Spi 10-713-6 Mechanical Hole Micrometer 0.425-0.500 in

Product Description

The SPI 10-713-6 is a mechanical inside hole micrometer designed for precision internal bore measurement in the 0.4250 to 0.5000 inch range. Built with solid carbide measuring anvils, it delivers an accuracy of 0.000200 inches and a graduation of 0.0001 inches, making it suitable for tight-tolerance inspection work. The ratchet stop thimble provides consistent measuring force to reduce operator-to-operator variation. This tool is used by machinists, quality control technicians, and precision toolroom professionals who require reliable, repeatable bore measurement without the complexity of a digital readout.

The 10-713-6 is well suited for inspecting small-diameter bored holes, bushings, and precision-machined bores in manufacturing and machine shop environments. With a gage depth of 2.0000 inches and a maximum extension rod length of 4.0000 inches, it can reach into moderately deep features. The three-point contact design is self-aligning and self-centering, which simplifies setup and reduces the chance of a cocked or misread measurement. It is appropriate for both production floor use and toolroom inspection.

Key Features

• Measurement range of 0.4250 to 0.5000 inches for small-bore inspection
• Solid carbide measuring anvils for durability and wear resistance
• Ratchet stop thimble ensures consistent, repeatable measuring force
• Self-aligning and self-centering three-point contact design
• Graduation of 0.0001 inches with 0.000200 inch accuracy
• Gage depth of 2.0000 inches for moderate-depth bore access

Compatibility

Designed as a standard mechanical hole micrometer suitable for use with compatible setting rings and extension rods meeting industry-standard dimensions for this bore range.

Installation Notes

This instrument is installed and operated by machinists or quality technicians — no power source is required. Before use, verify calibration against a certified setting ring of the appropriate diameter. Keep measuring faces clean and free of chips or coolant residue, as contamination will affect accuracy. Store in the provided case when not in use to protect the carbide anvils from damage.