Spi 10-741-7 Mechanical Hole Micrometer 1.6-2.0 in

Product Description

The SPI 10-741-7 is a mechanical hole micrometer designed to measure internal bore diameters from 1.6000 to 2.0000 inches with a graduation of 0.0002 inches and an accuracy of 0.000250 inches. It uses a three-point contact design with solid carbide measuring anvils for consistent, wear-resistant contact against the bore wall. The ratchet stop thimble controls measuring force to reduce operator influence on readings. This instrument is suited for machinists, tool and die makers, quality control technicians, and precision measurement professionals working in manufacturing, maintenance, or inspection environments.

The 10-741-7 is used to measure internal diameters in bores, holes, and cylindrical features that fall within the 1.6000 to 2.0000 inch measurement range. Its self-aligning and self-centering contact point geometry makes it practical for blind bores and through-holes where consistent positioning is critical. A maximum extension rod length of 6.0000 inches allows measurement at depth. The gage depth reaches 3.5400 inches, making it suitable for deeper bore inspection tasks in both production and maintenance settings.

Key Features

• Measurement range from 1.6000 to 2.0000 inches with 0.0002 inch graduation
• Accuracy of 0.000250 inches for high-precision internal bore measurement
• Solid carbide measuring anvils for durability and wear resistance
• Three-point contact design that is self-aligning and self-centering in the bore
• Ratchet stop thimble controls applied measuring force for repeatable readings
• Maximum extension rod length of 6.0000 inches for deep-bore access

Compatibility

Designed as a direct-use mechanical hole micrometer for internal bore inspection tasks requiring measurement within the 1.6000 to 2.0000 inch range. The 2.0000 inch setting ring diameter aligns with standard bore gage setup procedures.

Installation Notes

This instrument is used by machinists and quality control technicians and does not require installation in a fixed system. Before use, zero and calibrate the micrometer per the manufacturer procedure using an appropriate setting standard. Handle carbide anvils carefully to avoid chipping from impact. Store in a protective case away from temperature extremes and contaminants that could affect calibration.