Mitutoyo 129-115 Mechanical Depth Micrometer 100mm 4 Rod

Product Description

The MITUTOYO 129-115 is a mechanical depth micrometer designed for precise depth measurement in metalworking, machining, and inspection applications. It features a ratchet stop thimble that delivers consistent measuring force on every use, reducing operator variability. The instrument covers a maximum measurement range of 100 mm using four interchangeable rotating rods, each with a 4 mm diameter. Graduation reads to 0.01 mm metric and 0.0001 inch imperial, with an accuracy of 3 micrometers. The hardened steel measuring faces resist wear under repeated production use. A satin chrome finish reduces glare under shop lighting. A measuring rod lock secures the selected rod during setup and transfer.

The 129-115 is suited for use in precision machining shops, tool rooms, quality control departments, and production inspection environments. It is commonly used to measure the depth of bores, slots, shoulders, and counterbores. The 101.6 mm base length provides stable seating across wider workpieces. Licensed machinists, quality inspectors, and toolmakers are the primary users. The instrument ships in a fitted plastic case, making it appropriate for both bench use and field inspection work where protection during transport is needed.

Key Features

• 100 mm maximum measurement range using 4 interchangeable rotating rods
• Ratchet stop thimble ensures constant, repeatable measuring force
• Metric graduation of 0.01 mm and inch graduation of 0.0001 inch
• Accuracy of 3 micrometers for high-precision inspection use
• Hardened steel measuring faces for long-term wear resistance
• Measuring rod lock holds position during reading and transfer
• Includes fitted plastic storage and transport case

Compatibility

Designed as a standard mechanical depth micrometer suitable for general-purpose depth measurement on metal, machined, and inspected workpieces requiring metric and inch dual-graduation capability.

Installation Notes

Installation and use is performed by machinists, quality inspectors, or toolmakers familiar with precision hand tools. Before measuring, ensure the base reference surface and workpiece are clean and free of burrs or chips that could affect seating. Use the ratchet stop thimble consistently to maintain uniform measuring force and avoid over-tightening. Store the instrument in its fitted case when not in use to protect the measuring faces and graduated surfaces.