Blue Spot Tools 0-25mm x 0.01mm External Measuring Micrometer 33921

Blue Spot Tools 0-25mm x 0.01mm External Measuring Micrometer

MPN: 33921

Barcode: 5028734339219

Size: 0-25mm x 0.01mm

Weight: 0.24kg

Overview:

The Blue Spot Tools 0-25mm Outside Micrometer reads external dimensions to a resolution of 0.01mm. With a range from 0 to 25mm, it suits dimensional checks across engineering and machining work.

You read measurements from two scales - the main sleeve and the rotating thimble. A lock screw on the frame holds the spindle in place, allowing you to record a reading without it shifting. The micro-meter comes supplied with an adjusting spanner for on-the-spot zeroing. It carries a Blue Spot Tools Lifetime Guarantee.

Key Features and Benefits

• Fine Resolution: Reads to 0.01mm, letting you detect very small dimensional differences between parts.
• 0-25mm Measuring Range: Covers the small diameters and thicknesses common in engineering and machining tasks.
• Metric Scale: Reads in millimetres, so it works directly with metric technical drawings and tolerances.
• Lock Screw: Holds the spindle in position mid-measurement, keeping the reading stable while you note it down.
• Adjusting Spanner Included: Lets you zero-set the instrument without needing a separate calibration tool.
• Blue Spot Tools Lifetime Guarantee: Backed for life against manufacturing defects.

Specs & Attributes

• Measuring Range: 0-25mm
• Graduation: 0.01mm
• Scale Type: Metric (MM)
• Weight: 0.24kg

Typical Applications

• Measuring shim thickness in gear assemblies
• Checking valve clearances in engine components
• Verifying shaft diameters in machining work
• Measuring bearing widths and thicknesses
• Checking the wall thickness of tubes or rods
• Quality control checks on machined parts

How to Use

• Zero Check: Close the anvil and spindle fully, then check that the thimble zero mark aligns with the zero line on the sleeve.

• Clean: Wipe the anvil and spindle faces with a clean, dry cloth before measuring.

• Position: Place the object between the anvil and spindle.

• Measure: Turn the thimble until the spindle contacts the object - apply consistent, light pressure.

• Lock: Tighten the lock screw to hold the spindle in position.

• Read: Note the main scale value on the sleeve, then add the thimble scale value to get the full measurement.

Frequently Asked Questions (FAQs)

• What is an outside micrometer used for?
  An outside micrometer measures the external dimensions of objects - typically thickness, outside diameter, or length. It is used in machining, manufacturing, and engineering to check that parts meet specified tolerances.

• What is the difference between an inside and an outside micro-meter?
  An outside micrometer measures external dimensions such as the diameter or thickness of a part. An inside micrometer measures internal dimensions - for example, the bore diameter of a hole or the inside width of a channel.

• How do you calibrate an outside micrometer?
  Close the anvil and spindle fully, then check that the thimble zero mark aligns with the zero line on the sleeve. If they do not align, insert the adjusting spanner into the sleeve and rotate until the lines match. Recheck after adjustment.

• How should an outside micrometer be stored?
  Store the instrument in a dry, clean area away from heat, humidity, and dust. Leave a small gap between the anvil and spindle during storage to account for thermal expansion of the metal parts.

• How often should a micro-meter be calibrated?
  Calibration frequency depends on how often the tool is used and the accuracy level your work requires. As a general rule, check the zero setting before each use. Carry out a full calibration check periodically, or after the tool has been dropped.

Summary

The Blue Spot Tools External Measuring Micro-meter 33921 reads external dimensions to 0.01mm resolution across a 0-25mm range. It includes an adjusting spanner and a lock screw, and is backed by a Lifetime Guarantee.