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Mitutoyo 3-Wire Units – Series 313 are precise micrometer accessories used for providing precise pitch diameter measurements of screw threads. Made by Mitutoyo and distributed by Bombay Tools Supplying Agency Private Limited, these tools provide high-precision results in thread inspection and dimensional metrology.

What is a 3-Wire Unit?

A 3-wire unit is a micrometer attachment that allows measurement of the pitch diameter of external threads with high accuracy. It does so by inserting calibrated wires in contact with the threads and the measuring faces of the micrometer, providing good contact and reliable results. The process is commonly applied in quality control, manufacturing, and machining.

• Measuring Threads with Precision: Provides reliable pitch diameter readings with respect to metric, unified (threads per inch), and Whitworth thread standards.
  
• Broad Wire Size Range: Accommodates wire diameters between 0.170 mm and 3.200 mm for different types of threads and pitches.
• High Accuracy: ±0.002 mm wire diameter precision guarantees predictable and repeatable results.
• Robust Construction: Constructed from high-quality materials to maintain durability against frequent industrial use.
• Compatible Design: Mounts perfectly onto micrometer spindle and anvil measuring surfaces.
• Flexible Application: Easy to use in tool rooms, inspection laboratories, and production areas.
• Complete Set Available: No. 313-101 is available as a whole 3-wire unit set for optimal flexibility.