Spi 10-733-4 Mechanical Hole Micrometer 1.200-1.400 in

Product Description

The SPI 10-733-4 is a mechanical hole micrometer designed for precision internal bore measurement across a range of 1.200 to 1.400 inches. It features a 3-point contact system with solid carbide measuring anvils that self-align and self-center within the bore, eliminating the need for manual rocking to find true diameter. Graduation is 0.0002 inches with a rated accuracy of 0.0002 inches. A ratchet stop thimble provides consistent measuring force for repeatable readings. This tool is well suited to machine shops, maintenance facilities, and precision manufacturing environments where accurate bore gauging is required.

The 10-733-4 is used for measuring internal diameters in the 1.200 to 1.400 inch range, typical in applications such as engine bore inspection, bearing housing measurement, and precision bore qualification in both production and maintenance settings. The carbide anvil faces provide durability against wear in repetitive measurement cycles. The instrument reaches a gage depth of 3.150 inches, making it useful for measuring bores that extend beyond the surface. Machinists, toolmakers, and quality control technicians are the primary users of this instrument.

Key Features

• Measurement range: 1.200 to 1.400 inches
• Graduation of 0.0002 inches with accuracy rated at 0.0002 inches
• 3-point contact design provides self-aligning and self-centering measurement
• Solid carbide measuring anvils for extended wear resistance
• Ratchet stop thimble ensures consistent, repeatable measuring force
• Gage depth of 3.150 inches for access to deeper bores

Compatibility

Designed as a direct-use hole micrometer for internal bore measurement applications requiring a 1.200 to 1.400 inch range with 3-point carbide contact.

Installation Notes

This instrument is a handheld precision measuring tool and does not require installation. Prior to use, verify calibration against a known standard and ensure the measuring faces are clean and free of debris. Store in the provided case when not in use to protect the carbide anvils and maintain calibration integrity. Handle with care to avoid dropping, which can affect accuracy.