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Measuring & Inspection

Measuring & Inspection

Calipers, micrometers, indicators, gauge blocks and squares.

Also searched as: calipersmicrometerdial indicatorfeeler gaugeheight gauge

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About measuring & inspection

Measuring and inspection tools are essential for verifying dimensional accuracy and ensuring quality control in manufacturing and assembly processes. This category encompasses a range of precision instruments designed for various measurement tasks. Calipers, including vernier, dial, and digital types, are used for external, internal, depth, and step measurements, typically with resolutions down to 0.01mm or 0.0005 inches and measuring ranges from 0-150mm to 0-1000mm. Micrometers, such as outside, inside, and depth micrometers, offer higher precision, often to 0.001mm or 0.00005 inches, with standard ranges in 25mm or 1-inch increments. Dial indicators and digital indicators measure small linear distances or variations, commonly employed with stands or fixtures to check runout, flatness, or parallelism, with travel ranges from a few millimeters to 50mm. Gauge blocks, manufactured to grades like 0, 1, or 2, provide highly accurate reference lengths for calibrating other instruments or setting up machines. Squares, including try squares and engineer's squares, are used to verify perpendicularity. Common materials for these tools include hardened stainless steel, tool steel, and carbide for wear surfaces, often with satin chrome finishes for readability or corrosion resistance.

How to choose

When selecting measuring and inspection tools, first determine the required measurement type: length, depth, internal diameter, or angularity. Second, specify the necessary precision and resolution; micrometers offer higher precision than calipers, while indicators are for comparative measurements. Third, consider the measurement range; a 0-150mm caliper suits most small parts, but larger components require extended ranges. Fourth, evaluate the operating environment: digital tools offer convenience but may be sensitive to coolant or debris, whereas mechanical tools are often more robust. Finally, assess the required accuracy and traceability; gauge blocks provide master references, and instruments should be selected based on their calibration standards and certification.