Starrett 71977 Micrometer Depth Gage Rod 4 to 5 in

Product Description

The STARRETT 71977 is a replacement micrometer rod designed for use with 440 Series Micrometer Depth Gages. It extends the measurement range of the depth gage from 4 to 5 inches, allowing technicians and machinists to take accurate depth measurements at the upper end of that range. The rod measures 5.0 inches in overall length with a rod diameter of 1/8 inch (3.20 mm). It is an accessory-grade component intended for precision measurement work in tool rooms, machine shops, and field service environments where depth gage versatility is required.

This rod is used wherever a 440 Series Micrometer Depth Gage needs to be configured for the 4 to 5 inch measurement range. Typical applications include measuring bore depths, slot depths, and step heights on machined parts. Machinists, tool and die makers, and quality control technicians working in manufacturing or maintenance settings will find this rod a straightforward swap-in when reconfiguring a 440 Series depth gage for different measurement tasks.

Key Features

• Extends 440 Series Micrometer Depth Gage range to the 4 to 5 inch interval
• Overall length of 5.0 inches for accurate depth measurement at range limit
• Rod diameter of 1/8 inch (3.20 mm) for compatibility with 440 Series gage bodies
• Lightweight at 0.1 pounds, suited for portable toolbox storage
• Sold individually — package quantity of 1

Compatibility

Designed for use with STARRETT 440 Series Micrometer Depth Gages as a range-extension rod accessory for the 4 to 5 inch measurement interval.

Installation Notes

Installation of the rod is performed by a machinist or technician familiar with micrometer depth gage assembly. Before swapping rods, ensure the gage spindle is fully retracted and the gage is not under load. Follow the gage manufacturer's instructions for rod seating and lock-down to maintain measurement accuracy. Verify zero calibration after any rod change before taking measurements.