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. 833-6436
Mfr. Part No.293-821-30
BrandMitutoyo
MYR1,340.10
Each
units
±2 μm 0.001 mm Metric External - - Yes - - 25mm 0mm
RS Stock No. 397-6584
Mfr. Part No.102-217
BrandMitutoyo
MYR338.76
Each
units
±0.002 mm 0.01 mm Metric External - - No Case, Gauge - 25mm 0mm
RS Stock No. 572-561
Mfr. Part No.DW934
BrandStarrett
MYR1,577.75
Each
units
±0.01 mm - Metric Internal - - No Adjustment Tool, Measuring Rod, Micrometer Head - 300mm 50mm
RS Stock No. 833-6427
Mfr. Part No.293-240-30
BrandMitutoyo
MYR1,543.41
Each
units
±1 μm 0.001 mm Metric External - - Yes - - 25mm 0mm
RS Stock No. 572-088
Mfr. Part No.103-137
BrandMitutoyo
MYR401.30
Each
units
±0.002 mm 0.01 mm Metric External - - No Adjustment Tool, Case, User Manual - 25mm 0mm
RS Stock No. 795-9906
Mfr. Part No.368-913
BrandMitutoyo
MYR11,247.88
Each
units
- 0.005 mm Metric Internal - - No 368-166, 368-167, 368-168, 368-169 - 50mm 20mm
RS Stock No. 785-7840
BrandRS PRO
MYR1,554.56
Each
units
- 0.01 mm Metric Internal - - No Barrel, Micrometer, Sleeve, Spindle Locking Knob, Storage Case - 600mm 50mm
RS Stock No. 705-1213
BrandRS PRO
MYR1,686.54
1 Set
Set(s)
±0.004 mm 0.01 mm Metric External - - No Setting Rod - 150mm 0mm
RS Stock No. 833-6442
Mfr. Part No.293-340-30
BrandMitutoyo
MYR1,284.03
Each
units
±0.00005 in 0.001 mm Both External - - Yes - - 25mm 0mm
RS Stock No. 794-3519
Mfr. Part No.293-145-30
BrandMitutoyo
MYR2,117.37
Each
units
±1 μm 0.001 mm Metric Special - Yes Yes - - 25mm 0mm
RS Stock No. 574-343
Mfr. Part No.340-351-10
BrandMitutoyo
MYR6,453.15
Each
units
±0.001 in 0.00005 in Both External Yes Yes Yes Battery, Case, User Manual Yes 152mm 0mm
RS Stock No. 705-1260
BrandRS PRO
MYR1,234.74
Each
units
±0.003 mm 0.001 mm Both Internal - - Yes Battery, Case, Setting Ring, User Manual Yes 30mm 5mm
RS Stock No. 397-6590
Mfr. Part No.102-218
BrandMitutoyo
MYR490.95
Each
units
±0.002 mm 0.01 mm Metric External - - No Case, Gauge - 50mm 25mm
RS Stock No. 705-1266
BrandRS PRO
MYR1,702.30
1 Set
Set(s)
±0.001 in 0.0001 in Imperial External - - No Setting Rod - 152mm 0mm
RS Stock No. 705-1216
BrandRS PRO
MYR906.87
Each
units
±0.002 mm 0.001 mm Both External - - Yes Battery, Case, User Manual Yes 25mm 0mm
RS Stock No. 705-1229
BrandRS PRO
MYR507.54
Each
units
±0.002 mm 0.001 mm Both External - - Yes - Yes 25mm 0mm
RS Stock No. 795-9915
Mfr. Part No.368-914
BrandMitutoyo
MYR13,224.28
Each
units
- 0.005 mm Metric Internal - - No Extension Rod, Ring Gauge - 100mm 50mm
RS Stock No. 785-7834
BrandRS PRO
MYR650.33
Each
units
0.005 mm 0.01 mm Metric Internal - - No Barrel, Fitted Case with Adjustment Tools, Micrometer, Sleeve, Spindle Locking Screw - 30mm 5mm
RS Stock No. 315-7834
BrandRS PRO
MYR2,051.63
Each
units
±0.005 mm 0.001 mm Both Depth - - Yes - Yes 150mm 0mm
RS Stock No. 572-123
Mfr. Part No.103-139-10H
BrandMitutoyo
MYR791.00
Each
units
±0.002 mm 0.01 mm Metric External - - No Adjustment Tool, Case, Stand, User Manual - 75mm 50mm