Mitutoyo 64AAA229 Thread Pitch Diameter Measuring Wire

Product Description

The MITUTOYO 64AAA229 is a thread pitch diameter measuring wire designed for precise thread measurement in metrology and quality-control applications. Sized for 10 TPI (threads per inch) with a 0.1-inch pitch, this wire features a nominal best wire diameter of 0.0577 inches and a nominal constant of 0.0866 inches. At 2.25 inches in length, it fits standard thread-measuring setups and is used with a micrometer to calculate the pitch diameter of external threads. Machinists, toolroom technicians, and quality inspectors rely on this type of wire for accurate verification of threaded components to specification.

This measuring wire is intended for use with thread plug gages and external thread inspection in shop-floor and laboratory environments. It is suited for applications where thread pitch diameter must be verified against a known standard, including fastener manufacturing, precision machining, and tooling inspection. The 10 TPI designation makes it appropriate for coarse-pitch inch-series threads commonly found in industrial and mechanical fastener applications. Each package contains 3 wires, providing redundancy during measurement sessions and allowing for the three-wire measuring method.

Key Features

• 10 TPI thread pitch rating with 0.1-inch pitch for accurate coarse-thread measurement
• Nominal best wire diameter of 0.0577 inches ensures proper contact at thread flanks
• Nominal constant of 0.0866 inches supports direct pitch diameter calculation
• Wire length of 2.25 inches accommodates standard bench micrometer setups
• For use with thread plug gages in shop or laboratory inspection environments
• Sold as a set of 3 wires, enabling the standard three-wire measurement method

Compatibility

Designed for use with thread plug gages and bench micrometers in applications requiring pitch diameter measurement of 10 TPI inch-series external threads.

Installation Notes

Thread measuring wires are handled and positioned by quality technicians or machinists trained in metrology procedures. Clean the wire and thread surfaces before measurement to prevent debris from affecting readings. Wires should be held in the thread grooves while a micrometer reading is taken, then the pitch diameter is calculated using the nominal constant. Store wires in their case when not in use to prevent deformation or surface damage that would compromise measurement accuracy.