Technical Data:
Product type: 3-Wire Thread Measuring System
Application: Fast and accurate external thread measurement with a micrometer
Wire assembly: Wire holders and 3 thread-measuring wires assembled for each thread pitch
Measurement relations:
PD = Pitch Diameter
M = Measurement over wires
W = Wire diameter
C = Constant
C = 0.86603 x Pitch (inches) - 3W
PD = M - C
W = 0.57735 x P

Application:
Measure set thread plug gages and working thread plug gages
Monitor wear on working thread plug gages
Monitor and control pitch-diameter variation during thread fabrication
Reduce measurement time compared with traditional three-wire method
Use with Go/No-go thread ring gages to control thread size
Determine thread out-of-roundness and taper
Pre-plating and post-plating thread measurement

Technical Data:
Wire diameter tolerance: +/-0.000010 in
Wire roundness tolerance: +/-0.000010 in
Surface finish: 2 micro inches AA, lapped
Hardness: HRC 59 - 64
Certification of accuracy included
Traceable to NIST
Meets or exceeds applicable ANSI and ISO specifications
Thread per inch: 5
Thread measuring wire diameter: .11547 in
Holder spindle diameter: 8 mm
Order-number suffix: H8