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Basic 60 Thread Measuring Wire Information

PITCH DIAMETER = MEASUREMENT OVER WIRES (MOW) - CONSTANT

w = Wire Size

P =Pitch = 1 / # of Threads per Inch = The distance the Thread travels in one turn.

C = Constant = 3w - .86602540P

PD = Pitch Diameter = the halfway point between Sharp Major & Minor Diameters.

Measured PD = MOW - (3w - .86602540P)

Reference ANSI / ASME Standards:

B89.1.17 - 2001 "Measurement of Thread Measuring Wires"

B1.7M - 1984 "Nomenclature, Definitions, & Letter Symbols for Screw Threads"

B1.1 - 2003 "Unified Inch Screw Threads (UN & UNR Thread Form) "

B1.2 - 1983 "Gages & Gaging for Unified Inch Screw Threads"

B1.13M - 2001 "Metric Screw Threads: M Profile"

B1.16M - 1984 "Gages & Gaging for Metric M Screw Threads"