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Home Starrett Tool Index Special Function Outside Micrometers Starrett Tool Index pointer Screw Thread Micrometers for measuring Pitch Diameter

Starrett Precision Measuring Tools

Starrett Screw Thread Micrometers for
measuring Pitch Diameter

Screw Thread Micrometers for measuring Pitch Diameter by Starrett

No. 575 Series (0-1")
No. 575M Series (0-25mm)

No. 585 Series (1-2")
No. 585M Series (25-50mm)


These micrometers have a pointed spindle and a double V-anvil, both shaped to contact the screw thread as shown in the drawing. The micrometer reading therefore gives the pitch diameter.

Readability Features
  • Starrett satin chrome finish – no glare – resists rust
  • Advanced sleeve design with staggered lines and distinct figures for precise and easy readability
  • Decimal equivalents on inch tools

Ease-of-Handling Features
  • Balanced frame and thimble design for easy handling and better readability
  • Gracefully designed tapered frame for use in narrow slots and tight places
  • Furnished with fixed (non-rotating) anvil, but swivel anvils available on special order
  • Available in capacity over 2" or 50mm (special order)

Accuracy and Long-Life Features
  • One-piece frame of drop forged steel
  • Extremely hard and stable one-piece spindle (the heart of our accuracy)
  • Quick and easy adjustment
  • Starrett workmanship
  • Design allows 50% to 75% contact with the thread to be measured, thereby insuring contact with the pitch diameter at all times
  • Design also insures against contact with the root area of the thread
  • Tools are accurate to ±.0002" or 0.004mm
Starrett 575, 585 Series - Screw Thread Micrometers for measuring Pitch Diameter

No. 575AP 0-1" micrometer gages pitch diameter of a screw thread. This micrometer is read directly in inches in terms of pitch diameter, since with the anvil and spindle in the position shown in the drawing, the line AB corresponds to the 0 reading.

Series 575 and 585 - Inches

For measuring American Unified National series and Unified J series screw threads. Series 585 micrometers come with a one-inch standard at no extra cost.
Graduation - .001"
Range, Threads Per Inch Capacity, Pitch Diameter Catalog No. Price  
7-9 0-1" 575AP $254.50
10-13 575BP $254.50
14-18 575CP $254.50
20-24 575DP $254.50
28-30 575EP $254.50
32-40 575FP $254.50
4 1/2-6 1-2" 585AP $293.00
7-9 585BP $293.00
10-13 585CP $293.00
14-18 585DP $293.00
20-24 585EP $293.00
28-30 585FP $293.00

Series 575M and 585M - Metric

For measuring I.S.O. metric and MJ screw threads. Series 585M micrometers come with a 25mm standard at no extra cost.
Graduation - 0.01mm
Range, Pitch in mm Capacity, Pitch Diameter Catalog No. Price  
3-4 0-25mm 575MAP $254.50
2-2.5 575MBP $254.50
1.25-1.75 575MCP $254.50
0.75-1 575MDP $254.50
0.5-0.7 575MEP $254.50
0.35-0.45 575MFP $254.50
4.5-6 25-50mm 585MAP $293.00
3-4 585MBP $293.00
2-2.5 585MCP $293.00
1.25-1.75 585MDP $293.00
Measuring tip:
These tools are accurate for general purposes, especially if set to a thread plug gage of the size to be measured. If higher accuracy is required, please refer to our No. 1130 Cone and Vee Thread Gaging System.
NOTE: Available on special order with swivel anvil – also in capacities over 2" (50mm).
NOTE: See reference tables, back of catalog for pitch diameters and other screw thread data.




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Starrett Precision Measuring Tools Starrett Precision Measuring Tool Index


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