.62mm, 10mm and More
By the Antong Engineering Team · Reviewed August 2026 · 9 min read
Selecting the right terminal block pitch requires more than matching a familiar catalog name. Products in the same category can differ in current path, conductor interface, material, dimensions, mounting and approval conditions.
For PCB designers and engineers, that distinction affects initial design, purchasing, assembly and later maintenance. This guide follows the original brief from construction through ratings, applications and practical checks so the same evidence can support the RFQ, sample approval and inspection record.
From more than 35 years of manufacturing terminal blocks, the consistent lesson is that reliability comes from matching the complete application rather than one attractive number. A 0.08 mm difference between 5.00 mm and 5.08 mm becomes 0.80 mm across ten pitch intervals.
Quick answer: Terminal block pitch is the center-to-center distance between adjacent poles. It controls PCB footprint and connection density and influences the space available for current bars and insulation; 5.0 mm and 5.08 mm are different dimensions, and the mismatch accumulates across multiple poles.
In this guide
What Is Terminal Block Pitch?
Terminal block pitch is the center-to-center distance between adjacent poles. A useful definition also identifies the boundary of the category, separating Terminal Block Pitch from similar-looking connection or mounting systems.
Definition: center-to-center distance between adjacent poles
The datasheet or drawing should identify definition and state center-to-center distance between adjacent poles. Verify the dimensional drawing against the board or mating layout. Small pitch or orientation differences accumulate across poles and can stress pins, solder joints or housings even when a short sample appears to fit. Confirm the result on a production-representative sample before releasing tooling or volume orders.
Why pitch matters for PCB layout and panel spacing
Verify the dimensional drawing against the board or mating layout. Small pitch or orientation differences accumulate across poles and can stress pins, solder joints or housings even when a short sample appears to fit. Do not copy the value from a neighboring series unless the manufacturer documents the same construction and approval.
Standard Pitch Sizes
The decisions under standard pitch sizes affect first-time assembly and long-term maintenance. Document them in the bill of materials and installation instructions instead of leaving them to operator judgment.
2.54mm, 3.5mm, 3.81mm, 5.0mm, 5.08mm, 7.5mm, 7.62mm, 10mm, 13mm
Treat the stated millimeter value as one nominal dimension or conductor class; verify the complete tolerance and profile drawing. State the requirement in terms that engineering, purchasing and inspection can all verify. If the catalog does not provide the needed value, request a drawing or test record before approval. Pitch creates geometric space, but creepage, clearance and current remain completed-product ratings.
Typical applications for each pitch (original table)
The application is a starting condition, not a rating. Translate it into current, voltage, temperature, vibration, enclosure, servicing and certification requirements before choosing a product family. Confirm the result on a production-representative sample before releasing tooling or volume orders.
Terminal Block Pitch Reference
| Pitch | Grid origin | Typical design use |
|---|---|---|
| 2.54 mm | 0.1 in | Compact board-level signals |
| 3.5 / 3.81 mm | Metric / 0.15 in | Compact control I/O |
| 5.0 / 5.08 mm | Metric / 0.2 in | General PCB field wiring |
| 7.5 / 7.62 mm | Metric / 0.3 in | Wider-spacing power circuits |
| 10 / 10.16 mm | Metric / 0.4 in | Larger conductors and spacing |
| 13 mm class | Product-specific | Heavy-duty terminal geometries |
Pitch is a dimension, not a current or voltage guarantee.
Pitch and Current Rating Relationship
Evaluating pitch and current rating relationship requires both product data and installed conditions. Keep each catalog value paired with the exact model, conductor, mounting and approval to which it applies.
How larger pitch enables higher current and creepage
Voltage performance depends on insulation geometry and installation conditions as well as nominal system voltage. Record pollution degree, overvoltage conditions and material data, then use the completed product's rating. Record the accepted condition in the terminal schedule so installers and inspectors use the same basis.
Pollution degree and CTI requirements
Voltage performance depends on insulation geometry and installation conditions as well as nominal system voltage. Record pollution degree, overvoltage conditions and material data, then use the completed product's rating. A 0.08 mm difference between 5.00 mm and 5.08 mm becomes 0.80 mm across ten pitch intervals.
Pitch and PCB Footprint Design
Evaluating pitch and pcb footprint design requires both product data and installed conditions. Keep each catalog value paired with the exact model, conductor, mounting and approval to which it applies.
Matching pitch to PCB pads
Verify the dimensional drawing against the board or mating layout. Small pitch or orientation differences accumulate across poles and can stress pins, solder joints or housings even when a short sample appears to fit. Do not copy the value from a neighboring series unless the manufacturer documents the same construction and approval. For this requirement, the approval record should explicitly address matching pitch to pcb pads.
Datasheet dimensional drawings
State the requirement in terms that engineering, purchasing and inspection can all verify. If the catalog does not provide the needed value, request a drawing or test record before approval. Confirm the result on a production-representative sample before releasing tooling or volume orders.
Common Pitch Selection Errors
This section explains common pitch selection errors and identifies the values that need to be fixed on the drawing, datasheet or RFQ. A change in one value can alter fit, rating or service access.
Mixing 5.0mm and 5.08mm (incompatible!)
Treat the stated millimeter value as one nominal dimension or conductor class; verify the complete tolerance and profile drawing. Verify the dimensional drawing against the board or mating layout. Small pitch or orientation differences accumulate across poles and can stress pins, solder joints or housings even when a short sample appears to fit. Pitch creates geometric space, but creepage, clearance and current remain completed-product ratings.
Ignoring mating connector pitch
Verify the dimensional drawing against the board or mating layout. Small pitch or orientation differences accumulate across poles and can stress pins, solder joints or housings even when a short sample appears to fit. Keep the evidence with the drawing and sample record so purchasing cannot substitute a similar-looking part.
Related guidance: Terminal Block Types: The Complete Guide with Pictures and Barrier Terminal Blocks Explained: Uses, Ratings & Selection.
FAQ: Frequently Asked Questions
Is 5.0mm the same as 5.08mm pitch?
No. The difference is 0.08 mm per interval, and it accumulates across the poles. A two-pole sample may appear to fit, but a long plug, header or PCB footprint can bind, misalign or overstress solder joints.
What pitch should I use for 10A signals?
Current alone cannot determine pitch. For a 10 A signal or control circuit, also check wire size, voltage, creepage, clearance, connector mating and board temperature; 5.0 or 5.08 mm may be common, but the datasheet decides.
How does pitch affect creepage distance?
A wider pitch can provide more geometric room for insulation and conductive material, but it does not itself prove creepage or voltage performance. Use the completed product's declared dimensions and ratings for the applicable pollution degree and material group.
Next Steps: Choosing the Right Terminal Block
Turn the guide into a short specification before requesting a quotation. Record the exact function, conductor, electrical ratings, dimensions, mounting, environment, accessories and destination-market approvals, then evaluate a sample in the real assembly.
Browse relevant products — compare complete terminal blocks and connectors catalog, unipolar terminal blocks, and one-side-entry screw connectors.
Request the full catalog and drawings — keep the exact item number, revision, dimensions, ratings and accessory list together.
Evaluate production-representative samples — use the actual wire, ferrule or lug, tool, mounting and enclosure conditions.
Send a complete RFQ to engineering — include current, voltage, conductor, environment, quantity, approvals and any OEM/ODM requirements.
Antong has manufactured terminal blocks since 1989, operating a 55,000 m² production facility with ISO 9001 quality management and shipping to 70+ countries. Product parameters and certifications vary by exact model; request the current datasheet and approval evidence before releasing the bill of materials.
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References & standards
IEC 60947-7-1, Low-voltage switchgear and controlgear — Part 7-1: Ancillary equipment — Terminal blocks for copper conductors — webstore.iec.ch
IEC 60112, Comparative tracking index of solid insulating materials — webstore.iec.ch
Antong product documentation, Terminal blocks, brass bars, factory and quality information — www.safetypass.com
Technical content prepared by the Antong Engineering Team from 35+ years of terminal block manufacturing experience. Values, compatibility and approvals must always be confirmed against the exact product datasheet and applicable installation standard before design release.