Starrett 71981 Micrometer Rod 8 to 9 Inches

Product Description

The STARRETT 71981 is a micrometer rod designed for use with 440 Series Micrometer Depth Gages. It extends the measurement range of compatible depth gages from 8 to 9 inches, allowing technicians and machinists to take accurate depth readings at greater reach. The rod measures 9.0 inches in overall length and has a diameter of 1/8 inch (3.20 mm). Precise rod dimensions ensure consistent fitment and repeatable readings. This rod is a direct accessory replacement or supplemental rod for professionals who need to expand the measurement capability of an existing 440 Series setup.

The 71981 rod is used in machining, metrology, and inspection environments where depth measurement beyond the base range of the depth gage is required. It is suited for shop floor use, quality control stations, and toolroom applications. Machinists, tool-and-die makers, and quality inspection technicians working with precision measurement equipment are the primary users. The rod integrates into the 440 Series Micrometer Depth Gage system without modification.

Key Features

• Extends 440 Series Micrometer Depth Gage measurement range to 9 inches
• Overall length of 9.0 inches for deep-reach measurement applications
• Rod diameter of 1/8 inch (3.20 mm) for precise gage interface fit
• Sold individually for single-rod replacement or range expansion

Compatibility

Designed for use with STARRETT 440 Series Micrometer Depth Gages. Covers the 8 to 9 inch measurement range within that series.

Installation Notes

Installation of micrometer rods is performed by qualified machinists or metrology technicians. Ensure the depth gage is removed from service and the spindle is fully retracted before swapping rods. Handle the rod carefully to avoid surface damage that could affect measurement accuracy. Verify rod seating and zero calibration before returning the gage to use.