Mitutoyo 521-103 | Dial Indicator | Calibration Tester | Series 521 | Metric | Graduation 0.2 µm | Range 0 to 1 mm | Mass 7 kg
Part No. 521-103 | Range 0–1 mm | Graduation 0.0002 mm | Accuracy ±0.2 µm
Product Overview
The Mitutoyo 521-103 is a Series 521 calibration tester designed for checking short-range dial indicators, dial test indicators and electronic comparison gauge heads in-house. It provides a 0–1 mm measuring range with 0.0002 mm (0.2 µm) graduation and ±0.2 µm accuracy, allowing indicator readings to be compared against a controlled reference.
The tester uses a precision spindle arrangement to apply known displacement to the indicator under test. An indicator is secured in the universal bracket, brought into contact with the carbide-tipped measuring face, and advanced through the required measuring range. The tester reading can then be compared with the indicator indication at defined points.
The universal clamping arrangement accepts stems from Ø4 mm to Ø10 mm. This makes the 521-103 suitable for checking a range of commonly used dial and test indicators without requiring an additional bracket for these stem sizes.
Dual colour-indexed graduation markings help identify the measuring direction during verification. The carbide-tipped measuring face provides a wear-resistant contact surface for repeated checking, while the supplied wooden case provides storage and protection when the tester is not in use.
For applications requiring a longer measuring range, the Mitutoyo 521-105 provides a 0–5 mm range.
Key Benefits
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In-house indicator verification across a 0–1 mm range.
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±0.2 µm specified accuracy with 0.0002 mm graduation.
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Universal clamping range for Ø4–10 mm indicator stems.
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Suitable for dial indicators, dial test indicators and electronic comparison gauge heads.
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Dual colour-indexed graduations help identify measuring direction.
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Carbide-tipped measuring face for repeated contact.
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Supplied in a wooden case for storage and transport.
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Useful for intermediate checks between formal calibration activities.
Who This Product Is Best For
The Mitutoyo 521-103 is suited to quality-control departments, inspection teams, metrology laboratories, machine shops and maintenance departments that regularly use short-range indicators.
It can be useful where indicators need to be checked after accidental impact, before a critical inspection task, during troubleshooting, or according to an organisation's documented equipment-verification procedure.
For laboratories and organisations operating under quality systems such as ISO 9001 or ISO/IEC 17025, the tester can form part of an established measurement-equipment verification process. The appropriate checking frequency should be determined by the organisation's procedures, equipment use and required measurement confidence.
How to Use
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Secure the indicator under test in the universal bracket and position its contact point against the tester spindle.
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Set the tester and indicator to their required reference or zero position.
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Advance the tester through selected points within the 0–1 mm range.
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Record the indicator reading at each reference position.
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Repeat measurements in the required directions to evaluate indication behaviour and hysteresis.
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Compare the observed readings with the indicator's specified tolerance and your applicable inspection procedure.
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Record the verification results according to your quality or calibration documentation requirements.
The 521-103 should be used with suitable reference procedures and environmental conditions for the accuracy required by the application.
Frequently Asked Questions
What does the Mitutoyo 521-103 calibrate?
The 521-103 is designed for checking short-range dial indicators, dial test indicators and electronic comparison gauge heads.
What is the measuring range of the Mitutoyo 521-103?
The measuring range is 0–1 mm.
How accurate is the Mitutoyo 521-103?
The specified accuracy is ±0.2 µm, with a graduation of 0.0002 mm (0.2 µm).
What indicator stems does the 521-103 accept?
Its universal clamping arrangement accepts indicator stems from Ø4 mm to Ø10 mm.
What is the difference between the 521-103 and 521-105?
The 521-103 has a 0–1 mm measuring range, while the 521-105 provides a longer 0–5 mm range. Select the tester according to the measurement range required for the indicators being checked.
How often should an indicator be checked?
The interval depends on the instrument, application, environmental conditions and your documented quality procedure. Additional checks may be appropriate after an impact, suspected damage or before critical measurement work.
How do I buy the Mitutoyo 521-103 in Saudi Arabia?
Contact General Tech Services in Dammam at +966 53 132 1586 or email mathews@generaltechsaudi.com to request current pricing and availability.
