Starrett - Outside Micrometers Special Functions
Screw Thread Micrometers for measuring pitch diameter
No. 575, 575M Series –
Range: 0-1" (0-25mm)
No. 585, 585M Series – Range: 1-2" (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 50 mm (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 0.004 mm
  • 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.

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.

Series 575M and 585M – Metric
For measuring I.S.O. metric and MJ screw threads. Series 585M micrometers come with a 25 mm standard at no extra cost.


Screw Thread Micrometers for measuring pitch diameter
No. 575, 575M Series -
Range: 0-1" (0-25 mm)
No. 585, 585M Series - Range:1-2" (25-50 mm)

No. 575 Series - Range: 0-1"
Catalog No. EDP No. Description List price
575AP 56159 0-1" Range, .001" Grad, 7-9 TPI 209.00
575BP 56160 0-1" Range, .001" Grad, 10-13 TPI 209.00
575CP 56161 0-1" Range, .001" Grad, 14-18 TPI 209.00
575DP 56162 0-1" Range, .001" Grad, 20-24 TPI 209.00
575EP 56163 0-1" Range, .001" Grad, 28-30 TPI 209.00
575FP 56164 0-1" Range, .001" Grad, 32-40 TPI 209.00

No. 575M Series - Range: 0-25 mm
Catalog No. EDP No. Description List price
575MAP 56321 0-25mm Range, 0.01mm Grad, 3-4 mm Pitch 209.00
575MBP 56322 0-25mm Range, 0.01mm Grad, 2-2.5 mm Pitch 209.00
575MCP 56323 0-25mm Range, 0.01mm Grad, 1.25-1.75 mm Pitch 209.00
575MDP 56324 0-25mm Range, 0.01mm Grad, 0.75-1.0 mm Pitch 209.00
575MEP 56325 0-25mm Range, 0.01mm Grad, 0.5-0.7 mm Pitch 209.00
575MFP 56326 0-25mm Range, 0.01mm Grad, .35-.45 mm Pitch 209.00

No. 585 Series - Range:1-2"
Catalog No. EDP No. Description List price
585AP 56165 1-2" Range, .001" Grad, 4 1/2-6 TPI 236.00
585BP 56166 1-2" Range, .001" Grad, 7-9 TPI 236.00
585CP 56167 1-2" Range, .001" Grad, 10-13 TPI 236.00
585DP 56168 1-2" Range, .001" Grad, 14-18 TPI 236.00
585EP 56169 1-2" Range, .001" Grad,  20-24 TPI 236.00
585FP 56170 1-2" Range, .001" Grad,  28-30 TPI 236.00

No. 585M Series - Range:25-50 mm
Catalog No. EDP No. Description List price
585MAP 56327 25-50mm Range, 0.01mm Grad, 4.5-6 Threads per mm 236.00
585MBP 56328 25-50mm Range, 0.01mm Grad, 3-4 Threads per mm 236.00
585MCP 56329 25-50mm Range, 0.01mm Grad, 2-2.5 Threads per mm 236.00
585MDP 56330 25-50mm Range, 0.01mm Grad, 1.25-1.75 Threads per mm 236.00

Cases
Catalog No. EDP No. Description List price
910 55397 Steel/Vinyl Case for 1" (25mm) Micrometers 6.60
912 55399 Steel/Vinyl Case for 2" (50mm) Micrometers (Nos. 2, 2A, 256, 585,1212) 12.00

J.W. Donchin Co.
Ph: 773-261-2182 • Fax: 773-261-2867 • Email: sales@jwdonchin.com