Threads / Guided identification

No marking?
Start with the part.

Check the form before entering measurements. This guide keeps uncertain details visible and returns candidates within 111 nominal sizes.

1. Check the thread form

What are you measuring?Does the diameter change along the axis?Known thread profile

Check several complete threads. A damaged end or chamfer can give a misleading reading.

2. Measure across the crests

Diameter unitsOutside diameter (mm)External crests only; not the opening of a nut.Search range ± (mm, optional)Leave blank to start with ±0.2 mm (±0.007874 in). Adjust for your measurement; this is a lookup filter, not a manufacturing tolerance.How can you measure the pitch?

Pitch readingPitch (mm, optional)Leave blank if you have only the outside diameter.

Search rule: nominal outside diameter within your ± range (starter range ±0.2 mm when blank); pitch within ±0.1 TPI or ±0.02 mm when supplied. These are lookup filters, not thread acceptance limits.

No marking?Start with the part.

1. Check the thread form

2. Measure across the crests

Measure along the axis, across several spaces

No marking?
Start with the part.