Starrett 71990 Micrometer Rod 8-9 in Depth Gage

Product Description

The STARRETT 71990 is a replacement micrometer rod designed for use with 443 and 445 Series Micrometer Depth Gages. It extends the measurement range of those gages from 8 to 9 inches, allowing depth measurements in that interval without replacing the full gage assembly. The rod has a diameter of 5/32 inch (3.20 mm) and an anvil-style rod tip. Machinists, tool and die technicians, and quality control professionals install this rod when servicing or expanding the capacity of a compatible depth gage. It ships individually and is a direct OEM-style accessory from Starrett.

This rod is suited for precision depth measurement applications in machine shops, manufacturing floors, and metrology environments. It is used wherever a 443 or 445 Series Micrometer Depth Gage is in service and the operator requires depth readings in the 8 to 9 inch range. The rod swaps into the gage spindle assembly to replace a worn rod or to reach depths beyond the standard included rod set.

Key Features

• Extends depth gage measurement range to cover 8 to 9 inches
• Rod diameter of 5/32 inch (3.20 mm) matches OEM specification
• Rod-type anvil design for point contact at the bottom of bores and slots
• Direct accessory fit for STARRETT 443 and 445 Series Micrometer Depth Gages
• Sold individually, no additional hardware required

Compatibility

Designed for use with STARRETT 443 and 445 Series Micrometer Depth Gages. No other compatible models are specified by the manufacturer for this rod.

Installation Notes

Rod replacement is performed by machinists or metrology technicians familiar with depth gage disassembly. Before swapping the rod, ensure the gage is clean and free of chips or coolant residue that could affect the spindle fit. Follow the gage manufacturer's service instructions for rod insertion and locking to maintain measurement accuracy. Do not force the rod into the spindle; proper seating requires only hand pressure.