ISO 261 Metric Thread Series
Preferred diameter and pitch combinations for metric threads.
Referenced for metric designation and pitch-plan context in engineering explanations.
Use related standards and concepts to connect profile geometry, designation planning, dimensions, and tolerance interpretation.
Use BoltLab tools and charts for workflow interpretation while final release values come from approved standards documents.
What This Standard Covers
When Engineers Use It
ISO 261 planning quick table
| Decision point | ISO 261 role | Downstream dependency |
|---|---|---|
| Designation selection | Preferred diameter and pitch planning | Feeds ISO 724 dimensional context |
| Series strategy | Coarse/fine planning baseline | Feeds ISO 262 selected fine combinations |
| Specification handoff | Normalizes thread notation | Feeds ISO 965 tolerance selection |
Related Standards
Related Concepts
Related tools and charts
FAQ
What does ISO 261 Metric Thread Series primarily define?
ISO 261 Metric Thread Series provides engineering guidance for one part of thread specification workflow and is used alongside related ISO standards rather than in isolation.
When do engineers typically use this standard?
Engineers use it when selecting, validating, or reviewing thread specifications and coordinating drawings, metrology, and production decisions.
How does BoltLab help interpret this standard?
BoltLab tools and charts accelerate identification, comparison, and tolerance-context checks while final release values still come from approved standards documents.
Does this page reproduce copyrighted standards tables?
No. BoltLab provides public-summary explanations, engineering context, and workflow guidance without reproducing protected standards text.
Which related standard should I review next?
Use the Related Standards section to move through profile, designation, dimensions, and tolerance standards in a coherent sequence.