Metric Fine Thread Chart

Introduction

Quick Answer: The Metric Fine Thread Chart provides a quick reference for common ISO Metric fine thread sizes and their basic dimensions.

The Metric Fine Thread Chart provides a quick reference for common ISO Metric fine thread sizes and their basic dimensions.

Use this chart to find thread designation, nominal diameter, pitch, major diameter, pitch diameter, minor diameter, and other basic thread dimensions.

Metric fine threads use a smaller pitch than the corresponding standard coarse thread for the same nominal diameter and are used in applications where a finer thread is appropriate.

Metric Fine Thread Chart

Click Thread Link to check more data for each thread.

Need More Information About Metric Fine Threads?

The Metric Fine Thread Guide provides additional information about Metric Fine threads, including their characteristics, applications, designation, and comparison with Metric Coarse threads.

Read the Metric Fine Thread Guide →

How to Use the Metric Fine Thread Chart

Metric fine thread designations normally identify the nominal diameter and pitch.

For example:

M10 × 1.25

indicates:

• M → Metric thread
• 10 mm → nominal diameter
• 25 mm → thread pitch

Use the chart to compare different fine-pitch options and their corresponding dimensions.

Frequently Asked Questions

Q1: What is a Metric Fine thread?

A Metric Fine thread is an ISO Metric thread with a finer pitch than the corresponding standard coarse thread for the same nominal diameter.

Q2: Why are Metric Fine threads used?

Fine threads can be useful where a smaller pitch, finer adjustment, or other application-specific mechanical characteristics are required. The appropriate thread should always be selected based on the engineering requirements.

Q3: What is the difference between M10 × 1.5 and M10 × 1.25?

Both have a nominal diameter of 10 mm, but their pitches are different:

• M10 × 1.5 → coarse thread
• M10 × 1.25 → fine thread

They are therefore not directly interchangeable.

Q4: Can I use a Metric Fine thread in a Metric Coarse threaded hole?

No. The pitch must match for mating threads. An M10 × 1.25 external thread cannot properly mate with an M10 × 1.5 internal thread.

Q5: Are Metric Fine threads standardized?

Yes. Metric fine threads are covered by the applicable ISO Metric thread standards, with specific size and pitch combinations defined by the relevant standards.

Related Thread Resources

• Metric Fine Thread Guide
• Metric Coarse Thread Chart
• Metric Coarse Thread Guide
• ISO Metric Thread Standard
• UNC Thread Chart
• UNF Thread Chart
• Thread Definitions
• Thread Standards
• Thread in EMI Filters
• Thread in Feedthrough Capacitors

LCA Thread Charts

The LCA Thread Charts are designed as a practical engineering reference for quickly locating common thread dimensions and comparing standardized thread sizes.

Use the chart that matches your thread system, or explore the individual Thread Specifications and Thread Engineering Guides when more detailed information is required.

Thread Definitions → Thread Standards → Thread Charts → Thread Specifications → Thread Engineering Guides

Engineering Support CTA: Selecting a threaded EMI filter or feedthrough capacitor? Share the thread standard and size, panel thickness, voltage/current, capacitance, and environmental requirements with LCA engineers. View Thread Mount Feedthrough Filters