Mitutoyo 64AAA217 Thread Pitch Diameter Measuring Wire

Product Description

The MITUTOYO 64AAA217 is a thread pitch diameter measuring wire used to precisely determine the pitch diameter of threaded fasteners and gages. Designed for 27 TPI threads with a 0.04 inch pitch, this wire has a nominal best wire diameter of 0.02138 inches and a nominal constant of 0.0295 inches. Each wire measures 1.125 inches in length. The set includes 2 pieces. Machinists, tool and die makers, and quality control technicians use these wires with a micrometer and the three-wire method to achieve accurate pitch diameter measurements on threaded components.

This measuring wire is intended for use with thread plug gages and related threadform inspection tasks. The three-wire method is a standard technique in precision machining environments where direct pitch diameter measurement is required for compliance with thread standards. These wires are suited for shop floor and inspection room use wherever 27 TPI unified or similar thread forms must be verified to close tolerances.

Key Features

• 27 TPI thread compatibility with 0.04 inch pitch
• Nominal best wire diameter of 0.02138 inches for accurate three-wire calculations
• Nominal constant of 0.0295 inches simplifies micrometer reading conversion
• Wire length of 1.125 inches provides adequate handling for gage setups
• Set of 2 wires included for standard three-wire method application
• Designed for use with thread plug gages

Compatibility

Designed for use with thread plug gages for pitch diameter measurement of 27 TPI threaded components using the three-wire method.

Installation Notes

Thread measuring wires are used by machinists and quality technicians and require no permanent installation. Place wires in the thread grooves and use a calibrated micrometer to take the measurement across the wires, then apply the nominal constant to determine pitch diameter. Handle wires carefully to avoid nicks or deformation that would affect measurement accuracy. Store wires in their original container when not in use to maintain surface condition.