Micrometers

What are 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 calipers e.g. opposing ends joined by a frame.
Micrometers are composed of:
• 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.
• Lock nut / 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 end of 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: caliper-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. 572-101
Mfr. Part No.103-138
BrandMitutoyo
SGD156.13
Each
units
±0.002 mm 0.01 mm Metric External - - No Adjustment Tool, Case, Stand, User Manual - 50mm 25mm
RS Stock No. 795-9915
Mfr. Part No.368-914
BrandMitutoyo
SGD3,838.06
Each
units
- 0.005 mm Metric Internal - - No Extension Rod, Ring Gauge - 100mm 50mm
RS Stock No. 397-6590
Mfr. Part No.102-218
BrandMitutoyo
SGD142.49
Each
units
±0.002 mm 0.01 mm Metric External - - No Case, Gauge - 50mm 25mm
RS Stock No. 572-123
Mfr. Part No.103-139-10H
BrandMitutoyo
SGD205.68
Each
units
±0.002 mm 0.01 mm Metric External - - No Adjustment Tool, Case, Stand, User Manual - 75mm 50mm
RS Stock No. 794-3519
Mfr. Part No.293-145-30
BrandMitutoyo
SGD529.49
Each
units
±1 μm 0.001 mm Metric Special - Yes Yes - - 25mm 0mm
RS Stock No. 796-0019
Mfr. Part No.7822
BrandMitutoyo
SGD89.51
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. 794-3513
Mfr. Part No.293-146
BrandMitutoyo
SGD551.69
Each
units
±1 μm 0.001 mm Metric Special - Yes Yes - - 50mm 25mm
RS Stock No. 432-255
Mfr. Part No.101468M
BrandMitutoyo
SGD26.59
Each
units
- - Metric Ball Attachment - - No - - - -
RS Stock No. 794-3525
Mfr. Part No.293-141
BrandMitutoyo
SGD699.66
Each
units
±1 μm 0.001 mm Metric Special Yes Yes Yes - - 50mm 25mm
RS Stock No. 486-8260
Mfr. Part No.293-345
BrandMitutoyo
SGD516.80
Each
units
±0.00005 in 0.00005 in Both External - - Yes Battery, Case, User Manual Yes 50mm 25mm
RS Stock No. 794-3522
Mfr. Part No.293-140-30
BrandMitutoyo
SGD566.30
Each
units
±1 μm 0.001 mm Metric Special Yes Yes Yes - - 25mm 0mm
RS Stock No. 572-561
Mfr. Part No.DW934
BrandStarrett
SGD457.56
Each
units
±0.01 mm - Metric Internal - - No Adjustment Tool, Measuring Rod, Micrometer Head - 300mm 50mm
RS Stock No. 795-9906
Mfr. Part No.368-913
BrandMitutoyo
SGD3,264.45
Each
units
- 0.005 mm Metric Internal - - No 368-166, 368-167, 368-168, 368-169 - 50mm 20mm
RS Stock No. 603-205
Mfr. Part No.DY160
BrandStarrett
SGD343.81
Each
units
±0.01 mm - Metric - - - - - - 150mm -
RS Stock No. 486-8254
Mfr. Part No.293-344
BrandMitutoyo
SGD531.23
Each
units
±0.00005 in 0.00005 in Both External - - Yes Battery, Case, User Manual Yes 25mm 0mm
RS Stock No. 397-6584
Mfr. Part No.102-217
BrandMitutoyo
SGD96.82
Each
units
±0.002 mm 0.01 mm Metric External - - No Case, Gauge - 25mm 0mm
RS Stock No. 157-1187
Mfr. Part No.DY094
BrandStarrett
SGD98.09
Each
units
±0.002 mm - Metric External - - No - - 25mm 0mm
RS Stock No. 184-6711
Mfr. Part No.293-676-20
BrandMitutoyo
SGD895.39
Each
units
0.0001 in, ±2 μm 0.001 mm Imperial, Metric External Yes Yes Yes Battery, Box - 30mm 0mm
RS Stock No. 833-6433
Mfr. Part No.293-330-30
BrandMitutoyo
SGD507.84
Each
units
±0.00005 in 0.001 mm Both External Yes - Yes - - 25mm 0mm
RS Stock No. 157-1171
Mfr. Part No.DY093
BrandStarrett
SGD139.97
Each
units
±0.0001 in - Imperial External - - No - - 50mm 25mm