Mitutoyo 64AAA216 Thread Pitch Diameter Measuring Wire

Product Description

The MITUTOYO 64AAA216 is a thread pitch diameter measuring wire designed for precise thread measurement in metrology and machining applications. Built for 28 TPI threads with a 0.04 inch pitch, this wire measures 1.125 inches in length and has a nominal best wire diameter of 0.02062 inches. Each set contains 3 pieces, which is the standard quantity required for the three-wire method of measuring thread pitch diameter. Licensed machinists, quality control technicians, and toolroom professionals use these wires with a micrometer to determine the pitch diameter of threaded components to a high degree of accuracy.

The 64AAA216 is suited for use in precision measurement environments including manufacturing shops, inspection labs, and toolrooms. It is specifically intended for use with thread plug gages where accurate pitch diameter verification is required. The three-wire method, for which this set is designed, is a widely accepted technique for measuring external threads. This wire set targets 28 TPI unified or similar thread forms where the 0.04 inch pitch corresponds to the applicable thread standard.

Key Features

• 28 TPI thread measurement — 0.04 inch pitch for correct wire-to-thread engagement
• Nominal best wire diameter of 0.02062 inches ensures accurate pitch diameter readings
• Nominal constant of 0.0272 inches simplifies micrometer reading conversion
• Wire length of 1.125 inches provides adequate handling length during measurement
• Set of 3 wires — complete quantity for the standard three-wire measurement method
• Designed for use with thread plug gages in precision inspection setups

Compatibility

Designed for use with thread plug gages and external thread measurement applications requiring 28 TPI pitch diameter verification using the three-wire method.

Installation Notes

Thread measuring wires are used by machinists and quality control technicians as part of a bench measurement procedure — no installation in the traditional sense is required. Handle wires carefully to avoid nicks or bends that would compromise measurement accuracy. Store wires in their protective case when not in use to prevent damage. Apply wires in sets of three across the thread flanks and measure with a calibrated micrometer, then apply the nominal constant to calculate pitch diameter.