Mitutoyo 64AAA215 Thread Pitch Diameter Measuring Wire

Product Description

The MITUTOYO 64AAA215 is a thread pitch diameter measuring wire used to accurately determine the pitch diameter of threaded fasteners and tapped holes. This set includes 3 precision-ground wires, each 1.125 inches long, with a nominal best wire diameter of 0.0193 inches and a nominal constant of 0.0318 inches. Designed for 30 TPI threads with a 0.03 inch pitch, these wires are used in conjunction with a micrometer following the three-wire measurement method. Machinists, tool and die makers, and quality control technicians rely on this method for traceable, high-accuracy pitch diameter verification on inch-series threads.

These measuring wires are suited for inspection and quality assurance work in machine shops, manufacturing facilities, and metrology labs. The three-wire method using wires like the 64AAA215 is a standard practice when verifying thread pitch diameter to print tolerances on external threads. The 0.03 inch pitch specification corresponds to 30 TPI unified or similar inch-series thread forms. Each wire in the set is matched to the same nominal diameter, ensuring consistent seating across all three contact points during measurement.

Key Features

• Nominal best wire diameter of 0.0193 inches optimized for 30 TPI thread measurement
• Nominal constant of 0.0318 inches for direct use in three-wire pitch diameter calculations
• Wire length of 1.125 inches provides adequate contact surface for stable micrometer readings
• Set of 3 wires enables simultaneous placement for the standard three-wire measurement method
• Manufactured by MITUTOYO to metrology-grade tolerances for repeatable, accurate results

Compatibility

Designed for use with 30 TPI inch-series external threads having a 0.03 inch pitch. Intended for use with outside micrometers as part of the three-wire pitch diameter measurement method.

Installation Notes

Thread measuring wires are a hand-measurement tool and do not require installation into a system. Wires should be handled carefully to avoid nicks or surface damage that would affect measurement accuracy. Clean wires and the micrometer anvil faces before use. Apply consistent, light measuring force to avoid wire deformation or false readings.