Mitutoyo 64AAA231 Thread Pitch Diameter Wire 8 Tpi

Product Description

The MITUTOYO 64AAA231 is a set of three thread pitch diameter measuring wires designed for precise internal thread measurement. These wires are used with thread plug gages to determine the pitch diameter of threaded bores using the three-wire measurement method. Each wire measures 2.25 inches in length with a nominal best wire diameter of 0.07217 inches, calibrated for 8 TPI threads with a 0.13-inch pitch. The nominal constant for this wire set is 0.1039 inches, which is applied directly in the standard pitch diameter calculation formula. Metrology technicians and quality control professionals rely on this tooling for traceable, repeatable thread inspection results.

This wire set is suited for use in manufacturing inspection environments, machine shops, and calibration labs where threaded component verification is required. The 8 TPI specification makes these wires appropriate for measuring coarser unified or standard pitch threads. They are intended for use alongside a thread plug gage and a micrometer capable of accepting wire setups. Both production floor inspection and incoming inspection applications are typical use cases.

Key Features

• Set of 3 wires sized for 8 TPI threads with 0.13-inch pitch
• Nominal best wire diameter of 0.07217 inches for accurate pitch diameter contact point
• Nominal constant of 0.1039 inches for direct use in pitch diameter calculations
• Wire length of 2.25 inches for handling ease during measurement setups
• Designed for use with thread plug gages in the three-wire measurement method

Compatibility

Designed for use with thread plug gages measuring 8 TPI threaded features using the standard three-wire pitch diameter measurement method.

Installation Notes

Thread measuring wires are a metrology consumable handled by quality technicians or machinists performing thread inspection. No power shutoff is required, but wires should be kept clean and free of burrs or contamination that could affect measurement accuracy. Handle wires carefully to avoid bending or surface damage, as deformation will compromise measurement results. Follow your applicable thread standard and micrometer manufacturer guidance when applying the nominal constant in pitch diameter calculations.