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The MITUTOYO 983526 is a depth micrometer extension rod designed for use with Mitutoyo 138 and 329 series depth micrometers. The rod extends the measurement range of compatible depth mic sets to cover the 6 to 7 inch depth interval, with a maximum measurement capacity of 7.0000 inches. The rod diameter is 4.00 millimeters and the overall length is 256.70 millimeters (approximately 10.11 inches). Installation requires no special tooling beyond what is included with the base depth micrometer unit. Machinists, tool and die technicians, and precision measurement professionals use this rod to expand the measurement capability of their existing Mitutoyo depth mic sets.
This rod is suited for production floor, quality control, and toolroom environments where depth measurements in the 6 to 7 inch range are required. It is sold individually and is intended as an accessory to complement an existing Mitutoyo depth micrometer setup. The rod slots into the spindle of the compatible base unit to extend reach into deeper bores, slots, steps, and recesses.
Compatible with Mitutoyo 138 and 329 series depth micrometers as stated by the manufacturer.
Installation is performed by a machinist or metrology technician familiar with Mitutoyo depth micrometer systems. Before swapping rods, ensure the depth micrometer is clean and free of chips or debris at the spindle seating area. Follow the base unit manufacturer instructions for rod insertion and locking to ensure accurate, repeatable measurements. Handle the rod carefully to avoid nicks or surface damage that could affect measurement integrity.
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