Mitutoyo 64AAA222 Thread Measuring Wire 18 Tpi 2.25 in

Product Description

The MITUTOYO 64AAA222 is a thread pitch diameter measuring wire used to determine the pitch diameter of threaded fasteners and gauges with precision hand measurement tools. Designed for 18 TPI threads with a 0.06 inch pitch, this wire has a nominal best wire diameter of 0.032 inches and a nominal constant of 0.0443 inches. Each wire measures 2.25 inches in length. The set includes 3 wires, providing enough redundancy for consistent three-wire thread measurement setups. Machinists, tool and die technicians, and quality control inspectors use these wires with micrometers to obtain accurate pitch diameter readings on threaded parts.

Thread pitch diameter measuring wires are used in precision metrology applications where direct pitch diameter measurement is required. This set is suited for use with thread plug gauges and standard bench micrometers in inspection rooms, machine shops, and manufacturing environments. The 18 TPI specification makes this set appropriate for unified coarse and fine thread series fasteners and threaded components commonly found in general mechanical and industrial assemblies. The 3-wire measurement method using sets like this is a widely accepted technique for traceable dimensional inspection.

Key Features

• Nominal best wire diameter of 0.032 inches optimized for accurate 18 TPI pitch diameter measurement
• Nominal constant of 0.0443 inches for direct use in standard three-wire measurement calculations
• Wire length of 2.25 inches provides sufficient working length for stable micrometer contact
• Set of 3 wires supports the standard three-wire method for pitch diameter determination
• Compatible with thread plug gauge measurement applications

Compatibility

Designed for use with thread plug gauges and bench micrometers for three-wire pitch diameter measurement of 18 TPI threaded parts.

Installation Notes

Thread measuring wires are handled and applied by machinists or metrology technicians in a controlled inspection environment. No power tools or electrical shutoff procedures are required. Handle wires carefully to avoid nicking or bending, as surface damage will affect measurement accuracy. Follow the three-wire measurement method and apply the nominal constant provided to calculate actual pitch diameter from micrometer readings.