TERMINAL BLOCK PITCH DEEP DIVE
5.0 mm vs 5.08 mm terminal block pitch.
The difference is only 0.08 mm between adjacent contacts, but it grows across every interval. Calculate the nominal center span, then verify the complete footprint, mating pair and sample.
0.08 mm difference per center-to-center interval
WHY THE DISTINCTION MATTERS
Both pitches are common. The exact variant still matters.
Terminal block portfolios may include a metric 5.0 mm version and an inch-based 5.08 mm version. The labels are close enough to be confused in photos or informal descriptions, but they define different nominal PCB centerlines.
CENTER-SPAN CALCULATOR
See how the 0.08 mm pitch difference accumulates.
Enter the number of positions. The calculator compares the nominal distance from the center of the first contact to the center of the last contact.
Choose 2 to 24 positions.
Formula: center span = (positions - 1) x pitch. This is not the total housing length and does not prove plug/header or PCB compatibility.
REFERENCE TABLE
Nominal first-to-last center span by position count.
The table uses the same formula as the calculator. It shows contact-center span only, not total housing length, pin tolerance or mating compatibility.
MEASUREMENT WORKFLOW
Measure across several contacts to reduce ambiguity.
- 01
Count the positions.
A 5-position block has four center-to-center intervals.
- 02
Measure first center to last center.
Use the contact or pin centers, not the outside housing dimension.
- 03
Divide by positions minus one.
The result is the nominal pitch estimate for comparison with the drawing.
- 04
Verify the complete interface.
Check pin layout, housing, orientation, keying, latch, flange and mating part.
BUYER FAQ
5.0 mm and 5.08 mm pitch questions.
Is 5.08 mm the same as 5.0 mm terminal block pitch?
No. They are two different nominal centerline spacings. The difference is 0.08 mm per interval and accumulates across a multi-position connector.
How should terminal block pitch be measured?
Measure from the center of the first contact to the center of the last contact, then divide by the number of intervals, which is positions minus one. Do not use the outside housing length as pitch.
Can a 5.0 mm plug mate with a 5.08 mm header?
Do not assume it can. Pitch, total span, contact geometry, housing, orientation, keying and latch details must all match. Confirm the exact drawing and sample as a pair.
Why do some product families list 5.0/5.08 mm?
A manufacturer may offer separate variants or a family covering both nominal pitches. That does not mean every SKU or PCB footprint accepts both. Verify the exact part number and drawing.
What should be sent for a 5.0 or 5.08 mm replacement request?
Send the reference model, position count, first-to-last center measurement, PCB footprint or drawing, plug/header photos, mounting direction and electrical requirements.