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Mitotoyo Test Indicator Repair Manual

For Mitutoyo Series 513-400 manufactured between 1997 and 2016

Can it be fixed?

We shall begin by examining the Mitutoyo indicator to see if it is worth repairing. The most common reasons why these indicators come in for repair:

  • The bezel is falling off or the crystal is cracked or has popped out. These are plastic parts which get damaged easily.
  • Oil has gotten into the hairspring and the indicator no longer repeats or is sluggish.
  • The ball bearings are ruined due to rust or shock at the contact point end.
  • The contact point has broken off leaving the thread in the pivot.
  • Everything is gummed up with coolant or grime.
  • Someone has tampered with ball bearing adjustment.
Bergeon Jeweler's Screw Driver Set

Quality repairs start with quality tools. We would not want to be without our Bergeon Jeweler's Screw Driver Set.

Table of Contents
  1. Specifications: Mitutoyo Series 513-400
  2. Can it be fixed?
  3. Repair Tools
  4. Disassembly
  5. Cleaning
  6. Reassembly
  7. Pre-load the hairspring
  8. Intstalling the new bezel
  9. Special Repair Situation: Replacing the hand
  10. Bent or broken shaft on the center pinion
  11. Replacing a damaged hairspring
  12. When the bezel rotates too freely
  13. Calibration
  14. Mitutoyo contact points
  15. How to install a contact point
  16. Cosine Error
  17. Parts breakdown for multiple revolution models
  18. Parts breakdown for single revolution models
  19. Model specific parts
  20. Updates

Mitutoyo has changed the design and construction of its indicators many times since the 1960s. You are not likely to find spare parts for models made prior to 1997.

➡ Before you invest any time in a repair attempt, make sure you won’t need any obsolete parts.

Second generation models (1997 to 2016) rarely need more than a cleaning and a new bezel/crystal assembly. Even one additional part won’t break the bank.

Which models are covered in this repair manual?

The following models are covered in this repair manual. This also includes models with -01 or -06 suffixes.

513-402, 513-403, 513-412, 513-462, 513-463, 513-442, 513-443, 513-446 513-452, 513-453, 513-401, 513-404, 513-405, 513-414, 513-415, 513-424 513-474, 513-464, 513-465, 513-466, 513-425, 513-426, 513-444, 513-445 513-454, 513-455

➡ This repair manual does not cover models ending in -10 or -16 which began production in 2017.

For a successful repair, start at the beginning and follow all the steps in this book. Do not jump to any single conclusion. You will probably be disappointed with the results.

If you find that some aspect of the repair is not covered or is less than clear in this manual, please check this website for updates, customer questions and, hopefully, appropriate and useful answers.


Hint: Phillips screwdiver size 0 is an absolutely essential tool for repairing the Mitutoyo test indicators.

Companion Reference Guide for Test Indicators
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