Mitutoyo 64AAA220 Thread Measuring Wire 22 Tpi 0.05 in

Product Description

The MITUTOYO 64AAA220 is a precision thread pitch diameter measuring wire used with a micrometer to determine the pitch diameter of external threads. The wire is designed for 22 TPI threads with a 0.05 inch pitch. It has a nominal best wire diameter of 0.0262 inches and a nominal constant of 0.0354 inches. Each set contains 3 pieces and is 2.25 inches long. Machinists, tool-and-die makers, and quality control technicians use this wire when verifying thread geometry to tight tolerance standards during inspection or production.

This measuring wire is suited for shop-floor and inspection-room use wherever external thread pitch diameter must be verified against a print specification. It is most commonly used with a bench micrometer or a standard outside micrometer equipped for three-wire measurement. Applications include general machining, toolroom work, and incoming or in-process inspection of threaded fasteners and precision components.

Key Features

• Designed for 22 TPI threads with a 0.05 inch pitch
• Nominal best wire diameter of 0.0262 inches for accurate pitch diameter calculation
• Nominal constant of 0.0354 inches simplifies micrometer reading conversion
• 2.25 inch wire length provides adequate contact area for stable measurement
• Set of 3 wires supports the standard three-wire measurement method

Compatibility

Designed for use in three-wire thread measurement of external threads at 22 TPI with a 0.05 inch pitch, compatible with standard bench and outside micrometers used for thread pitch diameter inspection.

Installation Notes

Thread measuring wires are used by machinists and quality technicians and require no permanent installation. Handle wires carefully to avoid nicks or bends that would affect measurement accuracy. Keep wires clean and stored in their protective case when not in use. Follow the wire manufacturer or gauge block supplier documentation for the correct three-wire measurement formula applicable to the thread form being inspected.