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 SPC Data Output Data Processing Battery Operated Set Contents Metric-Imperial Conversion Maximum Measurement Minimum Measurement
RS Stock No. 486-8260
Mfr. Part No.293-345
BrandMitutoyo
MYR2,166.55
Each
units
±0.00005 in 0.00005 in Both External - - Yes Battery, Case, User Manual Yes 50mm 25mm
RS Stock No. 486-8254
Mfr. Part No.293-344
BrandMitutoyo
MYR1,830.38
Each
units
±0.00005 in 0.00005 in Both External - - Yes Battery, Case, User Manual Yes 25mm 0mm
RS Stock No. 572-101
Mfr. Part No.103-138
BrandMitutoyo
MYR600.47
Each
units
±0.002 mm 0.01 mm Metric External - - No Adjustment Tool, Case, Stand, User Manual - 50mm 25mm
RS Stock No. 705-1210
BrandRS PRO
MYR1,066.91
Each
units
±0.002 mm 0.001 mm Both External - - Yes Battery, Case, User Manual Yes 50mm 25mm
RS Stock No. 180-9465
BrandRS PRO
MYR1,281.48
Each
units
- 0.01 mm Both External - - - Adjustment Tools, Fitted Case, Mechanical Blade Micrometer, Setting Rod - 25mm 0mm
RS Stock No. 667-3938
BrandRS PRO
MYR2,968.46
1 Set
Set(s)
±0.004 mm 0.001 mm Metric Internal - - No - - 20mm 12mm
RS Stock No. 248-9180
BrandRS PRO
MYR612.63
Each
units
±0.004 mm 0.01 mm Metric External - - No Adjustment Tool, Case - 25mm 0mm
RS Stock No. 725-5702
BrandRS PRO
MYR203.94
Each
units
±0.004 mm 0.01 mm Metric External - - No Adjustment Tool, Case - 50mm 25mm
RS Stock No. 432-255
Mfr. Part No.101468M
BrandMitutoyo
MYR91.60
Each
units
- - Metric Ball Attachment - - No - - - -
RS Stock No. 785-7878
BrandRS PRO
MYR186.69
Each
units
0.003 mm 0.01 mm Both Special - - No Adjustment Tools, Barrel, Sleeve - 25mm 0mm
RS Stock No. 157-1165
Mfr. Part No.DY092
BrandStarrett
MYR338.67
Each
units
±0.0001 in - Imperial External - - No - - 25mm 0mm
RS Stock No. 603-198
Mfr. Part No.DY161
BrandStarrett
MYR1,185.50
Each
units
±0.0004 in - Imperial Depth - - No - - 152mm 0mm
RS Stock No. 877-1791
BrandRS PRO
MYR2,309.50
Each
units
±0.003 mm 0.001 mm Metric Depth - - Yes Ratchet Stop, Setting Rods, Spindle Lock, Supplied in Fitted Case, Tungsten Carbide Anvils Yes 158mm 0mm
RS Stock No. 705-1248
BrandRS PRO
MYR959.05
Each
units
0.004 mm 0.01 mm Metric Depth - - No - - 150mm 0mm
RS Stock No. 705-1279
BrandRS PRO
MYR2,033.32
Each
units
±0.002 mm 0.001 mm Both Special - - Yes Battery, Case, User Manual Yes 25mm 0mm
RS Stock No. 239-0399
BrandRS PRO
MYR248.75
Each
units
±0.001 in - Imperial External - - No Adjustment Tool, Case - 50mm 25mm
RS Stock No. 248-9196
BrandRS PRO
MYR702.44
Each
units
±0.01 mm 0.01 mm Metric Special - - No - - 25mm 0mm
RS Stock No. 794-3513
Mfr. Part No.293-146
BrandMitutoyo
MYR1,900.87
Each
units
±1 μm 0.001 mm Metric Special - Yes Yes - - 50mm 25mm
RS Stock No. 136-8094
BrandRS PRO
MYR840.95
Each
units
- - Both External - - - - Yes 75mm 0mm
RS Stock No. 136-8091
BrandRS PRO
MYR888.01
Each
units
- - Both Deep Throat - - - - Yes 25mm 0mm