Outside - Interchangeable Anvils

Using interchangeable anvils allows a single micrometer to cover a much wider measuring range, typically in 25mm or 150mm increments. This versatility reduces the need for multiple tools, and HK Calibrations provides these sets to help Australian workshops streamline their precision measurement workflows cost-effectively.

To change the anvil, loosen the locking screw, slide out the current anvil, and insert the required size ensuring both slots align perfectly. HK Calibrations recommends cleaning the mounting surfaces before tightening to prevent measurement errors and maintaining NMI-traceable accuracy across your entire range.

Because each anvil change alters the zero point, you must use a setting standard (supplied with every set at HK Calibrations) to re-zero the instrument. This ensures that your measurements remain consistent and compliant with Australian ISO standards regardless of which anvil size is currently installed.

Yes, while flat anvils are standard for thickness, many sets at HK Calibrations include or support ball-end anvils specifically designed for rounded objects or tube walls. These specialized anvils provide a single tangential point of contact, preventing the measurement errors often caused by flat-to-curve misalignment.

For industrial use in Australia, HK Calibrations recommends professional calibration every 12 months to ensure continued precision and reliability. However, you should perform a manual zero-check using the provided setting bars every time you swap an anvil to maintain day-to-day measurement integrity.

Our range of outside micrometers features carbide-tipped measuring faces on both the spindle and interchangeable anvils to resist abrasion. This durable construction from HK Calibrations ensures that the flat and parallel surfaces stay true over time, providing longer tool life in harsh manufacturing environments.