Mitutoyo 167-158 Flat End Micrometer Extension Rod

Product Description

The MITUTOYO 167-158 is a flat end micrometer extension rod designed for use with outside micrometers requiring extended reach. At 18 inches in length, it allows measurements in deep bores, long shafts, or hard-to-access work areas where a standard micrometer frame cannot reach. The 167-158 delivers accuracy up to 0.00025 inches, maintaining the tight tolerances required in precision machining, inspection, and metrology environments. A heat insulating handle is included to minimize thermal expansion errors caused by hand contact during measurement. This extension rod is handled by machinists, quality control technicians, and tool and die professionals.

The 167-158 is used in precision measurement applications where outside micrometers must be extended to reach deep or elongated workpiece features. Common scenarios include measuring long cylindrical parts, extended shafts, and workpieces that exceed the direct reach of a standard micrometer anvil and spindle. The included heat insulating handle is particularly useful during extended measurement sessions on the shop floor or in temperature-controlled inspection rooms where thermal stability directly affects reading accuracy.

Key Features

• 18-inch extension length for deep or hard-to-reach measurement locations
• Flat end geometry for compatibility with outside micrometer setups
• Accuracy up to 0.00025 inches for high-precision measurement work
• Includes heat insulating handle to reduce thermal expansion error from hand contact
• Designed for use with outside micrometers

Compatibility

Designed for use with outside micrometers. Consult MITUTOYO documentation to confirm fitment with specific outside micrometer models before ordering.

Installation Notes

Extension rods of this type are installed by machinists or metrology technicians following the outside micrometer manufacturer's attachment procedure. Ensure the micrometer is zeroed and verified before attaching the extension rod. Handle the rod using the included heat insulating grip to avoid introducing thermal growth errors into measurements. Clean all mating surfaces before attachment to prevent measurement offset from debris or burrs.