Mitutoyo 103-221CAL Outside Micrometer 7 in Nist Cal

Product Description

The MITUTOYO 103-221CAL is a mechanical outside micrometer designed for high-precision linear measurement in professional machining, metrology, and quality-control environments. It covers a 7-inch measurement range with a graduation of 0.0001 inches and an accuracy of plus or minus 0.0002 inches. The spindle and anvil measuring faces are solid carbide for durability and resistance to wear. A ratchet stop thimble provides consistent measuring force, reducing operator-to-operator variation. A rotating spindle allows easy part loading. This instrument ships with a NIST traceability calibration certification, making it ready for documented quality processes without additional calibration steps.

The 103-221CAL is suited for precision measurement of large-diameter workpieces in manufacturing, tool-and-die, and inspection applications. The 7-inch range accommodates shafts, bores measured externally, and other large components common in heavy machining and industrial fabrication shops. The included plastic case protects the instrument during storage and transport between work cells or job sites. Licensed metrologists, machinists, and quality technicians are the primary users of this instrument.

Key Features

• 7-inch maximum measurement range with 0.0001-inch graduation for fine resolution
• Accuracy of plus or minus 0.0002 inches
• Solid carbide anvil and spindle measuring faces for extended wear life
• Ratchet stop thimble delivers repeatable, consistent measuring force
• Rotating spindle for easier workpiece positioning
• NIST traceability calibration certification included out of the box
• Satin chrome finish reduces glare and surface corrosion

Compatibility

Designed as a standard outside micrometer for use with workpieces up to 7 inches in diameter or thickness; compatible with standard micrometer standards and setting rods appropriate for the 6-to-7-inch range.

Installation Notes

Outside micrometers require no installation in the traditional sense, but proper setup is essential for accurate readings. Before use, verify the zero calibration against a certified setting standard appropriate for the 6-to-7-inch range. Store the instrument with the anvil and spindle faces slightly separated to prevent thermal stress. Cleaning the measuring faces with a lint-free cloth before each use removes debris that can affect accuracy.