Micrometers

A micrometer (sometimes called micrometer screw gauge) is a precision measuring instrument, used to obtain very fine measurements and available in metric and imperial versions. They use a calibrated screw or thread (found internally on the spindle) for precise measurement of components in mechanical engineering and machining as well as most mechanical trades. They usually come in the form of callipers e.g. opposing ends joined by a frame. Learn how to calibrate and use micrometers correctly in our comprehensive micrometers guide.

What are Micrometers are composed of?

Here is a list of different components that make up a typical multimeter:

  • Frame - The C-shaped body that holds the anvil and barrel in constant relation to each other,
  • Anvil - The shiny part that the spindle moves toward, and that the sample rests against,
  • Sleeve/barrel/stock - The stationary round component with the linear scale on it, sometimes with vernier markings,
  • Locknut / lock-ring / thimble lock - The knurled component (or lever) that tightens to hold the spindle stationary,
  • Spindle - The shiny cylindrical component that the thimble causes to move toward the anvil,
  • Thimble - The component that turns by using a person’s thumb. Graduated markings,
  • Ratchet stop - Device on the end of the handle that limits applied pressure by slipping at a calibrated torque,
  • Screw.

How do they work?

The precision is determined by the thread pitch of the spindle. The spindle is a very accurately machined screw and the object to be measured is placed between the spindle and the anvil. The spindle is moved by turning the ratchet knob or thimble until the object to be measured is lightly touched by both the spindle and the anvil.

Types of Micrometers

  • Outside micrometer: most common type used to measure external dimensions such as the outside diameter of an object.
  • Inside micrometer; used to measure inside dimensions like the inside diameter of a hole or tube. There are two types: calliper-type and tubular and rod.
  • Depth micrometer: these are used to measure the depths of holes, slots and steps. They come with a variety of interchangeable rods of different lengths so that they can be used to measure a range of depths.

Advantages

  • Provide very accurate measurements and are considered one of the most accurate types of measuring device
  • Ratchet speeder helps to provide reliable measurements
  • Integrated scales, the sleeve scale and thimble scale are built into the tool, another measuring instrument such as a ruler or tape measure is not required
  • Durability and long-lasting and unlikely to need replacing or repairing

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Description Price Accuracy Resolution Imperial or Metric Micrometer Type Calibrated SPC Data Output Data Processing Battery Operated Set Contents Metric-Imperial Conversion Maximum Measurement Minimum Measurement
RS Stock No. 431-577
Mfr. Part No.340-351-10
BrandMitutoyo
kr 10 994,86
Each
Units
±0.001 in 0.00005 in Both External UKAS Yes Yes Yes Battery, Case, User Manual Yes 152mm 0mm
RS Stock No. 574-343
Mfr. Part No.340-351-10
BrandMitutoyo
kr 10 297,22
Each
Units
±0.001 in 0.00005 in Both External - Yes Yes Yes Battery, Case, User Manual Yes 152mm 0mm
RS Stock No. 785-7840
BrandRS PRO
kr 2 827,00
Each
Units
- 0.01 mm Metric Internal - - - No Barrel, Micrometer, Sleeve, Spindle Locking Knob, Storage Case - 600mm 50mm
RS Stock No. 192-5899
BrandRS PRO
kr 3 093,74
Each
Units
- 0.01 mm Metric Internal UKAS - - No Barrel, Micrometer, Sleeve, Spindle Locking Knob, Storage Case - 600mm 50mm
RS Stock No. 796-0019
Mfr. Part No.7822
BrandMitutoyo
kr 551,54
Each
Units
- - Metric Contact Point Set - - - No Flat Point 10 mm, Flat Point 5 mm, Needle Point, Shell Type Point, Spherical Point - - -
RS Stock No. 667-3938
BrandRS PRO
kr 5 264,58
Pr. Set
Set(s)
±0.004 mm 0.001 mm Metric Internal - - - No - - 20mm 12mm
RS Stock No. 704-8771
BrandRS PRO
kr 1 964,31
Each
Units
±0.002 mm 0.001 mm Both External UKAS - - Yes Battery, Case, User Manual Yes 25mm 0mm
RS Stock No. 192-5898
Mfr. Part No.293-240-30
BrandMitutoyo
kr 2 798,59
Each
Units
- - - - - - - - - - - -
RS Stock No. 794-3522
Mfr. Part No.293-140-30
BrandMitutoyo
kr 3 843,04
Each
Units
±1 μm 0.001 mm Metric Special - Yes Yes Yes - - 25mm 0mm
RS Stock No. 725-1946
BrandRS PRO
kr 717,58
Each
Units
±0.004 mm 0.01 mm Metric External UKAS - - No Adjustment Tool, Case - 50mm 25mm
RS Stock No. 725-5724
BrandRS PRO
kr 312,99
Each
Units
±0.004 mm 0.01 mm Metric External - - - No Adjustment Tool, Case - 25mm 0mm
RS Stock No. 725-5702
BrandRS PRO
kr 429,75
Each
Units
±0.004 mm 0.01 mm Metric External - - - No Adjustment Tool, Case - 50mm 25mm
RS Stock No. 794-5593
Mfr. Part No.293-140-30
BrandMitutoyo
kr 4 160,99
Each
Units
±1 μm 0.001 mm Metric Special UKAS Yes Yes Yes - - 25mm 0mm
RS Stock No. 833-6427
Mfr. Part No.293-240-30
BrandMitutoyo
kr 2 479,22
Each
Units
±1 μm 0.001 mm Metric External - - - Yes - - 25mm 0mm
RS Stock No. 725-2009
BrandRS PRO
kr 651,92
Each
Units
±0.004 mm 0.01 mm Metric External UKAS - - No Adjustment Tool, Case - 25mm 0mm
RS Stock No. 705-1216
BrandRS PRO
kr 1 608,31
Each
Units
±0.002 mm 0.001 mm Both External - - - Yes Battery, Case, User Manual Yes 25mm 0mm
RS Stock No. 315-7834
BrandRS PRO
kr 3 884,68
Each
Units
±0.005 mm 0.001 mm Both Depth - - - Yes - Yes 150mm 0mm
RS Stock No. 704-8775
BrandRS PRO
kr 1 262,89
Each
Units
±0.002 mm 0.001 mm Both External UKAS - - Yes - Yes 25mm 0mm
RS Stock No. 157-1165
Mfr. Part No.DY092
BrandStarrett
kr 604,38
Each
Units
±0.0001 in - Imperial External - - - No - - 25mm 0mm
RS Stock No. 794-3516
Mfr. Part No.293-100-10
BrandMitutoyo
kr 20 380,50
Each
Units
±0.5 μm 0.0001 mm, 0.0005 mm Metric External - - Yes Yes - - 25mm 0mm