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Starrett C391 60 degree center gage tempered steel with 14 20 24 32 graduations

Starrett

Starrett C391 60 Degree Center Gage Game

SKU CH-PCXB-HP5BS

A tempered-steel centre gage with 14ths, 20ths, 24ths and 32nds graduations for checking US 60-degree thread pitches

  • TypeToys
  • Tempered steel construction ensures lasting durability
  • 60 degree angle matches American standard thread forms
  • Graduations in 14, 20, 24 and 32nds simplify thread identification
  • Helps determine threads per inch for accurate tool setting
  • Ideal for grinding and setting screw cutting tools

Starrett C391 60 Degree Center Gage

The Starrett C391 is a hardened steel centre gage designed for machinists and toolmakers who need to check or set 60 degree thread profiles. It provides a reliable physical reference for grinding and adjusting screw-cutting tools in a workshop environment.

Graduations in 14ths, 20ths, 24ths and 32nds

The gage features four distinct graduation scales covering 14, 20, 24 and 32 threads per inch, allowing direct verification of American Standard or US 60 degree thread pitches. This specific range determines whether the tool matches the threads you are cutting or inspecting.

Tempered steel construction with no accessories

The tool is supplied as a single piece of tempered steel without additional software, cases or calibration certificates. Its durability comes from the material itself, so users must provide their own storage and handling procedures to maintain accuracy.

Highlights

  • Tempered steel construction ensures lasting durability
  • 60 degree angle matches American standard thread forms
  • Graduations in 14, 20, 24 and 32nds simplify thread identification
  • Helps determine threads per inch for accurate tool setting
  • Ideal for grinding and setting screw cutting tools

Specifications

TypeToys

Questions about this item

How do the 14ths, 20ths, 24ths and 32nds graduations help when checking threads on a lathe?

The four scales let you match the pitch of American Standard 60-degree threads directly, so you can verify threads per inch without calculation.

Does the 60-degree angle on this gage match the Unified thread standard used in US workshops?

Yes, the 60-degree profile corresponds to the US 60-degree thread form, making it suitable for setting and grinding screw-cutting tools to that standard.

Is the tempered steel gage thin enough to slide into a tool-post holder for quick reference while cutting?

The tempered steel construction is designed for shop use, allowing it to fit in tight set-ups when grinding or setting thread-cutting tools.

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