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. 704-8778
BrandRS PRO
£397.69
1 Set
Set(s)
±0.004 mm 0.01 mm Metric External UKAS - - No Setting Rod - 150mm 0mm
RS Stock No. 705-1213
BrandRS PRO
£247.69
1 Set
Set(s)
±0.004 mm 0.01 mm Metric External - - - No Setting Rod - 150mm 0mm
RS Stock No. 725-2009
BrandRS PRO
£59.76
Each
Units
±0.004 mm 0.01 mm Metric External UKAS - - No Adjustment Tool, Case - 25mm 0mm
RS Stock No. 725-5724
BrandRS PRO
£24.26
Each
Units
±0.004 mm 0.01 mm Metric External - - - No Adjustment Tool, Case - 25mm 0mm
RS Stock No. 192-5899
BrandRS PRO
£258.38
Each
Units
- 0.01 mm Metric Internal UKAS - - No Micrometer, Spindle Locking Knob, Barrel, Sleeve, Storage Case - 600mm 50mm
RS Stock No. 785-7840
BrandRS PRO
£222.88
Each
Units
- 0.01 mm Metric Internal - - - No Micrometer, Spindle Locking Knob, Barrel, Sleeve, Storage Case - 600mm 50mm
RS Stock No. 705-1244
BrandRS PRO
£72.95
Each
Units
0.004 mm 0.01 mm Metric Depth - - - No - - 25mm 0mm
RS Stock No. 704-8793
BrandRS PRO
£104.61
Each
Units
0.004 mm 0.01 mm Metric Depth UKAS - - No - - 25mm 0mm
RS Stock No. 785-7834
BrandRS PRO
£94.85
Each
Units
0.005 mm 0.01 mm Metric Internal - - - No Micrometer, Spindle Locking Screw, Barrel, Sleeve, Fitted Case with Adjustment Tools - 30mm 5mm
RS Stock No. 725-5702
BrandRS PRO
£29.75
Each
Units
±0.004 mm 0.01 mm Metric External - - - No Adjustment Tool, Case - 50mm 25mm
RS Stock No. 725-1946
BrandRS PRO
£65.25
Each
Units
±0.004 mm 0.01 mm Metric External UKAS - - No Adjustment Tool, Case - 50mm 25mm
RS Stock No. 192-5902
BrandRS PRO
£199.34
Each
Units
- 0.01 mm Metric Internal UKAS - - No Micrometer, Spindle Locking Knob, Barrel, Sleeve, Storage Case - 250mm 50mm
RS Stock No. 705-1248
BrandRS PRO
£138.41
Each
Units
0.004 mm 0.01 mm Metric Depth - - - No - - 150mm 0mm
RS Stock No. 785-7847
BrandRS PRO
£163.84
Each
Units
- 0.01 mm Metric Internal - - - No Micrometer, Spindle Locking Knob, Barrel, Sleeve, Storage Case - 250mm 50mm
RS Stock No. 785-7838
BrandRS PRO
£102.29
Each
Units
0.005 mm 0.01 mm Metric Internal - - - - Micrometer, Spindle Locking Screw, Barrel, Sleeve, Fitted Case with Adjustment Tools - 50mm 25mm
RS Stock No. 704-8797
BrandRS PRO
£166.62
Each
Units
0.004 mm 0.01 mm Metric Depth UKAS - - No - - 150mm 0mm
RS Stock No. 667-3938
BrandRS PRO
£432.95
1 Set
Set(s)
±0.004 mm 0.001 mm Metric Internal - - - No - - 20mm 12mm
RS Stock No. 307-4694
BrandRS PRO
£117.88
Each
Units
±0.004 mm 0.01 mm Metric External UKAS - - No Adjustment Tool, Case - 25mm 0mm
RS Stock No. 248-9180
BrandRS PRO
£87.35
Each
Units
±0.004 mm 0.01 mm Metric External - - - No Adjustment Tool, Case - 25mm 0mm
RS Stock No. 877-1791
BrandRS PRO
£336.84
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