Mitutoyo 64AAA228 Thread Pitch Diameter Measuring Wire

Product Description

The MITUTOYO 64AAA228 is a thread pitch diameter measuring wire used to accurately measure thread pitch diameters using the three-wire method. Designed for 11 TPI threads with a 0.09 inch pitch, each wire measures 2.25 inches in length and has a nominal best wire diameter of 0.0525 inches. The set includes 3 wires, which is the standard quantity required for the three-wire measurement method. Machinists, tool and die makers, and quality control technicians use these wires with a micrometer to determine the pitch diameter of threaded fasteners and tapped holes to tight tolerances.

These measuring wires are suited for inspection and metrology work in machine shops, manufacturing facilities, and quality assurance environments. They are used when verifying thread pitch diameter on externally threaded parts such as bolts, studs, and threaded shafts with an 11 TPI thread form. The 3-wire method provides a highly accurate and repeatable measurement when combined with a calibrated outside micrometer and the appropriate constant value.

Key Features

• Designed for 11 TPI threads with a 0.09 inch pitch
• Nominal best wire diameter of 0.0525 inches for optimal contact angle accuracy
• Nominal constant of 0.0795 inches for direct pitch diameter calculation
• Each wire is 2.25 inches long for easy handling during measurement
• Set of 3 wires supports the standard three-wire measurement method

Compatibility

Designed for use with externally threaded workpieces at 11 TPI, compatible with the three-wire pitch diameter measurement method when used with a calibrated outside micrometer.

Installation Notes

These measuring wires are handled by machinists and metrology technicians and require no permanent installation. Before use, clean all contact surfaces on the micrometer and the workpiece thread to prevent measurement error. Handle wires carefully to avoid bending or surface damage, as deformation will affect accuracy. Store wires in their protective case when not in use to maintain calibration integrity.