Mitutoyo 129-112 Mechanical Depth Micrometer 150mm 6 Rod

Product Description

The MITUTOYO 129-112 is a mechanical depth micrometer designed for precision depth measurement in machining, toolmaking, and metrology applications. It features a ratchet stop thimble that delivers consistent measuring force across repeated measurements, reducing operator-induced error. The 6-rod set extends the measuring range to 150 mm, with a 4 mm rod diameter and rotating rod design for quick changeovers. Accuracy is rated at 3 micrometers, and the base length is 63.5 mm. The satin chrome finish reduces glare under shop lighting and resists corrosion. A measuring rod lock holds the reading for transfer to a reference surface or written record. This instrument is typically used by machinists, quality control technicians, and tool-and-die professionals who need reliable, repeatable depth readings.

The 129-112 suits precision shop floor and inspection room use where manual depth gauging is required on bores, slots, steps, and counterbores. The 63.5 mm base provides a stable reference surface on flat workpieces. The 6-rod set covers the full 0 to 150 mm range in 25 mm increments, making it appropriate for a wide range of workpiece geometries in both light manufacturing and high-precision toolroom environments. The fitted plastic case keeps all rods organized and protected during storage and transport.

Key Features

• Ratchet stop thimble ensures constant measuring force for repeatable results
• 6 interchangeable rods cover 0 to 150 mm measuring range
• Measuring rod lock retains reading after gauge is lifted from workpiece
• 63.5 mm base length provides stable contact on flat reference surfaces
• Hardened steel measuring faces resist wear under regular production use
• Satin chrome finish minimizes glare and provides corrosion resistance
• Includes fitted plastic case for organized rod storage and instrument protection

Compatibility

Designed as a standard mechanical depth micrometer for general precision measurement use. Compatible with common depth micrometer accessories and rod sets that conform to the 4 mm rod diameter specification.

Installation Notes

Depth micrometers are used by machinists and metrology technicians and require no installation in a mechanical system. Before use, verify the instrument reads zero with the base seated on a flat reference surface and all rods fully retracted. Select the correct rod for the intended depth range and lock it securely before measuring. Store rods in the fitted case when not in use to prevent damage to measuring faces.