Mitutoyo 64AAA227 Thread Pitch Diameter Measuring Wire

Product Description

The MITUTOYO 64AAA227 is a thread pitch diameter measuring wire designed for precise thread measurement using the three-wire method. This wire set enables machinists and metrologists to accurately determine the pitch diameter of external threads by measuring across three wires placed in thread grooves. The nominal best wire diameter is 0.0502 inches, calibrated for 11.5 TPI threads with a 0.087 inch pitch. Each wire is 2.25 inches long, providing sufficient length for stable seating during measurement. The nominal constant for this wire set is 0.0753 inches, used directly in pitch diameter calculations.

This wire set is suited for use in precision machining, quality control, and inspection environments where thread pitch diameter verification is required. The three-wire method is widely used in tool rooms, gage labs, and production floor inspection stations. These wires are appropriate for measuring unified, standard, or similarly pitched external threads at 11.5 TPI. The set includes 3 wires, allowing simultaneous placement across a thread for micrometer-based measurement.

Key Features

• Calibrated for 11.5 TPI threads with a 0.087 inch pitch
• Nominal best wire diameter of 0.0502 inches for accurate pitch diameter contact
• Nominal constant of 0.0753 inches for use in standard three-wire calculation formulas
• Wire length of 2.25 inches for stable seating and micrometer clearance
• Set of 3 wires supports simultaneous three-wire measurement method

Compatibility

Designed for use with external threads at 11.5 TPI and 0.087 inch pitch using the standard three-wire pitch diameter measurement method with a micrometer.

Installation Notes

Three-wire thread measurement is performed by qualified machinists, metrologists, or quality control technicians using a calibrated outside micrometer. Before use, clean the thread form and wires thoroughly to prevent measurement errors from debris or oil film. Handle wires carefully to avoid nicks or bends that would compromise measurement accuracy. Store wires in their protective case when not in use to maintain calibration integrity.