Starrett 71976 Micrometer Rod 3 to 4 Inches

Product Description

The STARRETT 71976 is a replacement micrometer rod designed for use with 440 Series Micrometer Depth Gages. It extends the measurement range of the depth gage from 3 to 4 inches, allowing precise depth readings in that interval. The rod measures 4.0 inches in overall length with a rod diameter of 1/8 inch (3.20 mm). Machined to OEM dimensional tolerances, it maintains the accuracy and repeatability that depth gage work demands. Metrology technicians, machinists, and quality control personnel use this rod as a direct accessory swap when expanding or replacing worn depth gage rod sets.

This rod is intended for bench and floor-level inspection work where 440 Series Micrometer Depth Gages are already in service. Typical applications include checking bore depths, step heights, and slot depths on machined components in manufacturing and job-shop environments. The rod type anvil design suits precision measurement tasks where a small-diameter contact point is required to reach confined features.

Key Features

• Extends depth gage range from 3 to 4 inches
• Rod diameter of 1/8 inch (3.20 mm) for access to confined features
• 4.0 inch overall length for full range coverage
• Rod-type anvil design compatible with 440 Series gage bodies
• Lightweight at 0.1 pounds for easy bench handling

Compatibility

Designed for use with STARRETT 440 Series Micrometer Depth Gages as a direct accessory rod replacement or range extension.

Installation Notes

Installation of micrometer depth gage rods is performed by metrology technicians or machinists familiar with the 440 Series gage system. Before swapping rods, clean the gage spindle and rod seating surfaces to prevent contamination that could affect zero calibration. Follow the gage manufacturer's procedure for rod installation and verify zero after any rod change. No special tools are required beyond those supplied with the gage.